National Atmospheric Deposition Program 2000 Annual Summary

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					National Atmospheric Deposition Program
2000 Annual Summary




 1986 - 1990                              1986 - 1990




 1996 - 2000                              1996 - 2000



      Inorganic Nitrogen Wet Deposition           Percent of Inorganic Nitrogen
     from Nitrate and Ammonium (kg/ha)           Wet Deposition from Ammonium

        |      |   |   |   |   |    |                   |   |    |    |    |

       1       2   3   4   5   6   7                30      40   50   60   70
What Is NADP?                                                in 1978. The goal was to provide data on the
                                                             amounts, temporal trends, and geographic
In 2000, scientists, students, educators, and others         distributions of acids, nutrients, and base cations
interested in the National Atmospheric Deposition            in precipitation. Initially organized as a regional
Program (NADP) logged more than 100,000                      project, the network grew and expanded its
sessions on the NADP Internet site (see the back             coverage to the entire country and today is SAES
cover for the address). They viewed more than                National Research Support Project - 3. The U.S.
145,000 maps of chemical deposition from precipi-            National Acid Precipitation Assessment Program,
tation and retrieved nearly 17,000 data files.               established in 1981 to improve understanding of
Records show that about 60 percent of users study            the causes and effects of acidic precipitation,
atmospheric deposition or its effects on aquatic and         provided support for much of the network growth.
terrestrial ecosystems and cultural resources and 40         Today there are more than 220 sites in NADP’s
percent use NADP data for educational purposes.              nationwide precipitation chemistry network, now
                                                             called the National Trends Network (NTN).
NADP is now in its third decade of recording high-
quality precipitation chemistry data. This coop-             In the 1990s, NADP expanded to include two
erative effort is supported by government agencies           additional networks. The Atmospheric Integrated
at the national, state, and local levels, State Agri-        Research Monitoring Network (AIRMoN) joined
cultural Experiment Stations, universities, and              NADP in October 1992. In 2000, there were ten
private organizations. Peer review scientists have           AIRMoN sites collecting samples within 24 hours
said that NADP “is perhaps the most significant,             of the start of precipitation. AIRMoN measures
long-term, continuous, and comprehensive                     the same chemicals as NTN, but sampling is daily
sampling and analysis program to be undertaken in            rather than weekly. These higher resolution
the environmental sciences.” Certainly, the length           samples enhance researchers’ ability to evaluate
and quality of the data record are due to the                how emissions affect precipitation chemistry
continued commitment of NADP sponsors and                    using computer models that simulate atmospheric
participating scientists.                                    transport and removal of pollutants on a storm-by-
                                                             storm basis. AIRMoN also evaluates new sample
Why does NADP keep such diligent vigil over our              collection and preservation methods.
precipitation? The answer lies in our need to
monitor how human activities and the forces of               The Mercury Deposition Network (MDN), joined
nature affect air and precipitation quality, i.e., the       NADP in 1996. All samples from the 52 MDN
health of the atmosphere. The information we gain            sites are analyzed for total mercury, and some are
will equip us to make more responsible decisions             analyzed for the more toxic methyl mercury.
about how to preserve and improve our air quality            Forty-two states have advisories warning people to
and how to manage our agricultural, forest, aquatic,         limit their consumption of fish and wildlife from
cultural, and energy resources.                              certain water bodies because of mercury contami-
                                                             nation. MDN data enable researchers to determine
NADP Past and Present                                        seasonal and annual fluxes of mercury in precipi-
                                                             tation falling on lakes, wetlands, streams, forested
                                                             watersheds, and other sensitive ecosystems.
In 1977, U.S. State Agricultural Experiment
Stations (SAES) organized a project, later titled            [About the cover: Pictured are the average annual wet
NADP, to measure atmospheric deposition and                  deposition of nitrogen from nitrate and ammonium and the
study its effects on the environment. Sites in the           percent of nitrogen wet deposition from ammonium for two
NADP precipitation chemistry network first began             periods: 1986-1990 and 1996-2000.]
collecting weekly samples for chemical analysis


                                                         2
This Report                                                                                                                                                                depositions indicated in the legend. (For a more
                                                                                                                                                                           complete description of the algorithm used to
NTN Data                                                                                                                                                                   compute grid-point values, see the NADP
The NTN maps portray spatial variability in the                                                                                                                            Internet site.)
concentration and wet deposition of selected
acids, nutrients, and base cations on regional and                                                                                                                         In addition to the map of inorganic nitrogen wet
national scales. Only sites meeting prescribed data                                                                                                                        deposition, below, concentration and deposition
completeness criteria are included. In 2000, 175                                                                                                                           maps show laboratory pH (H+), sulfate (SO42-),
sites met these criteria. Black dots mark site                                                                                                                             nitrate (NO3-), ammonium (NH4+), calcium (Ca2+),
locations. Annual concentration or deposition                                                                                                                              magnesium (Mg 2+), sodium (Na+), and chloride
values are printed next to each site. The concen-                                                                                                                          (Cl-). Also shown is a map of total precipitation.
trations are precipitation-weighted averages. (For                                                                                                                         Maps of potassium (K+), field pH, and field H+
an explanation of the data completeness criteria or                                                                                                                        deposition are not included but are available from
how the precipitation-weighted averages or                                                                                                                                 the NADP Internet site.
deposition fluxes were calculated, see the NADP
Internet site.)                                                                                                                                                                 Explanation of NTN Color Contours: Refer
                                                                                                                                                                                to the figure below, which has eight inorganic
Color contours on the NTN maps were created by                                                                                                                                  nitrogen deposition classes or contours. The
using site values to compute an array of regularly                                                                                                                              light green contour in the middle represents
spaced grid-point values covering the country.                                                                                                                                  3.0 - 4.0 kilograms per hectare (kg/ha).
Sites within 500 kilometers of each grid point                                                                                                                                  Nitrogen deposition values in the area covered
were used in computations. Color contours were                                                                                                                                  by this contour are greater than 3.0 kg/ha and
drawn on this array of grid-point values. Each                                                                                                                                  less than or equal to 4.0 kg/ha.
contour represents the class of concentrations or
                                     #
                                     1.8
                                                                   #                                                                                                                                                                                                                                               #
                               #
                                                                 1.1                       #                                                                                                                                                                                                                      2.4
                           0.9                   1.1                                       1.1                                                             #
                                                     #
                                                                                                                     #
                                                                                                                                                       4.6                                   3.0                                                                                                             2.6
                           #                                                                                      1.6                                                      4.0                #          #                                                                                                    #
                               2.0                                      0.6                                                                      4.2                            #                        4.7
                   #                                                       #                                                                                                                   #
                       0.8                 #                                                                                                      #                                 4.4          4.5                                                                                  5.9                  3.3
                       #                   0.6                                                                                                                        4.4                #                                                                                                       5.6       # 3.8
                       0.8                                                                        1.1                                                                                                        4.6                                                                       #         #          # #
                                                                                                   #
                                                                                                                                                                           #         #                       #                           #                                            5.0    #         #
                                                                                   #                                                                                           4.7           #                                                                                              #              5.1 3.4
                             #                                                                                                                                                   #           6.2             6.0                       4.3                                    9.8
                                                                                   1.0                                                                                                               #                #                                                                    5.2       6.6
                           0.4                   #                                                                                                                              4.6                7.2                                                                            #               #              4.7
                                                             #                                                                                        4.6                                                    #
                                                                                                                                                                                                                                   #                                        6.8                              #     #
               #                                 0.6                                                                             3.3                                                                                                                                                           #                        4.6
            0.4                                              1.0                                                                     #
                                                                                                                                                       #              #                                      5.1                   6.6       #                               #         7.5 5.8 #
                                                                                       0.9                                                                           5.8                               #                                     6.0                 8.2      4.4            #
                                                                                                                                                                                                                                                                                           7.0 4.8
                                                                                           #
                                                                                           #
                                                                                                                                                                                                       6.4            6.9                                         #       #
                                                                                                                                                                                                                                                                                            # #
                                                                                                                                                                                                 #                                                                        4.8
                                                                   #                   1.0                                                                                                    6.6
                                                                                                                                                                                                                       #                                             # #       6.7
     0.7                                                         3.3       #   0.6                                                                                                                               5.7                                               7.4 6.2
      #                                                                                                                                                                                                               #    #   #              6.7 5.6                   #
                                                                                                                                                                                                                                                                        #                    #   5.1
           2.1                                                                                                 2.2                       3.5                   4.9                                                     6.4 5.6                     #     #            6.0 #6.7
           #                 0.3                                                                                                                                                5.0                                                    #                                      4.8                #
                               #                                                                       1.7       #                           #                  #                #                     #          5.6                              #
                                                                                                           #
                                                                                                                                                                              5.0      5.2 # 7.0 6.9               #
                                                                                                                                                                                                                                     #
                                                                                                                                                                                                                                        # 4.8
                                                                                                                                                                                                                                              3.6
                       #                                                   0.9             1.8             #                                                                             #    5.6           #                    3.9
                                                                                                            2.0                                                                                        #
                       2.1                                                     #                 # 1.3
                                                                                                 #                                                                                                       6.1 6.0                #
                                                                                                  #          #                                                                   5.4                                 5.9        #
           #                                                                   #
                                                                                                 1.3       1.8                       3.0                  #                        #        #
           0.3                                                               0.9                                         1.8             #
                                                                                                                                                          4.3              #
                                                                                                                                                                                             6.4
                                                                                                                                                                                                                       #       4.2
                                                                                                           0.8           #                                                6.2         5.4              #      4.4        #
                                                                                       #               #
                                                                                                                                                              4.8                                                       3.7
                                                                                                                                                                #                       # 4.7        4.7        #                      #
                                                                                    1.4                                                                                        4.5                         5.0                   5.5 4.1
                                                                                                                  #
                                                                                                                 2.0             #                  #
                                                                                                                                                                                 #         #                #
                                                                                                                                                                                                           # 5.0 #
                                                                                                                                                                                                                         4.4
                                                                                                                                                                                                                          #
                                                                                                                                                                                                                             4.5 #
                                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                          #
                                                                                                                                                                                                                                                                                                                                N
                                                                                                                                                   4.8
                                                                                                                                3.4                                                                      5.4 3.5 4.8
                                                                                                                                                                                                              #
                                                                                                                                                                                                                                                                                                                              (kg/ha)
                                 #                                                                #                                                                      #            3.8
                                                                                                                                                                   #                                                           #
                                                                                                                                                                                                                                   6.7   3.8
                               2.1                                                               1.3                                                                4.4 3.2            #                       #
                                                                                                                                                       #                                                                   3.7
                                                                       0.5
                                                                       #
                                                                                                                          #
                                                                                                                                                      4.4             3.8
                                                                                                                                                                       #
                                                                                                                                                                                    3.9
                                                                                                                                                                                    #
                                                                                                                                                                                                     #
                                                                                                                                                                                                   4.4     3.4
                                                                                                                                                                                                                            #
                                                                                                                                                                                                                                                                                                                                 1.0
                                                                                                  2.2
                                                     0.5
                                                         #         1.7                                 #
                                                                                                                          2.0
                                                                                                                                                                                               2.4
                                                                                                                                                                                                            #
                                                                                                                                                                                                                     3.1
                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                                                                                               1.0 - 2.0
                                                                                                                                                                4.1                4.1
                                                                        #
                                                                                                                                                                           #
                                                                                                                                                                                                 #             3.0
                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                             3.1
                                                                                                                                                                                                                                                                                                                               2.0 - 3.0
                                                                                                                                                                                                                 3.5                               2.7
                                                                                                                                                                                                                                                   #
                                                                                                                                                                                                                                                              #                                                                3.0 - 4.0
                                                                                                                                                                                                                  #
                                                                                                                                     1.8
                                                                                                                                         #
                                                                                                                                                                3.9                                3.1
                                                                                                                                                                                                                                                              #
                                                                                                                                                                                                                                                             2.6                                                               4.0 - 5.0
                   Sites not pictured:                                                                           0.9
                                                                                                                     #                                           #
                                                                                                                                                                                                     #
                                                                                                                                                                                                                                                             #
                                                                                                                                                                                                                                                                          2.2
                                                                                                                                                                                                                                                                          #                                                    5.0 - 6.0
                                                                                                                                                                                                                                                                  3.4
                   Alaska 01          0.2 kg/ha                                                                                                       2.6
                                                                                                                                                                                                                                                                                                                               6.0 - 7.0
                                                                                                                                                       #                                                                                                            3.0
                   Alaska 03          0.2 kg/ha                                                                                                                                                                                                                   #

                   Virgin Islands 01 0.7 kg/ha
                                                                                                                                                                                                                                                                                                                               > 7.0
                                                                                                                                                                                                                                                                          2.8
                                                                                                                                                                                                                                                                              #


                   National Atmospheric Deposition Program/National Trends Network


                           Inorganic nitrogen wet deposition from nitrate and ammonium, 2000

                                                                                                                                                                      3
                                  #
                                5.0
                                                                 #                                                                                                                                                                                                                                                         #
                          #
                                                               5.1                         #                                                                                                                                                                                                                              4.7
                      4.9                     5.3                                         5.4                                                               #
                                                  #
                                                                                                                     #
                                                                                                                                                        5.7                                   5.1                                                                                                                    4.8
                      #                                                                                           5.3                                                        5.2               #          #                                                                                                           #
                          5.2                                         5.2                                                                        6.0                             #                        4.8
              #                                                          #                                                                                                                      #
                  5.3                   #                                                                                                         #                                  5.1          4.8                                                                                         4.5            4.7
                  #                    5.2                                                                                                                              5.3               #                                                                                                              4.6 # 4.6
                  5.3                                                                            5.4                                                                                                          5.2                                                                              #         #          # #
                                                                                                   #
                                                                                                                                                                            #         #                       #                            #                                                  4.6    #         #
                                                                                  #                                                                                             5.1           #                                                                                                     #              4.5 4.7
                        #                                                                                                                                                         #           5.2             4.9                         4.6                                         4.4
                                                                                 5.4                                                                                                                  #                #                                                                           4.5       4.4
                      5.3                     #                                                                                                                                  5.2                5.3                                                                                   #              #               4.4
                                                           #                                                                                          6.2                                                     #
                                                                                                                                                                                                                                     #                                              4.3                              #     #
          #                                   5.5                                                                                5.6                                                                                                                                                                    #                       4.6
       5.4                                                5.5                                                                        #
                                                                                                                                                        #              #                                      5.1                    4.6        #                                    #          4.4 4.4 #
                                                                                      5.4                                                                             5.6                               #                                       4.5                    4.3        4.3             #
                                                                                                                                                                                                                                                                                                    4.4 4.5
                                                                                          #                                                                                                             5.1            4.8                                              #         #
                                                                                          #                                                                                                       #                                                                            4.3      # #
                                                                 #                    5.1                                                                                                      5.3
                                                                                                                                                                                                                        #                                                 # #       4.4
5.4                                                            6.3       #   5.3                                                                                                                                  4.9                                                   4.3 4.3
#                                                                                                                                                                                                                      #    #   #                4.5 4.4                     #
                                                                                                                                                                                                                                                                             #           # 4.4
      6.0               5.6                                                                                    5.5                       5.5                    5.5              5.3                                    4.7 4.7           #
                                                                                                                                                                                                                                                      #     #              4.3 4.4
                                                                                                                                                                                                                                                                                # 4.4      #
      #                                                                                                5.2       #                           #                   #
                          #
                                                                                                           #
                                                                                                                                                                                  #
                                                                                                                                                                                      4.7        4.6 4.4 # 4.3
                                                                                                                                                                                                        #
                                                                                                                                                                                                                 #              #                                                 #        4.6
                                                                                           5.1             #                                                                 5.0        #    4.6           #
                                                                                                                                                                                                                                                                                     # 4.4
                  #                                                      5.4                                5.0                                                                                      #                                                                       4.6
                  5.5                                                        #                  # 5.2
                                                                                                #                                                                                                      4.4 4.4                #
                                                                                                 #           #                                                                  4.7                                4.4        #
      #                                                                      #
                                                                                                5.0        4.8                       5.6                  #                       #        #
      5.3                                                                  5.0                                           5.8             #
                                                                                                                                                          5.4             #
                                                                                                                                                                                            4.6
                                                                                                                                                                                                                     #       4.5
                                                                                      #                #
                                                                                                           5.1           #
                                                                                                                                                              5.2
                                                                                                                                                                         4.9         4.7             #       4.5       #
                                                                                                                                                                                                                      4.6
                                                                                                                                                                                                                                                                                                                                  Lab pH
                                                                                                                                                                #                      # 4.7       4.6         #                     #
                                                                                  4.9                                                                                         4.8                        4.4                   4.6 4.6
                                                                                                                  #
                                                                                                                 5.1             #                  #
                                                                                                                                                                                #         #
                                                                                                                                                                                                         #
                                                                                                                                                                                                           #
                                                                                                                                                                                                            4.6 #
                                                                                                                                                                                                                       4.4
                                                                                                                                                                                                                        #
                                                                                                                                                                                                                           4.5 #
                                                                                                                                                                                                                                #
                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                                                                        5.3
                                                                                                                                                   5.2
                            #
                            5.2
                                                                                                  #
                                                                                                 5.1
                                                                                                                                5.8                               #     #
                                                                                                                                                                   5.1 4.8
                                                                                                                                                                                     4.7
                                                                                                                                                                                      #
                                                                                                                                                                                                       4.4 4.6 4.7
                                                                                                                                                                                                             #
                                                                                                                                                                                                              #
                                                                                                                                                                                                                             #
                                                                                                                                                                                                                                 4.7   4.7                                                                                            5.2 - 5.3
                                                                                                                                                       #
                                                                                                                                                                     4.8                           #
                                                                                                                                                                                                                         4.5                                                                                                          5.1 - 5.2
                                                                                                                                                      4.9                         4.7                                     #
                                                                     5.1
                                                                     #                           5.2
                                                                                                                          #
                                                                                                                          5.5
                                                                                                                                                                      #            #             4.6     4.5
                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                                                                      5.0 - 5.1
                                                  5.2                                                                                                                                                                                                            4.7
                                                      #          5.1
                                                                      #
                                                                                                      #
                                                                                                                                                                           4.7                                    4.7
                                                                                                                                                                                                                                    4.6
                                                                                                                                                                                                                                     #                    4.7
                                                                                                                                                                                                                                                                   #                                                                  4.9 - 5.0
                                                                                                                                                                            #                                     #
                                                                                                                                                                                                                                                            #
                                                                                                                                                                                                                                                                  4.6                                                                 4.8 - 4.9
                                                                                                                                                                                                                                                      4.7          #

                                                                                                                                     5.0
                                                                                                                                                                                                                  4.7
                                                                                                                                                                                                                   #                                  #
                                                                                                                                                                                                                                                                   #
                                                                                                                                                                                                                                                                                                                                      4.7 - 4.8
              Sites not pictured:                                                                                5.0
                                                                                                                                         #
                                                                                                                                                                 4.9                                4.7
                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                   4.7
                                                                                                                                                                                                                                                                                  4.7                                                 4.6 - 4.7
                                                                                                                                                                  #
                                                                                                                                                                                                                                                                                                                                      4.5 - 4.6
                                                                                                                     #                                                                                                                                             #              #
                                                                                                                                                                                                                                                                        4.5
              Alaska 01          5.2                                                                                                                  5.0
              Alaska 03          5.2                                                                                                                    #
                                                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                            4.7
                                                                                                                                                                                                                                                                                                                                      4.4 - 4.5
              Virgin Islands 01 5.0                                                                                                                                                                                                                                               5.0
                                                                                                                                                                                                                                                                                                                                      4.3 - 4.4
                                                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                                                                      < 4.3



                                  #
                                0.17
                                                                 #                                                                                                                                                                                                                                                         #
                          #
                                                               0.05                        #                                                                                                                                                                                                                          0.17
                      0.11                    0.03                                        0.01                                                              #
                                                  #
                                                                                                                     #
                                                                                                                                                        0.02                                  0.06                                                                                                                  0.19
                      #                                                                                          0.02                                                       0.05               #          #                                                                                                           #
                     0.09                                             0.02                                                                       0.01
              #                                                          #                                                                                                       #    # 0.09
                  0.04                  #                                                                                                         #                            0.06 0.10                                                                                                      0.34            0.26
                  #
                                       0.03                                                                                                                             0.04      #                                                                                                            #
                                                                                                                                                                                                                                                                                                         0.35 # 0.28
              0.10                                                                               0.01                                                                                      0.06                                                                                                          #          # #
                                                                                                   #
                                                                                                                                                                           #    #          #                                               #                                              0.33 #               #
                                                                                  #                                                                                         0.05 #                                                                      0.39 0.27                                   #
                        #                                                                                                                                                      # 0.05 # 0.11                                             0.15
                                                                                                                                                                                                                                      0.55 0.35 0.47
                   0.01                                                          0.01                                                                                                           #
                                                                                                                                                                                                                                         #
                                              #                                                                                                   < 0.01                     0.04     0.06 #                                                         #     # 0.45
          #                                   0.01
                                                           #                                                                     0.01                                                            #                                   0.39              #        # 0.36
                                                                                                                                                                                           0.06                                             0.66 0.48 #
                                                                                                                                                    #
      0.01                                                0.01                                                                       #                                  #                       0.21       #                           #
                                                                                      0.02                                                                            0.02               #               0.24               0.59 0.37           #
                                                                                                                                                                                                                                                  0.52 0.35
                                                                                          #
                                                                                          #
                                                                                                                                                                                        0.06 0.17                            #      #
                                                                                                                                                                                                                                                   #
                                                                                                                                                                                      #                                              0.41      #
                                                                 #                    0.04                                                                                          0.04
                                                                                                                                                                                                #                               # #        0.53
0.03                                                       < 0.01 # 0.01                                                                                                                     0.11                            0.60 0.50
 #                                                                                                                                                                                    # # #                0.31 0.36                #
                                                                                                                                                                                                                                    #           # 0.42
   0.01               < 0.01                                                                              0.01                        0.01               0.02       0.03               0.22 0.19 #             #     #           0.48 0.46
                                                                                                                                                                                                                                       # 0.41       #
      #                                                                                               0.02 #                                 #              #
                          #                                                                                                                                           #         #
                                                                                                                                                                                                   0.26 0.41   # 0.51                    #          0.34
                                                                                                           #                                                                                  #
                                                                                          0.06             #                                                                   0.08 0.19 0.22
                                                                                                                                                                                         #                     #
                                                                                                                                                                                                                       #                     # 0.42
                  #                                                   < 0.01                               0.04                                                                                         #                           0.27
              0.05                                                           #                  # 0.03
                                                                                                #                                                                                                        0.44 0.42                  #
                                                                                                 #           #                                                                    0.23                                                                                                                                                      +
      #
    0.02                                                                 0.02
                                                                             #
                                                                                               0.05 0.05
                                                                                                                     < 0.01
                                                                                                                                     0.01
                                                                                                                                         #
                                                                                                                                                           #
                                                                                                                                                          0.03             #
                                                                                                                                                                                    #        #
                                                                                                                                                                                            0.33
                                                                                                                                                                                                                        0.47
                                                                                                                                                                                                                          #
                                                                                                                                                                                                                                    #
                                                                                                                                                                                                                                   0.37                                                                                                Lab H
                                                                                                                                                                          0.12
                                                                                      #                #
                                                                                                          0.01           #
                                                                                                                                                               0.06
                                                                                                                                                                  #
                                                                                                                                                                                0.19
                                                                                                                                                                                      0.25
                                                                                                                                                                                         # 0.25
                                                                                                                                                                                                        #
                                                                                                                                                                                                     0.27
                                                                                                                                                                                                                0.31
                                                                                                                                                                                                                   #
                                                                                                                                                                                                                             #
                                                                                                                                                                                                                           0.23             #
                                                                                                                                                                                                                                                                                                                                      (kg/ha)
                                                                                  0.04                                                                                                     #
                                                                                                                                                                                                            0.38                    0.30 0.24
                                                                                                                  #
                                                                                                                                                    #
                                                                                                                                                                                  #                           #             0.32      #
                                                                                                                                                                                                             # 0.33 #
                            #                                                                     #
                                                                                                                 0.03            #
                                                                                                                               0.01               0.05                    #           0.18                0.52 0.27 0.37
                                                                                                                                                                                                                 #
                                                                                                                                                                                                                              #
                                                                                                                                                                                                                                 0.35 #
                                                                                                                                                                                                                                   #
                                                                                                                                                                                                                                               #                                                                                        0.10
                                                                                                                                                                                                                                      0.21 0.29
                                                                                                                                                                    #
                          0.04                                                                  0.03                                                                0.10 0.13
                                                                                                                                                       #
                                                                                                                                                                                       #                          #

                                                                                                                                                                                                                               0.32
                                                                                                                                                                                                                                                                                                                                      0.10 - 0.15
                                                                 0.02                                                     #
                                                                                                                                                     0.12             0.20
                                                                                                                                                                        #
                                                                                                                                                                                    0.22
                                                                                                                                                                                     #
                                                                                                                                                                                                      #
                                                                                                                                                                                                   0.25 0.32
                                                                                                                                                                                                                                 #                                                                                                    0.15 - 0.20
                                                                     #
                                                  0.01
                                                      #          0.05
                                                                                                 0.03
                                                                                                      #
                                                                                                                          0.01
                                                                                                                                                                                                                                    0.18
                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                 0.19                                                                 0.20 - 0.25
                                                                                                                                                                                                                                                                   #
                                                                      #                                                                                                 0.25
                                                                                                                                                                            #
                                                                                                                                                                                                              0.20
                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                     #                    0.21
                                                                                                                                                                                                                                                            #
                                                                                                                                                                                                                                                                                                                                      0.25 - 0.30
                                                                                                                                                                                                                                                                  0.25
                                                                                                                                                                                                              0.21                                    0.20
                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                   #                                                                  0.30 - 0.35
                                                                                                                                  0.06
                                                                                                                                         #                                                         0.24
                                                                                                                                                                                                                   #                                               #
                                                                                                                                                                                                                                                                  0.19                                                                0.35 - 0.40
                                                                                                                                                                0.15
              Sites not pictured:                                                                              0.03
                                                                                                                     #                                            #
                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                   #
                                                                                                                                                                                                                                                                                  0.17
                                                                                                                                                                                                                                                                                  #                                                   0.40 - 0.45
                                                                                                                                                                                                                                                                       0.30
              Alaska 01          0.03 kg/ha                                                                                                           0.07                                                                                                                                                                            0.45 - 0.50
                                                                                                                                                                                                                                                                         0.19
              Alaska 03          0.02 kg/ha                                                                                                             #
                                                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                                                                      0.50 - 0.55
              Virgin Islands 01 0.08 kg/ha                                                                                                                                                                                                                                        0.16
                                                                                                                                                                                                                                                                                      #                                               > 0.55
              National Atmospheric Deposition Program/National Trends Network



          Hydrogen ion concentration as pH (top) and wet deposition (bottom) from
              measurements made at the Central Analytical Laboratory, 2000.


                                                                                                                                                                       4
                                   #
                                   0.4
                                                                 #                                                                                                                                                                                                                                                                                                           #
                           #
                                                               0.3                           #                                                                                                                                                                                                                                                                          0.8
                        0.6                    0.3                                           0.6                                                                          #
                                                   #
                                                                                                                               #
                                                                                                                                                                      0.6                                        0.8                                                                                                                                                0.7
                       #                                                                                                   0.8                                                                  0.8                  #           #                                                                                                                                    #
                           0.3                                        0.4                                                                                    0.7                                 #                               1.4
               #                                                         #                                                                                                                                            #
                   0.3                   #                                                                                                                    #                                       1.0            1.2                                                                                                                 1.5                    0.9
                   #                     0.2                                                                                                                                           0.8                   #                                                                                                                                        1.3       # 1.1
                   0.2                                                                                0.6                                                                                                                            0.9                                                                                                  #           #             # #
                                                                                                          #
                                                                                                                                                                                            #            #                           #                                  #                                                                1.2    #           #
                                                                                     #                                                                                                          1.0              #                                                                                                                             #                1.3 1.1
                         #                                                                                                                                                                           #           1.0                  1.3                              1.5                                                         2.2
                                                                                 0.4                                                                                                                                         #                   #                                                                                            1.2         1.7
                       0.2                     #                                                                                                                                                 1.1                     1.0                                                                                                         #                #                 1.9
                                                           #                                                                                                      1.0                                                                #
                                                                                                                                                                                                                                                                  #                                                            2.6                                  #        #
           #                                   0.4                                                                                           0.8                                                                                                                                                                                                  #                              1.4
       0.1                                                 0.4                                                                                   #
                                                                                                                                                                   #                   #                                              1.2                         1.6               #                                           #         1.9 1.5 #
                                                                                         0.4                                                                                          1.0                                    #                                                      2.1                           2.6        1.9            #
                                                                                                                                                                                                                                                                                                                                              1.8 1.4
                                                                                             #                                                                                                                               1.3              1.3                                                                 #          #
                                                                                             #                                                                                                                        #                                                                                                   2.2                  # #
                                                                 #                       0.4                                                                                                                         1.4
                                                                                                                                                                                                                                                 #                                                                   # #       1.8
0.2                                                            0.7       #   0.4                                                                                                                                                         1.7                                                                       2.6 2.5
#                                                                                                                                                                                                                                             #      #       #                       2.1 2.3                            #
                                                                                                                                                                                                                                                                                                                        #                         #   1.9
      0.3                                                                                                              1.0                           0.8                      1.2                                                                1.8 1.7                                    #       #                 2.5 #2.1
      #                  0.3                                                                                                                                                                     1.1                                                                   #                                                      2.0                     #
                           #                                                                                  0.6          #                             #                     #                     #                       #
                                                                                                                                                                                                                                                                      2.0 2.4               #        2.4
                                                                                                                   #                                                                                                                             1.6         #                                          #
                                                                                                                                                                                                                                                                                                                                     #            1.3
                                                                                             0.4                   #                                                                                                         1.4                     #       1.9                            #
                                                                                                                                                                                                                                                                                                                                          #    1.7
                   #                                                     1.2                                       0.7                                                                                                                                                          #                                             1.3
                   0.2                                                       #                       # 0.4
                                                                                                     #                                                                                                                                                                              2.1 2.2                                  #
                                                                                                      #             #                                                                                                                1.4                                                                    1.7              #
      #                                                                      #
                                                                                                     0.3           0.8                           1.0                           #                                                         #               #                                                   #               1.5                                                                     -
                                                                                                                                                                                                                                                                                                                                                                        Sulfate as SO42
                                                                           0.6                                                     0.9               #                                                           #
      0.2                                                                                                                                                                     1.1                                                                        1.6
                                                                                                                  0.9              #                                                                             1.2                             1.4                            #        1.7    #
                                                                                         #                    #
                                                                                                                                                                                       0.9                                                                                                    1.5
                                                                                                                                                                                                                                                                            1.5            #
                                                                                                                                                                                                                                                                                                                                                                            (mg/L)
                                                                                                                                                                                            #                                                        #   1.3                                                 #
                                                                                     0.9                                                                                                                                         1.1                                                  2.2              1.5 1.3
                                                                                                                           #                                                                                                         #                   #                             #        2.1     #
                                                                                                                                                                   #
                                                                                                                                                                                                                                                                                      # 1.2 #
                                                                                                                                             #                                                                                                                                                   #
                                                                                                                           0.8                                 1.1                                                                                                                                  1.6 #       #
                             #                                                                        #                                     1.0                                                                  #                               1.0                                2.0 1.1 1.1
                                                                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                                     #         1.0
                                                                                                                                                                                                                                                                                                                                                                                         0.50
                                                                                                                                                                                                #
                             0.4                                                                     0.6                                                                                         0.9 1.0                                         #                                              #        1.6

                                                                                                                                                                       1.1
                                                                                                                                                                          #
                                                                                                                                                                                                         1.0                              1.1                               #
                                                                                                                                                                                                                                                                                                                      1.5
                                                                                                                                                                                                                                                                                                                        #                                                              0.50 - 0.75
                                                                     0.5                                                                                                                                                                                               1.5
                                                    0.6
                                                                     #                                0.8
                                                                                                                                    #
                                                                                                                                    1.3
                                                                                                                                                                                                             #                               #                                          1.5
                                                                                                                                                                                                                                                                                          #                                                                                            0.75 - 1.00
                                                                 0.6                                       #                                                                                                                                                                                                1.0
                                                       #
                                                                      #                                                                                                                    1.3                                           1.2
                                                                                                                                                                                                                                                                 1.3
                                                                                                                                                                                                                                                                  #                             0.9
                                                                                                                                                                                                                                                                                                             #                                                                         1.00 - 1.25
                                                                                                                                                                                            #                                            #
                                                                                                                                                                                                                                                                                                    #
                                                                                                                                                                                                                                                                                                             1.2                                                                       1.25 - 1.50
                                                                                                                                                                                                                                                                                            1.0               #

                                                                                                                                                 1.2
                                                                                                                                                                                                                                         1.1
                                                                                                                                                                                                                                          #                                                 #
                                                                                                                                                                                                                                                                                                              #                                                                        1.50 - 1.75
                                                                                                                                                                                                                         1.0                                                                                 1.0
           Sites not pictured:                                                                                          0.8
                                                                                                                                                     #
                                                                                                                                                                               1.1
                                                                                                                                                                                  #
                                                                                                                                                                                                                             #                                                                                               1.2
                                                                                                                                                                                                                                                                                                                             #
                                                                                                                                                                                                                                                                                                                                                                                       1.75 - 2.00
                                                                                                                               #                                                                                                                                                                             #
           Alaska 01           0.1 mg/L                                                                                                                           1.2
                                                                                                                                                                                                                                                                                                                  1.4                                                                  2.00 - 2.25
                                                                                                                                                                                                                                                                                                                      1.1
           Alaska 03           0.2 mg/L                                                                                                                               #
                                                                                                                                                                                                                                                                                                                  #                                                                    2.25 - 2.50
           Virgin Islands 01 0.9 mg/L                                                                                                                                                                                                                                                                                                                                                  > 2.50
                                                                                                                                                                                                                                                                                                                              0.8
                                                                                                                                                                                                                                                                                                                                 #




                                   #
                                   6
                                                                 #                                                                                                                                                                                                                                                                                                           #
                           #
                                                                 2                           #                                                                                                                                                                                                                                                                            8
                           5                   1                                             2                                                                            #
                                                   #
                                                                                                                               #
                                                                                                                                                                       4                                             5                                                                                                                                                8
                       #                                                                                                       2                                                                6                    #           #                                                                                                                                    #
                             5                                           1                                                                                   4                                   #                                8
               #                                                         #                                                                                                                                            #
                    2                    #                                                                                                                    #                                          7               8                                                                                                               16                      10
                   #                     1                                                                                                                                                 6                 #                                                                                                                                        16        #       12
                   3                                                                                      2                                                                                                                           7                                                                                                   #           #             # #
                                                                                                          #
                                                                                                                                                                                            #            #                           #                                  #                                                                14     #           #
                                                                                     #                                                                                                           7               #                                                                                                                             #                16        13
                         #                                                                                                                                                                           #           8                       11                             9                                                          27
                                                                                     1                                                                                                                                       #                   #                                                                                             15         22
                       <1                      #                                                                                                                                                     7                    11                                                                                                         #                #                   21
                                                           #                                                                                                       4                                                                 #
                                                                                                                                                                                                                                                                  #                                                            22                                   #        #
           #                                    1                                                                                               3                  #                                                                     9                                                                                                            19    #                    19
       <1                                                  1                                                                                     #                                     #                                                                          13                #                                           #            28           #
                                                                                             2                                                                                        6                                      #                                                      16                            28         16                 #
                                                                                                                                                                                                                                                                                                                                                      24 16
                                                                                             #                                                                                                                                   11           15                                                                  #          #
                                                                                             #                                                                                                                        #                                                                                                         18             # #
                                                                 #                           2                                                                                                                       12
                                                                                                                                                                                                                                                 #                                                                     #      #      22
2                                                                3       #       1                                                                                                                                                        13                                                                       29        24
#                                                                                                                                                                                                                                             #      #       #                       19             20                       #
                                                                                                                                                                                                                                                                                                                             #                    #
                                                                                                                                                                                                                                                                                                                                                    19
      2                                                                                                                 2                                3                    7                                                                   18 16                                     #       #                       22 # 23
      #                  <1                                                                                                                                                                          8                                                                 #                                                            19                #
                           #                                                                                   2           #                             #                     #                     #                       #
                                                                                                                                                                                                                                                                       19                   #        26
                                                                                                                   #                                                                                                                              14         #
                                                                                                                                                                                                                                                                                    23                  #
                                                                                                                                                                                                                                                                                                                                     #                17
                                                                                                 3                 #                                                                                                         11                      #       17                             #
                                                                                                                                                                                                                                                                                                                                          #    19
                   #                                                         1                                         3                                                                                                                                                        #                                             14
                   2                                                         #                       #
                                                                                                     #    2                                                                                                                                                                         24          22                           #
                                                                                                      #             #                                                                                                                 15                                                                    21               #
      #                                                                      #
                                                                                                      2             3                                4                         #                                                         #               #                                                   #               16                                                                      -
                                                                                                                                                                                                                                                                                                                                                                        Sulfate as SO42
                                                                             1                                                     2                 #                                                           #
       1                                                                                                                                                                       7                                                                             22
                                                                                                                   1               #                                                                             13                              17                             #               15                #
                                                                                         #                    #
                                                                                                                                                                                       9                                                                                                                         12
                                                                                                                                                                                                                                                                            16                  #
                                                                                         3
                                                                                                                           #
                                                                                                                                                                   #
                                                                                                                                                                                            #
                                                                                                                                                                                                                                 13
                                                                                                                                                                                                                                     #
                                                                                                                                                                                                                                                     #   15
                                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                        20
                                                                                                                                                                                                                                                                                         #         17
                                                                                                                                                                                                                                                                                                         17 13
                                                                                                                                                                                                                                                                                                          #
                                                                                                                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                                                                                                            (kg/ha)
                                                                                                                           3                 #
                                                                                                                                                                                                                                                                                        # 17 #     #
                                                                                                                                                                                                                                                                                                      17 #     #
                                                                                                                                            4                     9
                                                                                                                                                                                                                                                                                             13 19
                             #                                                                        #                                                                                                                                                                                    #
                                                                                                                                                                                                                                                 11
                                                                                                                                                                                                                                                                                                                                                                                         3
                                                                                                                                                                                                #                #                                                                  26                 #       15
                               2                                                                      2                                                                                          10                  9                           #                                              #          17

                                                                                                                                                                       12
                                                                                                                                                                          #
                                                                                                                                                                                                         12                               13                                #
                                                                                                                                                                                                                                                                                                                      15
                                                                                                                                                                                                                                                                                                                        #                                                              3-6
                                                                     1                                                                                                                                                                                                  16
                                                       1
                                                                     #                                    4
                                                                                                                                    #
                                                                                                                                        4
                                                                                                                                                                                                             #                               #                                          15
                                                                                                                                                                                                                                                                                          #                                                                                            6-9
                                                                     3                                                                                                                                                                                                                                      10
                                                                                                                                                                                                                                                                                                                                                                                       9 - 12
                                                       #                                                   #                                                                                                                                                     10                                          #
                                                                      #                                                                                                                    16                                            13                       #                             10
                                                                                                                                                                                            #                                            #
                                                                                                                                                                                                                                                                                                    #
                                                                                                                                                                                                                                                                                                             12                                                                        12 - 15
                                                                                                                                                                                                                                                                                            10                #

                                                                                                                                                  7
                                                                                                                                                                                                                                         11
                                                                                                                                                                                                                                          #                                                 #
                                                                                                                                                                                                                                                                                                              #                                                                        15 - 18
                                                                                                                                                                                                                                                                                                              9
           Sites not pictured:                                                                                             2
                                                                                                                                                     #
                                                                                                                                                                               12
                                                                                                                                                                                  #
                                                                                                                                                                                                                         12
                                                                                                                                                                                                                             #
                                                                                                                                                                                                                                                                                                                             #
                                                                                                                                                                                                                                                                                                                              10                                                       18 - 21
                                                                                                                               #                                                                                                                                                                             #
           Alaska 01           1 kg/ha                                                                                                                             9
                                                                                                                                                                                                                                                                                                                  15                                                                   21 - 24
                                                                                                                                                                                                                                                                                                                      10
           Alaska 03           1 kg/ha
                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                                                  #                                                                    24 - 27
           Virgin Islands 01 6 kg/ha                                                                                                                                                                                                                                                                                          11
                                                                                                                                                                                                                                                                                                                                                                                       > 27
                                                                                                                                                                                                                                                                                                                                 #


           National Atmospheric Deposition Program/National Trends Network




                           Sulfate ion concentration (top) and wet deposition (bottom), 2000.


                                                                                                                                                                                      5
                                       #
                                       0.4
                                                                         #                                                                                                                                                                                                                                                                                                                                  #
                              #
                                                                        0.5                              #                                                                                                                                                                                                                                                                                              0.7
                          0.3                      0.5                                                   0.9                                                                            #
                                                       #
                                                                                                                                           #
                                                                                                                                                                                1.0                                             1.0                                                                                                                                                                0.7
                          #                                                                                                            1.0                                                                     1.1               #           #                                                                                                                                                      #
                              0.3                                                0.6                                                                                      1.1                                   #                            1.6
               #                                                                     #                                                                                                                                            #
                      0.2                    #                                                                                                                             #                                         1.2            1.4                                                                                                                            1.5                         0.9
                      #                      0.3                                                                                                                                                      1.1                #                                                                                                                                                        1.2          # 1.0
                   0.1                                                                                            0.8                                                                                                                             1.2                                                                                                               #             #             # #
                                                                                                                      #
                                                                                                                                                                                                           #         #                           #                                          #                                                                     1.2     #                #
                                                                                             #                                                                                                                 1.3              #                                                                                                                                        #                  1.2 0.9
                           #                                                                                                                                                                                        #        1.3                  1.6                                     2.0                                                             2.2
                                                                                             0.6                                                                                                                                         #                    #                                                                                                         1.3           1.5
                          0.3                      #                                                                                                                                                            1.4                     1.3                                                                                                                   #                   #                    1.3
                                                                   #                                                                                                           1.6                                                                #
                                                                                                                                                                                                                                                                                      #                                                                2.0                                         #        #
          #                                        0.6                                                                                                    1.3                                                                                                                                                                                                               #                                   1.1
       0.3                                                         0.9                                                                                        #
                                                                                                                                                                                #                     #                                           1.3                                 1.9                #                                              #           1.5 1.4 #
                                                                                                     0.6                                                                                             1.5                                  #                                                             2.0                             2.1          1.6              #
                                                                                                                                                                                                                                                                                                                                                                        1.5 1.1
                                                                                                         #                                                                                                                                1.6             1.5                                                                           #             #
                                                                                                         #                                                                                                                          #                                                                                                             1.7                    # #
                                                                         #                           0.7                                                                                                                         1.6
                                                                                                                                                                                                                                                              #                                                                              # #       1.6
0.2                                                                     1.1      #       0.8                                                                                                                                                          1.6                                                                                  1.9 1.8
#                                                                                                                                                                                                                                                         #        #          #                          1.8 1.6                                #
                                                                                                                                                                                                                                                                                                                                                #                         #       1.5
      0.6                                                                                                                          1.8                            1.4                       1.5                                                               1.5 1.4                                         #       #                       2.0 #1.6
      #                       0.8                                                                                                                                                                                   1.5                                                                   #                                                           1.4                         #
                              #                                                                                           1.1          #                              #                      #                      #                     #
                                                                                                                                                                                                                                                                                          1.7 1.9             #           1.5
                                                                                                                               #                                                                                                                              1.4             #                                               #
                                                                                                                                                                                                                                                                                                                                                              #                   0.9
                                                                                                         0.8                   #                                                                                                          1.4                     #           1.5                             #
                                                                                                                                                                                                                                                                                                                                                                    #    1.2
                      #                                                              1.7                                       1.1                                                                                                                                                                  #                                                 0.9
                   0.3                                                               #                           # 0.8
                                                                                                                 #                                                                                                                                                                                      1.4 1.6                                       #
                                                                                                                  #             #                                                                                                                 1.2                                                         1.4                                     #
      #                                                                                  #
                                                                                                                 0.7           1.4                            1.2                            #                                                        #                   #
                                                                                                                                                                                                                                                                                                                        1.1
      0.2                                                                            1.5                                                       1.3                #
                                                                                                                                                                                            1.5                                 #
                                                                                                                                                                                                                                                                              1.2
                                                                                                                                                                                                                                                                                                                #
                                                                                                                                                                                                                                                                                                                                                                                                                                    -
                                                                                                  #                    #
                                                                                                                           1.3                 #
                                                                                                                                                                                                      1.1
                                                                                                                                                                                                           #
                                                                                                                                                                                                                                1.3                           1.1
                                                                                                                                                                                                                                                                  #                             1.1
                                                                                                                                                                                                                                                                                                    #    1.4
                                                                                                                                                                                                                                                                                                           #
                                                                                                                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                                                                                                 1.1          #
                                                                                                                                                                                                                                                                                                                                                                                                       Nitrate as NO 3
                                                                                                                                                                                                                                              1.0                         1.0
                                                                                                 1.4
                                                                                                                                       #
                                                                                                                                                                                #
                                                                                                                                                                                                                                                  #                       #
                                                                                                                                                                                                                                                                                                      1.5
                                                                                                                                                                                                                                                                                                       #          1.4
                                                                                                                                                                                                                                                                                                                         1.1 1.0
                                                                                                                                                                                                                                                                                                                          #                                                                                (mg/L)
                                                                                                                                                                                                                                                                                                      # 0.9 #
                                                                                                                                                          #                                                                                                                                                        #
                                                                                                                                       1.3                                  1.2                                                                                                                                       1.2 #      #
                               #                                                                                  #                                      1.2                                                                 #                                1.0                                   1.1 0.8 0.7
                                                                                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                                                           1.2 0.7
                                                                                                                                                                                                                #                                                                                                      #
                               0.8                                                                               1.0                                                                                            0.8 0.9                                       #                                           #                                                                                                             0.60
                                                                                                                                                                                                                                                                                                                                               1.1
                                                                             0.8
                                                                                                                                                                                    #
                                                                                                                                                                                    1.0                              0.8                              0.8                                       #                                               #                                                                     0.60 - 0.75
                                                                                                                                                #                                                                        #                                #                               0.9                0.9
                                                           1.0
                                                                             #                                    1.2                           1.2                                                                                                                                                           #
                                                                                                                                                                                                                                                                                                                                  0.8
                                                                                                                                                                                                                                                                                                                                                                                                                      0.75 - 0.90
                                                                         0.8                                           #                                                                                                                                                          0.8
                                                                                                                                                                                                                                                                                                                                                                                                                      0.90 - 1.05
                                                           #
                                                                                                                                                                                                                                                                                                                                   #
                                                                                 #                                                                                                                        0.8                                         0.9                             #                            0.7
                                                                                                                                                                                                           #                                          #

                                                                                                                                                                                                                                                                                                              0.8
                                                                                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                                                                   1.0
                                                                                                                                                                                                                                                                                                                                    #
                                                                                                                                                                                                                                                                                                                                                                                                                      1.05 - 1.20
                                                                                                                                                                                                                                                     0.9
                                                                                                                                                              0.6                                                                                     #                                                       #
                                                                                                                                                                                                                                                                                                                                    #                                                                                 1.20 - 1.35
                                                                                                                                                                                                                                        0.8                                                                                        0.8
                  Sites not pictured:                                                                                               0.6
                                                                                                                                           #
                                                                                                                                                                  #
                                                                                                                                                                                             0.8
                                                                                                                                                                                              #
                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                                                                   #                 #
                                                                                                                                                                                                                                                                                                                                                      0.8                                                             1.35 - 1.50
                  Alaska 01           0.1 mg/L                                                                                                                                 0.7
                                                                                                                                                                                                                                                                                                                                        1.1
                                                                                                                                                                                                                                                                                                                                                                                                                      1.50 - 1.65
                                                                                                                                                                                                                                                                                                                                               0.9
                  Alaska 03           0.1 mg/L                                                                                                                                  #
                                                                                                                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                                                                                                                                                      1.65 - 1.80
                  Virgin Islands 01 0.3 mg/L                                                                                                                                                                                                                                                                                                                                                                          > 1.80
                                                                                                                                                                                                                                                                                                                                                      0.5
                                                                                                                                                                                                                                                                                                                                                          #




                                        #
                                        6
                                                                         #                                                                                                                                                                                                                                                                                                                                  #
                               #                                         3                                #                                                                                                                                                                                                                                                                                                7
                              3                        2                                                     2                                                                          #
                                                           #
                                                                                                                                           #
                                                                                                                                                                                        7                                           6                                                                                                                                                                  8
                          #                                                                                                                3                                                                    8                   #         #                                                                                                                                                        #
                                  5                                                  2                                                                                     7                                        #                         10
                  #                                                                  #                                                                                                                                               #
                          2                   #                                                                                                                            #                                            9            10                                                                                                                            16                          10
                      #
                                              2                                                                                                                                                            8                #                                                                                                                                                         15       #       11
                      3                                                                                               2                                                                                                                               9                                                                                                             #             #                # #
                                                                                                                       #
                                                                                                                                                                                                           #            #                         #                                         #                                                                      14     #                #
                                                                                                 #                                                                                                              9               #                                                                                                                                        #                     15          10
                              #                                                                                                                                                                                      #          12                    13                                    11                                                                27
                                                                                                 2                                                                                                                                        #                   #                                                                                                          15               19
                              1                    #                                                                                                                                                                9                    14                                                                                                                   #                       #                    14
                                                                    #                                                                                                           7                                                                 #
                                                                                                                                                                                                                                                                                      #                                                                 17                                         #        #
              #                                        1                                                                                                      6                 #                                                                     10                                                                                                                          18       #                    14
           1                                                        2                                                                                         #                                       #                                                                               16                 #                                               #              22            #
                                                                                                         2                                                                                            9                                      #                                                           15                                22         13                  #
                                                                                                                                                                                                                                                                                                                                                                                  20 13
                                                                                                         #                                                                                                                                   13               16                                                                           #          #
                                                                                                         #                                                                                                                           #                                                                                                                   14               # #
                                                                             #                           3                                                                                                                          13
                                                                                                                                                                                                                                                              #                                                                                 #      #      20
 2                                                                       4           #       2                                                                                                                                                            12                                                                                   21     17
#                                                                                                                                                                                                                                                             #       #       #                              17        14                             #
                                                                                                                                                                                                                                                                                                                                                      #                       #   15
       3                                                                                                                               4                              6                      9                                                                    15 14                                       #           #                          17 # 17
       #                          1                                                                                                                                                                                 11                                                                      #                                                                13                   #
                               #                                                                                           4           #                              #                       #                      #                       #
                                                                                                                                                                                                                                                                                            16                #           16
                                                                                                                               #                                                                                                                                  12              #
                                                                                                                                                                                                                                                                                                         18                                                    #                   11
                                                                                                                                                                                                                                             11                                   13
                                                                                                                                                                                                                                                                                                                              #                                      #    13
                      #                                                                  2                   6                 #                                                                                                                                   #
                                                                                                                                                                                                                                                                                                    #
                                                                                                                                                                                                                                                                                                              #                                           9
                                                                                         #                       #
                                                                                                                 #     4           5                                                                                                                                                                     16        16                                 #
                      4                                                                                           #                #                                                                                                                 13
      #                                                                                  #
                                                                                                                  4                5                              5                          #                                                         #                      #                                                   17                  #
                                                                                                                                                                                                                                                                                                                                    #                 12
          1                                                                              3                                                      3                 #
                                                                                                                                                                                              9                                  #
                                                                                                                                                                                                                                                                              16                                                                                                                                                    -
                                                                                                     #                     #
                                                                                                                               2                #
                                                                                                                                                                                                      11
                                                                                                                                                                                                           #
                                                                                                                                                                                                                                14                            13
                                                                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                                                                                    #
                                                                                                                                                                                                                                                                                                    12
                                                                                                                                                                                                                                                                                                                   12
                                                                                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                                                                           #
                                                                                                                                                                                                                                                                                                                                           9                        #
                                                                                                                                                                                                                                                                                                                                                                                                       Nitrate as NO 3
                                                                                                                                                                                                                                                 11                           12
                                                                                                     4
                                                                                                                                           #
                                                                                                                                                                                #
                                                                                                                                                                                                                                                  #                       #
                                                                                                                                                                                                                                                                                                          14
                                                                                                                                                                                                                                                                                                            #                              11
                                                                                                                                                                                                                                                                                                                                                         12
                                                                                                                                                                                                                                                                                                                                                          #        10                                      (kg/ha)
                                                                                                                                           5              #                                                                                                                                               # 13                #             #
                                                                                                                                                                                                                                                                                                                                                    12                    #
                                  #                                                                                #                                      5                    10                                                                             10                                              #                   12                          #
                                                                                                                                                                                                                #               #                                                                        14     9                                    #                   11
                                   5                                                                               4                                                                                                10              8                          #                                                   #                                          12                                                        4
                                                                                 1                                                                                                  10
                                                                                                                                                                                        #
                                                                                                                                                                                                                        10                                10                                    #
                                                                                                                                                                                                                                                                                                                                                11
                                                                                                                                                                                                                                                                                                                                                #                                                                     4-6
                                                                                                                                                                                                                            #                                                               10                9
                                                                                                                                                                                                                                                                                                                                                                                                                      6-8
                                                                                                                                                #                                                                                                         #
                                                                              #                                        5                                                                                                                                                                                      #
                                                               1                                                                                     4                                                                                                                                                                             8
                                                                              5                                        #                                                                                                                                                              6
                                                               #
                                                                                 #                                                                                                                         10
                                                                                                                                                                                                            #
                                                                                                                                                                                                                                                      10
                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                      #                               8
                                                                                                                                                                                                                                                                                                                                    #
                                                                                                                                                                                                                                                                                                                                                                                                                      8 - 10
                                                                                                                                                                                                                                                                                                                  8
                                                                                                                                                                                                                                                                                                                          #
                                                                                                                                                                                                                                                                                                                                       9
                                                                                                                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                                                                                                                                                                                      10 - 12
                                                                                                                                                                                                                                                          9
                                                                                                                                                                  4                                                                                       #                                                   #
                                                                                                                                                                                                                                                                                                                                       #                                                                              12 - 14
                                                                                                                                                                                                                                         9                                                                                             8
                  Sites not pictured:                                                                                                  2
                                                                                                                                           #
                                                                                                                                                                  #
                                                                                                                                                                                                 9
                                                                                                                                                                                                 #
                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                                                                    #                 #
                                                                                                                                                                                                                                                                                                                                                          7                                                           14 - 16
                  Alaska 01           1 kg/ha                                                                                                                                       5
                                                                                                                                                                                                                                                                                                                                           11
                                                                                                                                                                                                                                                                                                                                                                                                                      16 - 18
                                                                                                                                                                                                                                                                                                                                             9
                                                                                                                                                                                                                                                                                                                                                                                                                      18 - 20
                                                                                                                                                                                    #
                  Alaska 03        < 1 kg/ha                                                                                                                                                                                                                                                                                               #

                  Virgin Islands 01 2 kg/ha                                                                                                                                                                                                                                                                                                               8                                                           > 20
                                                                                                                                                                                                                                                                                                                                                          #


                  National Atmospheric Deposition Program/National Trends Network




                                      Nitrate ion concentration (top) and wet deposition (bottom), 2000.


                                                                                                                                                                                                     6
                                  #
                                0.03
                                                                 #                                                                                                                                                                                                                                                                                  #
                          #
                                                               0.10                        #                                                                                                                                                                                                                                                     0.11
                      0.04                    0.14                                        0.31                                                              #
                                                  #
                                                                                                                     #
                                                                                                                                                        0.57                                   0.31                                                                                                                                          0.11
                      #                                                                                          0.35                                                        0.38                  #           #                                                                                                                              #
                     0.08                                             0.12                                                                       0.56
              #                                                          #                                                                                                        #   # 0.52
                  0.07                  #                                                                                                         #                            0.43 0.44                                                                                                                          0.27                 0.12
                  #                    0.05                                                                                                                              0.45     #                                                                                                                                          0.22      # 0.16
              0.01                                                                               0.26                                                                                      0.41                                                              #
                                                                                                                                                                                                                                                                                                                   #         #            #
                                                                                                   #
                                                                                                                                                                           #    #           #                                             0.18 #      # #
                                                                                  #                                                                                         0.51 #                                                            #         0.18 0.12
                        #                                                                                                                                                      # 0.54 # 0.47                                          0.39 0.18 0.24 0.40
                   0.09                                                          0.19                                                                                                            #
                                                                                                                                                                                                                                         #
                                              #                                                                                                    0.95                      0.54      0.51 #                                                        #     # 0.18
          #                                   0.20
                                                           #                                                                     0.61                                                            #                                   0.47              #        # 0.13
      0.08                                                0.32                                                                       #
                                                                                                                                                    #                    #                  0.460.44       #                           #    0.22 0.17 #
                                                                                      0.13                                                                             0.75              #               0.47               0.37 0.23           #
                                                                                                                                                                                                                                                  0.24 0.19
                                                                                          #
                                                                                          #
                                                                                                                                                                                         0.57 0.38                           #      #
                                                                                                                                                                                                                                                   #
                                                                                                                                                                                      #                                              0.26      #
                                                                 #                    0.09                                                                                          0.55
                                                                                                                                                                                                 #                              # #        0.23
0.05                                                           0.79 # 0.17                                                                                                                    0.50                           0.32 0.31
 #                                                                                                                                                                                    # # #                0.40 0.35                #
                                                                                                                                                                                                                                    #           # 0.22
   0.42                                                                                                   0.79                        0.65               0.67                          0.38 0.33 #             #     #                0.33
                                                                                                                                                                                                                                 0.32 #
      #               0.37                                                                                                                                          0.47                                                                  0.24      #
                          #                                                                           0.32 #                                 #              #         #         #
                                                                                                                                                                                                   0.44 0.40   # 0.23
                                                                                                                                                                                              #                                          #         0.11
                                                                                          0.11
                                                                                                           #
                                                                                                           #                                                                   0.42 0.36 0.40
                                                                                                                                                                                         #                     #
                                                                                                                                                                                                                       #                     # 0.21
                  #                                                      0.50                   # 0.12 0.30                                                                                             #                           0.20
              0.11                                                           #                  #                                                                                                        0.28 0.30                  #
                                                                                                 #      #                                                                         0.29                                  0.21        #
      #                                                                      #
                                                                                               0.09 0.27                             0.53                  #                        #        #                                                                                                                                                       +
    0.04                                                                 0.17
                                                                                                          0.37
                                                                                                                      0.57
                                                                                                                         #
                                                                                                                                         #
                                                                                                                                                          0.44             #
                                                                                                                                                                          0.35        0.27
                                                                                                                                                                                            0.28
                                                                                                                                                                                                        #       0.23
                                                                                                                                                                                                                          #
                                                                                                                                                                                                                             #
                                                                                                                                                                                                                                   0.17
                                                                                                                                                                                                                                                                                                                                       Ammonium as NH4
                                                                                                                                                               0.31
                                                                                  0.18
                                                                                      #                #                                                          #
                                                                                                                                                                                0.22     # 0.23
                                                                                                                                                                                           #
                                                                                                                                                                                                     0.26
                                                                                                                                                                                                            0.27
                                                                                                                                                                                                                   #       0.26             #
                                                                                                                                                                                                                                    0.32 0.23
                                                                                                                                                                                                                                                                                                                                           (mg/L)
                                                                                                                  #
                                                                                                                                                    #
                                                                                                                                                                                  #                           #             0.32      #
                                                                                                                                                                                                             # 0.19 #
                                                                                                                                 #                                                                                            #
                                                                                                                 0.30                                                                                                            0.21 #
                            #                                                                     #                            0.61               0.43              #     #           0.20                0.22 0.15 0.16
                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                   #
                                                                                                                                                                                                                                      0.48 0.11
                                                                                                                                                                                                                                               #
                                                                                                                                                                                                                                                                                                                                                                0.10
                          0.24                                                                  0.19                                                                0.24 0.19          #                          #
                                                                                                                                                       #                                                                       0.17
                                                                                                                                                                                                                                                                                                                                                              0.10 - 0.15
                                                                                                                                                                                                      #
                                                                 0.14
                                                                     #
                                                                                                                          #
                                                                                                                                                     0.26             0.16
                                                                                                                                                                        #
                                                                                                                                                                                    0.18
                                                                                                                                                                                     #             0.27 0.17
                                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                                                                                                                                              0.15 - 0.20
                                                                                                 0.28
                                                  0.20
                                                      #          0.17                                 #
                                                                                                                          0.45
                                                                                                                                                                                                                                               0.16
                                                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                   0.17
                                                                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                                                                                                                              0.20 - 0.25
                                                                                                                                                                         0.18                                      0.23
                                                                      #
                                                                                                                                                                             #                                         #
                                                                                                                                                                                                                                                 #                          0.13
                                                                                                                                                                                                                                                                              #
                                                                                                                                                                                                                                                                                      0.13
                                                                                                                                                                                                                                                                                                                                                              0.25 - 0.30
                                                                                                                                                                                                                   0.17                                                 0.12
                                                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                        #                                                                     0.30 - 0.35
                                                                                                                                                                                                                        #
                                                                                                                                  0.22
                                                                                                                                                                                                       0.12
                                                                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                      0.12                                                                    0.35 - 0.40
              Sites not pictured:                                                                              0.18
                                                                                                                                         #
                                                                                                                                                                 0.22                                      #                                                                                          0.10
              Alaska 01           0.01 mg/L
                                                                                                                     #                                             #                                                                                                                   #
                                                                                                                                                                                                                                                                                            0.12
                                                                                                                                                                                                                                                                                                      #                                                       0.40 - 0.45
              Alaska 03           0.03 mg/L
                                                                                                                                                      0.25
                                                                                                                                                        #
                                                                                                                                                                                                                                                                                            #
                                                                                                                                                                                                                                                                                             0.13                                                             0.45 - 0.50
              Virgin Islands 01 0.03 mg/L                                                                                                                                                                                                                                                                                                                     0.50 - 0.55
                                                                                                                                                                                                                                                                                                      0.09
                                                                                                                                                                                                                                                                                                          #                                                   > 0.55




                                  #
                                0.5
                                                                 #                                                                                                                                                                                                                                                                                  #
                          #
                                                               0.6                         #                                                                                                                                                                                                                                                      1.1
                      0.4                     0.7                                         0.8                                                               #
                                                  #
                                                                                                                     #
                                                                                                                                                        3.9                                    2.0                                                                                                                                           1.2
                      #                                                                                           1.1                                                            2.8               #           #                                                                                                                              #
                          1.2                                         0.3                                                                        3.5                              #                            3.1
              #                                                          #                                                                                                                          #
                  0.5                   #                                                                                                         #                                    3.2         3.0                                                                                                            2.9                    1.3
                  #
                                       0.3                                                                                                                               3.3               #                                                                                                                       #
                                                                                                                                                                                                                                                                                                                               2.7       #  1.7
                  0.2                                                                            0.7                                                                                                               3.2                                                                                                       #               # #
                                                                                                   #
                                                                                                                                                                             #         #                           #                                  #                                                           2.2    #           #
                                                                                  #                                                                                              3.5           #                                                                                                                        #              2.2 1.4
                        #                                                                                                                                                            #         4.6                 4.0                               2.3                                                  4.8
                                                                                 0.7                                                                                                                       #                   #                                                                                       2.2       3.0
                      0.2                     #                                                                                                                                   3.4                  5.4                                                                                                    #
                                                                                                                                                                                                                                                                                                                               #                 2.0
                                                           #                                                                                          4.0                                                          #
                                                                                                                                                                                                                                                #                                                       3.9                                  #      #
          #                                   0.4                                                                                2.6                                                                                                                                                                                        #                           1.7
                                                                                                                                                                                                                   3.6                                                                                              3.3 2.2 #
                                                                                                                                                        #
       0.2                                                0.7                                                                        #                                  #                                                                       3.8               #                                      #
                                                                                      0.5                                                                              4.7                                 #                                                      3.5                       4.0       1.9             #
                                                                                                                                                                                                                                                                                                                        3.1 2.2
                                                                                          #
                                                                                          #
                                                                                                                                                                                                           4.6              4.1                                                             #         #
                                                                                                                                                                                                                                                                                                                         # #
                                                                                                                                                                                                       #                                                                                            2.1
                                                                 #                    0.4                                                                                                          4.6
                                                                                                                                                                                                                               #                                                               # #      2.8
0.4                                                            3.0       #   0.3                                                                                                                                       3.8                                                                   3.5 3.0
#                                                                                                                                                                                                                           #      #       #                       3.6 3.1                        #
                                                                                                                                                                                                                                                                                                  #                      #   2.3
      2.0               0.2                                                                                    1.7                       2.8                     3.8                 3.4                                       3.8 3.2               #
                                                                                                                                                                                                                                                                        #     #                 2.8 3.6
                                                                                                                                                                                                                                                                                                     # 2.3                   #
      #                                                                                                1.1       #                           #                    #
                          #
                                                                                                           #
                                                                                                                                                                                     #                     #
                                                                                                                                                                                                                                           #         4.3 3.7 #                 2.5                            #                1.4
                                                                                                                                                                                                           3.3                 3.1                                                #                                 #    2.3
                  #                                                      0.6               0.8             #                                                                                                                       #       3.4                          #                              2.2
                                                                                                            1.2                                                                                                                                               #
                  1.4                                                        #                  # 0.6
                                                                                                #                                                                                                                                                                 3.2 3.1                             #
                                                                                                 #           #                                                                                                     3.2                                                  2.6                           #
      #                                                                      #
                                                                                                0.5        0.9                       2.3                          #                                                    #               #
                                                                           0.3                                           1.4             #                                                     #                                                                          #       1.8                                                                +
      0.1
                                                                                      #                #
                                                                                                           0.5           #
                                                                                                                                                                 2.8
                                                                                                                                                                        3.1
                                                                                                                                                                                               3.8                             3.2
                                                                                                                                                                                                                                           3.7
                                                                                                                                                                                                                                                              #    2.1      #
                                                                                                                                                                                                                                                                           2.2
                                                                                                                                                                                                                                                                                                                                       Ammonium as NH4
                                                                                                                                                                                                                                                          2.7        #
                                                                                  0.5
                                                                                                                  #
                                                                                                                                                       #
                                                                                                                                                                             #
                                                                                                                                                                                                               2.4
                                                                                                                                                                                                                   #
                                                                                                                                                                                                                                   #   2.6
                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                                2.4
                                                                                                                                                                                                                                                                 #          2.5     #
                                                                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                   3.5 2.3                                                 (kg/ha)
                                                                                                                                                                                                                                                                # 2.7 #
                                                                                                                                 #                                                                                                                                           #
                                                                                                                 1.1                               3.5                                                                                                                          2.3 #       #
                            #                                                                     #                             2.8                                                                                                                           2.8 1.8 2.8
                                                                                                                                                                                                                                                                   #
                            1.4                                                                  0.7
                                                                                                                                                                                 #
                                                                                                                                                                                  2.9 1.7
                                                                                                                                                                                               #                               2.1
                                                                                                                                                                                                                               #                                    #
                                                                                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                                                                     5.0   1.7                                                                  0.5
                                                                                                                                                            #
                                                                                                                                                           2.7                         1.9                              2.2                               #
                                                                                                                                                                                                                                                                                                1.7
                                                                                                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                                                                                                                                              0.5 - 1.0
                                                                     0.3                                                                                                                                                                             2.8
                                                  0.3
                                                                     #                            1.3
                                                                                                                          #
                                                                                                                          1.4
                                                                                                                                                                                           #                               #                                          1.6
                                                                                                                                                                                                                                                                        #                                                                                     1.0 - 1.5
                                                                                                                                                                                                                                                                                      1.6
                                                      #          0.9
                                                                      #
                                                                                                      #
                                                                                                                                                                            2.3                                        2.5
                                                                                                                                                                                                                                               1.2
                                                                                                                                                                                                                                                 #                          1.5
                                                                                                                                                                                                                                                                                       #                                                                      1.5 - 2.0
                                                                                                                                                                                                                                                                                                                                                              2.0 - 2.5
                                                                                                                                                                             #                                         #
                                                                                                                                                                                                                                                                              #
                                                                                                                                                                                                                                                                                       1.2
                                                                                                                                                                                                                                                                        1.2             #

                                                                                                                                     1.3
                                                                                                                                                                                                                       1.8
                                                                                                                                                                                                                        #                                               #
                                                                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                                                                                              2.5 - 3.0
              Sites not pictured:                                                                                0.6
                                                                                                                                         #
                                                                                                                                                                  2.4                                  1.4
                                                                                                                                                                                                           #
                                                                                                                                                                                                                                                                                       1.1
                                                                                                                                                                                                                                                                                                      0.9                                                     3.0 - 3.5
                                                                                                                                                                   #                                                                                                                                  #
              Alaska 01           0.1 kg/ha
                                                                                                                     #
                                                                                                                                                      1.9
                                                                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                                                            1.2                                                               3.5 - 4.0
              Alaska 03           0.1 kg/ha                                                                                                             #
                                                                                                                                                                                                                                                                                            #
                                                                                                                                                                                                                                                                                                1.2
                                                                                                                                                                                                                                                                                                                                                              4.0 - 4.5
              Virgin Islands 01 0.2 kg/ha                                                                                                                                                                                                                                                             1.3
                                                                                                                                                                                                                                                                                                                                                              > 4.5
                                                                                                                                                                                                                                                                                                          #


              National Atmospheric Deposition Program/National Trends Network




                      Ammonium ion concentration (top) and wet deposition (bottom), 2000.


                                                                                                                                                                        7
                                  #
                                0.03
                                                                 #                                                                                                                                                                                                                                                       #
                          #
                                                               0.06                        #                                                                                                                                                                                                                      0.08
                      0.03                    0.05                                        0.16                                                              #
                                                  #
                                                                                                                     #
                                                                                                                                                        0.17                                  0.16                                                                                                              0.04
                      #                                                                                          0.21                                                       0.19               #          #                                                                                                         #
                     0.04                                             0.12                                                                       0.24
              #                                                          #                                                                                                       #    # 0.22
                  0.04                  #                                                                                                         #                             0.19 0.17                                                                                                 0.10                 0.05
                  #
                                       0.04                                                                                                                            0.14        #                                                                                                                 0.07      # 0.05
              0.02                                                                               0.22                                                                                      0.23                                                              #
                                                                                                                                                                                                                                                                                           #         #          #
                                                                                                   #
                                                                                                                                                                            #    #         #                                             #0.07 #        #
                                                                                  #                                                                                          0.23 #                                                           #         0.06 0.06
                        #                                                                                                                                                       # 0.26 # 0.26   #
                                                                                                                                                                                                                                       0.22
                                                                                                                                                                                                                                      0.18 0.08 0.12
                   0.04                                                          0.21                                                                                                                                                    #
                                              #
                                                           #                                                                                       0.39                       0.29     0.26 #                                                       #      # 0.09
          #                                   0.17                                                                               0.24                                                            #                                   0.16              #        # 0.11
      0.03                                                0.15                                                                       #
                                                                                                                                                    #           #                           0.260.23       #                           #    0.07 0.06 #
                                                                                      0.22                                                                    0.33              #                        0.22               0.15 0.08           #
                                                                                                                                                                                                                                                  0.10 0.07
                                                                                          #
                                                                                          #
                                                                                                                                                                               0.34 0.26                                     #      #
                                                                                                                                                                                                                                               # #
                                                                                                                                                                             #                                                       0.10
                                                                 #                    0.18                                                                                 0.50
                                                                                                                                                                                       #                                        # #        0.09
0.03                                                           0.30 # 0.21                                                                                                          0.31                                     0.14 0.12
 #                                                                                                                                                                                    # # #                0.24 0.15                #
                                                                                                                                                                                                                                    #           # 0.09
   0.05               0.07                                                                                0.34                        0.22               0.43       0.47               0.23 0.28 #             #     #           0.13 0.09
                                                                                                                                                                                                                                       # 0.09      #
      #                                                                                               0.23 #                                 #              #
                          #                                                                                                                                           #         #
                                                                                                                                                                                              #    0.24 0.21# 0.15                       #         0.08
                                                                                                           #
                                                                                                                                                                               0.32 0.22 0.25                          #                     # 0.08
                  #                                                      1.27             0.17             #                                                                             #
                                                                                                                                                                                                        #
                                                                                                                                                                                                               #                    0.06
                                                                                                # 0.20 0.18
              0.03                                                           #                  #                                                                                                        0.15 0.17                  #
                                                                                                 #      #                                                                         0.18                                  0.11        #
      #                                                                      #
                                                                                               0.09 0.20                             0.49                  #                        #        #
    0.03                                                                 0.38                                         0.45               #
                                                                                                                                                          0.47             #
                                                                                                                                                                                            0.20
                                                                                                                                                                                                                          #        0.06
                                                                                                          0.25           #                                                0.29        0.17              #       0.15         #
                                                                                                                                                               0.32                                                        0.11
                                                                                      #                #                                                                                             0.13                                                                                                                                +
                                                                                                                                                                                                                                                                                                                                 Ca2
                                                                                                                                                                  #                      # 0.14                    #                        #
                                                                                  0.37                                                                                          0.16                        0.15                    0.06 0.07
                                                                                                                  #                                                               #        #                  #             0.09      #
                                                                                                                                                    #
                                                                                                                                                                                                             # 0.08 #
                                                                                                                                 #                                                                                            #
                                                                                                                 0.27                                                                                                            0.07 #
                                                                                                                                                                                                                                                                                                                                (mg/L)
                                                                                                                                                                                                                                               #
                            #                                                                     #                            0.43               0.37                                0.12                       #      0.06
                                                                                                                                                                    #     #                               0.10 0.06                #
                                                                                                                                                                                                                                      0.08 0.07
                          0.04                                                                  0.22                                                                0.19 0.16          #                          #
                                                                                                                                                       #                                                                       0.09
                                                                 0.17                                                     #
                                                                                                                                                     0.30             0.13
                                                                                                                                                                        #
                                                                                                                                                                                    0.10
                                                                                                                                                                                     #
                                                                                                                                                                                                      #
                                                                                                                                                                                                   0.10 0.07
                                                                                                                                                                                                                                 #                                                                                                    0.10
                                                  0.46
                                                      #          0.15
                                                                     #                           0.37
                                                                                                      #
                                                                                                                          0.60
                                                                                                                                                                                                                                  0.09
                                                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                                               0.07                                                                 0.10 - 0.15
                                                                      #                                                                                                0.18
                                                                                                                                                                            #
                                                                                                                                                                                                              0.12
                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                   #                    0.06
                                                                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                                                                                                                    0.15 - 0.20
                                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                0.10
                                                                                                                                                                                                              0.09                                  0.07         #                                                                  0.20 - 0.25
                                                                                                                                  0.54
                                                                                                                                                                                                   0.10
                                                                                                                                                                                                                  #                                 #
                                                                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                                                0.11
                                                                                                                                                                                                                                                                                                                                    0.25 - 0.30
              Sites not pictured:                                                                              0.20
                                                                                                                                         #
                                                                                                                                                                0.20                                  #                                                                       0.17                                                  0.30 - 0.35
                                                                                                                                                                  #                                                                                              #            #
              Alaska 01           0.02 mg/L                                                                          #
                                                                                                                                                                                                                                                                     0.13
                                                                                                                                                      0.28                                                                                                                                                                          0.35 - 0.40
              Alaska 03           0.03 mg/L                                                                                                             #                                                                                                              0.13
                                                                                                                                                                                                                                                                                                                                    > 0.40
                                                                                                                                                                                                                                                                      #

              Virgin Islands 01 0.19 mg/L
                                                                                                                                                                                                                                                                              0.13
                                                                                                                                                                                                                                                                                  #




                                  #
                                0.4
                                                                 #                                                                                                                                                                                                                                                       #
                          #
                                                               0.4                         #                                                                                                                                                                                                                            0.7
                      0.2                     0.2                                         0.4                                                               #
                                                  #
                                                                                                                     #
                                                                                                                                                        1.2                                   1.0                                                                                                                0.5
                      #                                                                                           0.7                                                        1.4               #          #                                                                                                         #
                          0.5                                         0.3                                                                        1.4                             #                        1.3
              #                                                          #                                                                                                                      #
                  0.3                   #                                                                                                         #                                  1.4          1.2                                                                                     1.1                  0.5
                  #                    0.2                                                                                                                             1.0                #                                                                                                          0.9       # 0.6
                  0.4                                                                            0.6                                                                                                          1.8                                                                          #         #          # #
                                                                                                   #
                                                                                                                                                                            #         #                       #                          #                                                0.9    #         #
                                                                                  #                                                                                             1.6           #                                                                                                 #              0.7 0.7
                        #                                                                                                                                                         #           2.2             2.2                      1.3                                        2.2
                                                                                 0.7                                                                                                                  #               #                                                                        1.0       1.5
                      0.1                     #                                                                                                                                  1.8                2.7                                                                               #                #             0.9
                                                           #                                                                                          1.6                                                     #
                                                                                                                                                                                                                                   #                                            1.3                              #       #
          #                                   0.4                                                                                1.0                                                                                                                                                                #                         1.5
       0.1                                                0.3                                                                        #
                                                                                                                                                        #              #                                      2.1                  2.0        #                                  #          1.1 0.7 #
                                                                                      0.9                                                                             2.0                               #                                     1.6                    1.7      0.7             #
                                                                                                                                                                                                                                                                                                1.3 0.9
                                                                                          #
                                                                                          #
                                                                                                                                                                                                        2.7           2.9                                             #       #
                                                                                                                                                                                                                                                                                                 # #
                                                                                                                                                                                                  #                                                                          0.8
                                                                 #                    0.8                                                                                                      4.2
                                                                                                                                                                                                                      #                                                 # #      1.2
0.3                                                            1.1       #   0.4                                                                                                                                  2.3                                                 1.5 1.2
#                                                                                                                                                                                                                     #   #   #                2.3 1.4                     #
                                                                                                                                                                                                                                                                           #                     #   0.9
      0.2             < 0.1                                                                                    0.7                       1.0                    2.5              3.4                                   2.3 2.7         #
                                                                                                                                                                                                                                                    #    #               1.1 1.0
                                                                                                                                                                                                                                                                              # 0.9                  #
      #                                                                                                0.8       #                           #                   #
                          #
                                                                                                           #
                                                                                                                                                                                  #
                                                                                                                                                                                        1.9        2.4 1.9 # 1.7
                                                                                                                                                                                                        #
                                                                                                                                                                                                                    #         #        #        1.0
                                                                                                                                                                              2.5             2.2                                         # 0.8
                  #                                                      1.5               1.2             #                                                                              #
                                                                                                                                                                                                       #
                                                                                                                                                                                                            #                      0.6
                                                                             #                  # 1.0
                                                                                                #           0.7                                                                                          1.7 1.7                  #
                  0.4                                                                            #           #                                                                   1.9
      #                                                                      #
                                                                                                0.5        0.7                       2.1                  #                         #        #                        1.3         #
      0.1                                                                  0.7                                           1.1             #
                                                                                                                                                          3.0              #
                                                                                                                                                                                             2.6
                                                                                                                                                                                                                        #        0.7
                                                                                                           0.3           #                                                3.1          2.0             #      1.4          #
                                                                                      #                #
                                                                                                                                                              3.2                                                        1.0
                                                                                                                                                                #                        # 1.6       1.3        #                        #
                                                                                                                                                                                                                                                                                                                                        +
                                                                                                                                                                                                                                                                                                                                Ca2
                                                                                  1.1                                                                                          1.8                         1.3                     0.6 0.7
                                                                                                                  #                                                              #          #               #              0.7      #
                                                                                                                                                    #
                                                                                                                                                                                                           # 1.2 #
                                                                                                                                 #                                                                                          #
                                                                                                                 1.0                               3.0                                                                         0.7 #        #
                                                                                                                                2.0                                                                           #       1.0
                            #
                            0.2
                                                                                                  #
                                                                                                 0.8
                                                                                                                                                                   #     #
                                                                                                                                                                    2.2 1.4
                                                                                                                                                                                       1.2
                                                                                                                                                                                        #
                                                                                                                                                                                                         1.3 0.7
                                                                                                                                                                                                               #
                                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                     0.8   1.1                                                                                 (kg/ha)
                                                                                                                                                       #                                                                     0.9
                                                                                                                                                                                                     #
                                                                     0.3
                                                                     #
                                                                                                                          #
                                                                                                                                                      3.1             1.6
                                                                                                                                                                       #
                                                                                                                                                                                    1.3
                                                                                                                                                                                     #             1.0     0.7
                                                                                                                                                                                                                              #
                                                                                                                                                                                                                                                                                                                                  1.00
                                                                                                 1.7                                                                                                        #
                                                  0.7
                                                      #          0.8                                  #
                                                                                                                          1.9
                                                                                                                                                                                               0.7                    0.6
                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                                                                1.00 - 1.25
                                                                      #                                                                                         2.2                1.3           #
                                                                                                                                                                 #                 #                           0.7
                                                                                                                                                                                                                  #
                                                                                                                                                                                                                       1.0
                                                                                                                                                                                                                                                                                                                                1.25 - 1.50
                                                                                                                                                                                  1.0                        0.7
                                                                                                                                                                                                             #
                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                                                                1.50 - 1.75
                                                                                                                                                                                                                  #
                                                                                                                                     3.0
                                                                                                                                         #                                                          1.1
                                                                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                                                 1.0                                                            1.75 - 2.00
              Sites not pictured:                                                                                0.6                                             2.2                                  #                                                                       1.4
              Alaska 01          0.1 kg/ha
                                                                                                                     #                                            #                                                                                              #
                                                                                                                                                                                                                                                                      1.3
                                                                                                                                                                                                                                                                              #                                                 2.00 - 2.25
                                                                                                                                                      2.1
              Alaska 03          0.1 kg/ha                                                                                                              #
                                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                        1.3                                                     2.25 - 2.50
              Virgin Islands 01 1.3 kg/ha                                                                                                                                                                                                                                                                                       > 2.50
                                                                                                                                                                                                                                                                              1.9
                                                                                                                                                                                                                                                                                  #


              National Atmospheric Deposition Program/Nationals Trends Network




                            Calcium ion concentration (top) and wet deposition (bottom), 2000.


                                                                                                                                                                       8
                                 #
                                14
                                                                  #                                                                                                                                                                                                                                                                                  #
                          #
                                                                  7                         #                                                                                                                                                                                                                                                  11
                       19                      8                                           23                                                                    #
                                                   #
                                                                                                                       #
                                                                                                                                                               26                                     18                                                                                                                                     11
                      #                                                                                                29                                                            25               #        #                                                                                                                                #
                           29                                             12                                                                          36                              #                         28
              #                                                            #                                                                                                                           #
                  41                    #                                                                                                              #                                  23           20                                                                                                         14                    10
                  #
                                        6                                                                                                                                   22                #                                                                                                                                10       #       13
                  13                                                                              25                                                                                                                29                                                                                             #         #              # #
                                                                                                      #
                                                                                                                                                                                #         #                        #                                 #                                                            11     #          #
                                                                                   #                                                                                                 31           #                                                                                                                     #               10          62
                       #                                                                                                                                                                  #       35                   36                            33                                                    26
                                                                                   21                                                                                                                      #                   #                                                                                        12         20
                       5                      #                                                                                                                                       32                   31                                                                                                 #                #                    40
                                                            #                                                                                              41                                                      #
                                                                                                                                                                                                                                                #                                                       21                                  #        #
          #                                   17                                                                                       22                    #                                                      27                                                                                                       18     #                    179
          4                                                16                                                                             #                                 #                                                                   38               #                                       #          12           #
                                                                                        22                                                                                 39                               #                                                    37                        21         11                 #
                                                                                                                                                                                                                                                                                                                             20 31
                                                                                           #
                                                                                           #
                                                                                                                                                                                                               38           34                                                             #          #
                                                                                                                                                                                                                                                                                                                         # #
                                                                                                                                                                                                       #                                                                                                13
                                                                  #                     17                                                                                                            72
                                                                                                                                                                                                                               #                                                                #     #      15
37                                                               35       #    20                                                                                                                                       46                                                                  19       17
#                                                                                                                                                                                                                           #      #       #                      38          22                      #
                                                                                                                                                                                                                                                                                                      #                  #
                                                                                                                                                                                                                                                                                                                             27
     27                                                                                                         32                            20                     33                                                         43 48                                 #       #                     19 # 14
      #                    9                                                                                                                                                             35                                                          #                                                      17                #
                          #                                                                               22       #                              #                   #                   #                 #
                                                                                                                                                                                                                                                     34               #        20
                                                                                                           #                                                                                                                    26         #
                                                                                                                                                                                                                                                                 30               #
                                                                                                                                                                                                                                                                                                              #               114
                                                                                                                                                                                                               35                          39                                                                       #    21
                  #                                                        93               17             #                                                                                                                       #
                                                                                                                                                                                                                                                             #
                                                                                                                                                                                                                                                                      #                               11
                                                                              #                 # 20
                                                                                                #              18                                                                                                                                                20       21                          #
                  8                                                                              #             #                                                                                                    19
     #                                                                         #
                                                                                                  9        22                             44                         #                                                 #               #                                              14              #
                                                                                                                                                                                                                                                                                       #              13
                                                                              48                                           32                                                                     #
                                                                                                                                                                                                                                                                                                                                                                    +
                                                                                                                                                                                                                                                                                                                                                                Mg2
                                                                                                                                              #
     41                                                                                                                                                              33                                                                    24
                                                                                                           21              #                                                                      29                           23                            #       17   #
                                                                                       #               #
                                                                                                                                                                            22                                                                                           16
                                                                                                                                                                                #                                                  #
                                                                                                                                                                                                                                       23                17            #             #
                                                                                                                                                                                                                26                                                21
                                                                                    32
                                                                                                                    #
                                                                                                                                                           #
                                                                                                                                                                                                                   #                   #                           #      19
                                                                                                                                                                                                                                                                                17 25
                                                                                                                                                                                                                                                                                 #                                                                             (µg/L)
                                                                                                                                                                                                                                                                  # 14 #
                                                                                                                                      #                                                                                                                                    #
                                                                                                                   19                                      28                                                                                                                20 #      #
                                                                                                                                     30                                                                                                                          26 12 8
                           #                                                                      #                                                                                                                                                                  #
                                                                                                                                                                                     #            #                            22                                             #        71
                           23                                                                     15                                                                                     18       23                           #                                          #       26                                                                             15
                                                                      15                                                                                       31
                                                                                                                                                                 #
                                                                                                                                                                                          22                            24                               #
                                                                                                                                                                                                                                                                                               25
                                                                                                                                                                                                                                                                                                #                                                              15 - 20
                                                                                                                                                                                              #                                                      25              17
                                                   58
                                                                      #                           22
                                                                                                                            #
                                                                                                                                32
                                                                                                                                                                                                                           #
                                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                      25
                                                                                                                                                                                                                                                                                                                                                               20 - 25
                                                                      13                              #                                                                                                                                        32
                                                       #
                                                                       #                                                                                                        29                                     33
                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                #                         19
                                                                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                                                                                                                               25 - 30
                                                                                                                                                                                 #

                                                                                                                                                                                                                                                                      32
                                                                                                                                                                                                                                                                              #
                                                                                                                                                                                                                                                                                       31
                                                                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                                                                                                                               30 - 35
                                                                                                                                                                                                                       36
                                                                                                                                          31                                                                           #                                              #
                                                                                                                                                                                                                                                                                       #                                                                       35 - 40
                                                                                                                                                                                                          42                                                                           35
              Sites not pictured:                                                                                  10
                                                                                                                                              #
                                                                                                                                                                      56
                                                                                                                                                                      #
                                                                                                                                                                                                           #
                                                                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                                                                      105
                                                                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                                                                                               40 - 45
                                                                                                                       #
              Alaska 01           3 µg/L                                                                                                                   55
                                                                                                                                                                                                                                                                                            60                                                                 45 - 50
                                                                                                                                                                                                                                                                                             43
              Alaska 03           4 µg/L                                                                                                                     #
                                                                                                                                                                                                                                                                                           #                                                                   50 - 55
              Virgin Islands 01 221 µg/L                                                                                                                                                                                                                                                                                                                       > 55
                                                                                                                                                                                                                                                                                                      56
                                                                                                                                                                                                                                                                                                          #




                                 #
                                0.22
                                                                  #                                                                                                                                                                                                                                                                                  #
                          #
                                                                0.04                        #                                                                                                                                                                                                                                                   0.10
                      0.16                    0.04                                         0.06                                                                  #
                                                   #
                                                                                                                       #
                                                                                                                                                             0.18                                 0.12                                                                                                                                      0.12
                      #                                                                                            0.09                                                          0.18                 #        #                                                                                                                                #
                     0.45                                             0.03                                                                            0.22
              #                                                            #                                                                                                          #   # 0.17
                  0.30                  #                                                                                                              #                           0.17 0.14                                                                                                                      0.15                  0.11
                  #                    0.03                                                                                                                                 0.16      #                                                                                                                                       0.12       # 0.14
              0.24                                                                                0.07                                                                                         0.23                                                           #
                                                                                                                                                                                                                                                                                                                   #          #             #
                                                                                                      #
                                                                                                                                                                               #    #          #                                           0.13 #    #   #
                                                                                   #                                                                                            0.21 #                                                         #         0.12 0.75
                       #                                                                                                                                                           # 0.30 # 0.30                                                    0.19
                                                                                                                                                                                                                                       0.32 0.15 0.25
                   0.01                                                           0.07                                                                                                              #
                                                                                                                                                                                                                                          #
                                              #
                                                            #                                                                                           0.17                     0.20     0.33 #                                                     #      # 0.44
          #                                   0.04                                                                                    0.10                                                           #                                0.17              #        # 2.41
     0.01                                                  0.04                                                                           #
                                                                                                                                                         #                  #                  0.21 0.32      #                         #    0.18 0.24 #
                                                                                       0.09                                                                               0.24               #              0.27             0.23 0.09           #
                                                                                                                                                                                                                                                   0.26 0.37
                                                                                           #
                                                                                           #
                                                                                                                                                                                            0.30 0.37                         #      #
                                                                                                                                                                                                                                                # #
                                                                                                                                                                                          #                                           0.11
                                                                  #                    0.08                                                                                             0.60
                                                                                                                                                                                                    #                            # #        0.19
0.29                                                            0.13 # 0.04                                                                                                                      0.35                         0.21 0.16
 #                                                                                                                                                                                        # # #               0.35 0.19              #
                                                                                                                                                                                                                                     #           # 0.27
   0.13                0.01                                                                               0.07                            0.09               0.19        0.25              0.44 0.47 #            # #             0.16 0.15
                                                                                                                                                                                                                                        # 0.16      #
      #                                                                                               0.08 #                                      #             #
                          #                                                                                                                                                #        #                             # 0.22
                                                                                                                                                                                                  #    0.33 0.28                          #         1.44
                                                                                                           #
                                                                                                                                                                                   0.27 0.23 0.34                       #                     # 0.23
                  #                                                       0.11             0.12            #                                                                                 #
                                                                                                                                                                                                           #
                                                                                                                                                                                                                  #                  0.12
                                                                                                # 0.10 0.07
              0.11                                                            #                 #                                                                                                            0.23 0.21               #
                                                                                                 #      #                                                                             0.21                               0.17        #
     #                                                                         #
                                                                                                0.05 0.08                                 0.19                 #                        #        #
                                                                           0.09                                         0.08                  #                                #                                           #       0.14
     0.15                                                                                                                                                     0.21                              0.31                                                                                                                                                                +
                                                                                       #               #
                                                                                                          0.03              #
                                                                                                                                                                   0.22
                                                                                                                                                                      #
                                                                                                                                                                              0.31        0.28
                                                                                                                                                                                             # 0.26
                                                                                                                                                                                                           #
                                                                                                                                                                                                         0.18
                                                                                                                                                                                                                   0.15
                                                                                                                                                                                                                      #
                                                                                                                                                                                                                              #
                                                                                                                                                                                                                            0.14             #
                                                                                                                                                                                                                                                                                                                                                                Mg2
                                                                                   0.10                                                                                             0.29                       0.19                  0.19 0.25
                                                                                                                    #
                                                                                                                   0.07               #                  #
                                                                                                                                                                                      #        #                 #
                                                                                                                                                                                                                # 0.20 #
                                                                                                                                                                                                                             0.15
                                                                                                                                                                                                                               #
                                                                                                                                                                                                                                 0.21 #
                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                #
                                                                                                                                                                                                                                                                                                                                                               (kg/ha)
                                                                                                                                                       0.23
                                                                                                                                     0.14                                                                    0.34 0.14 0.14
                           #                                                                      #                                                                                                                 #
                                                                                                                                                                        #     #           0.23                                      #
                                                                                                                                                                                                                                       0.27 1.10
                          0.13                                                                   0.05                                                                   0.21 0.20          #                         #
                                                                                                                                                                                                                                                                                                                                                                 0.15
                                                                                                                                                                                                                                                                                               0.25
                                                                                                                                                                                                                                                                                                                                                               0.15 - 0.20
                                                                                                                                                                 #
                                                                                                                                                                                          0.27                                                           #
                                                                  0.03                                                                                       0.33                                                      0.29                                                                     #
                                                                                                                            #                                                                 #                            #                        0.26          0.17
                                                  0.08
                                                                  0.07
                                                                      #                           0.10
                                                                                                      #
                                                                                                                            0.10                                                                                                                                      #
                                                                                                                                                                                                                                                                                   0.24                                                                        0.20 - 0.25
                                                       #                                                                                                                                                                                       0.25
                                                                       #                                                                                                    0.36
                                                                                                                                                                                 #
                                                                                                                                                                                                                    0.36
                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                #                         0.21
                                                                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                                                                                                                               0.25 - 0.30
                                                                                                                                                                                                                                                                              #
                                                                                                                                                                                                                                                                      0.33
                                                                                                                                                                                                                                                                                      0.30
                                                                                                                                                                                                                                                                                       #                                                                       0.30 - 0.35
                                                                                                                                                                                                                    0.37
                                                                                                                                       0.18                                                                             #                                             #
                                                                                                                                                                                                                                                                                       #                                                                       0.35 - 0.40
                                                                                                                                              #                                                           0.49                                                                        0.33
              Sites not pictured:                                                                               0.03                                                 0.62
                                                                                                                                                                      #
                                                                                                                                                                                                           #
                                                                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                                                                     0.87
                                                                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                                                                                               0.40 - 0.45
                                                                                                                       #
              Alaska 01         0.01 kg/ha                                                                                                                 0.41
                                                                                                                                                                                                                                                                                           0.60
                                                                                                                                                                                                                                                                                                                                                               0.45 - 0.50
                                                                                                                                                                                                                                                                                             0.42
              Alaska 03         0.01 kg/ha                                                                                                                   #
                                                                                                                                                                                                                                                                                           #
                                                                                                                                                                                                                                                                                                                                                               0.50 - 0.55
              Virgin Islands 01 1.56 kg/ha                                                                                                                                                                                                                                                                                                                     > 0.55
                                                                                                                                                                                                                                                                                                      0.82
                                                                                                                                                                                                                                                                                                          #


              National Atmospheric Deposition Program/National Trends Network




                  Magnesium ion concentration (top) and wet deposition (bottom), 2000.


                                                                                                                                                                            9
                                  #
                                 124
                                                               #                                                                                                                                                                                                                                                                                      #
                           #
                                                               25                        #                                                                                                                                                                                                                                                         74
                       166                   31                                          24                                                                  #
                                                 #
                                                                                                                      #
                                                                                                                                                            19                                      21                                                                                                                                       71
                       #                                                                                              36                                                          22                #         #                                                                                                                                #
                     267                                                19                                                                        34                               #                          34
              #                                                         #                                                                                                                            #
                  367                  #                                                                                                           #                                    32           22                                                                                                             30                    63
                  #                    24                                                                                                                                 23                #                                                                                                                                   25       #       79
                  129                                                                            40                                                                                                               24                                                                                                 #         #             # #
                                                                                                    #
                                                                                                                                                                              #         #                         #                                  #                                                              24     #         #
                                                                                 #                                                                                                39            #                                                                                                                         #              46 561
                        #                                                                                                                                                              #        36                    33                             32                                                       47
                                                                                 49                                                                                                                       #                   #                                                                                           28        52
                       16                    #                                                                                                                                     47                    33                                                                                                     #               #                309
                                                         #                                                                                              47                                                        #
                                                                                                                                                                                                                                               #                                                          39                                 #        # 1660
          #                                  315                                                                                  43                                                                                                                                                                                          #
       15                                                44                                                                           #
                                                                                                                                                        #                #                                        31                            49               #                                         #          47 129 #
                                                                                       30                                                                                39                               #                                                      36                          36         28              #
                                                                                                                                                                                                                                                                                                                          103 237
                                                                                         #                                                                                                                   37            54                                                                #          #
                                                                                         #                                                                                                           #                                                                                                     31             # #
                                                                #                      51                                                                                                           50
                                                                                                                                                                                                                              #                                                                   #      #      72
349                                                          257        #    45                                                                                                                                        54                                                                     42        38
#                                                                                                                                                                                                                          #      #       #                       63           43                       #
                                                                                                                                                                                                                                                                                                        #                  #   161
   171                                                                                                        48                          47                      76                                                           71 54                                   #       #                       41 # 51
      #                    38                                                                                                                                                         57                                                             #                                                         73              #
                           #                                                                            35        #                           #                    #                   #                  #
                                                                                                                                                                                                                                                     57                #        40
                                                                                                          #                                                                                                                    58         #
                                                                                                                                                                                                                                                                 55                #
                                                                                                                                                                                                                                                                                                                #            997
                                                                                          32              #                                                                                                  70                   #        62                          #
                                                                                                                                                                                                                                                                                                                     #    138
                  #                                                      90                                   25                                                                                                                                             #                                           49
                  49                                                        #                  # 31
                                                                                               #                                                                                                                                                                 53        48                           #
                                                                                                #             #                                                                                                   66                                                                   39               #
      #                                                                     #
                                                                                               26         35                          110                          #                                                  #               #
                                                                                                                                                                                                                                                                                                        70
      390                                                                   41                                            58              #
                                                                                                                                                                   88                           #
                                                                                                                                                                                                                                          76
                                                                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                                                                                                   +
                                                                                     #               #
                                                                                                         86               #
                                                                                                                                                                         63
                                                                                                                                                                              #
                                                                                                                                                                                                90                         101
                                                                                                                                                                                                                                  #                      72
                                                                                                                                                                                                                                                             #       43
                                                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                                                          #
                                                                                                                                                                                                                                                                         41                                                                                     Na
                                                                                                                                                                                                              111                     113                                           #
                                                                                  62
                                                                                                                   #
                                                                                                                                                        #
                                                                                                                                                                                                                  #                   #
                                                                                                                                                                                                                                                                  88
                                                                                                                                                                                                                                                                   #      82
                                                                                                                                                                                                                                                                               121 175
                                                                                                                                                                                                                                                                                #                                                                              (µg/L)
                                                                                                                                                                                                                                                                  # 55 #
                                                                                                                                  #                                                                                                                                        #
                                                                                                                  39                               118                                                                                                                       134 #     #
                            #                                                                   #                                72                                                             #                          133                                   59 71 41
                                                                                                                                                                                                                                                                     #
                                                                                                                                                                                                                                                                                 191 661
                                                                                                                                                                                                                                                                              #
                                                                                                                                                                                                                                                                                                                                                                  50
                                                                                                                                                                                  #
                           201                                                                  30                                                                                    95 106                                  #                                            #


                                                                                                                                                        137
                                                                                                                                                            #
                                                                                                                                                                                        127                           147                                #
                                                                                                                                                                                                                                                                                                 184
                                                                                                                                                                                                                                                                                                   #                                                            50 - 100
                                                                   57                                                                                                                                                                               161
                                                 333
                                                                    #                            52
                                                                                                                           #
                                                                                                                           104
                                                                                                                                                                                            #                             #                                       112
                                                                                                                                                                                                                                                                       #                                                                                        100 - 150
                                                                   90                                #                                                                                                                                                                                 194
                                                     #
                                                                    #                                                                                                     167                                         246
                                                                                                                                                                                                                                              259
                                                                                                                                                                                                                                                #                          149
                                                                                                                                                                                                                                                                                        #                                                                       150 - 200
                                                                                                                                                                              #                                       #
                                                                                                                                                                                                                                                                               #
                                                                                                                                                                                                                                                                                        237                                                                     200 - 250
                                                                                                                                                                                                                                                                       235               #

                                                                                                                                   170
                                                                                                                                                                                                                  283
                                                                                                                                                                                                                       #                                               #
                                                                                                                                                                                                                                                                                         #                                                                      250 - 300
              Sites not pictured:                                                                                 42
                                                                                                                                          #
                                                                                                                                                                   465                               352
                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                        284
                                                                                                                                                                                                                                                                                                        980                                                     300 - 350
                                                                                                                                                                    #
              Alaska 01            9 µg/L                                                                             #                                                                                                                                                                 #
                                                                                                                                                                                                                                                                                             484
                                                                                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                                                                                                350 - 400
                                                                                                                                                       439
              Alaska 03           16 µg/L                                                                                                               #
                                                                                                                                                                                                                                                                                             #
                                                                                                                                                                                                                                                                                                 324
                                                                                                                                                                                                                                                                                                                                                                400 - 450
              Virgin Islands 01 1987 µg/L                                                                                                                                                                                                                                                                                                                       > 450
                                                                                                                                                                                                                                                                                                        458
                                                                                                                                                                                                                                                                                                            #




                                  #
                                 2.0
                                                               #                                                                                                                                                                                                                                                                                      #
                           #
                                                              0.2                        #                                                                                                                                                                                                                                                         0.7
                       1.4                   0.1                                         0.1                                                                 #
                                                 #
                                                                                                                      #
                                                                                                                                                        0.1                                     0.1                                                                                                                                          0.8
                       #                                                                                           0.1                                                            0.2               #         #                                                                                                                                #
                           4.1                                      0.1                                                                           0.2                              #                          0.2
              #                                                         #                                                                                                                            #
                  2.7                  #                                                                                                           #                                    0.2         0.2                                                                                                             0.3                  0.7
                  #
                                       0.1                                                                                                                                0.2               #                                                                                                                        #
                                                                                                                                                                                                                                                                                                                               0.3       #  0.9
                  2.4                                                                           0.1                                                                                                               0.2                                                                                                          #             # #
                                                                                                    #
                                                                                                                                                                              #         #                         #                                  #                                                              0.3    #         #
                                                                                 #                                                                                                0.3           #                                                                                                                         #              0.6 6.8
                        #                                                                                                                                                              #        0.3               0.3                               0.2                                                       0.6
                                                                                 0.2                                                                                                                      #                   #                                                                                          0.3       0.6
                   < 0.1                     #                                                                                                                                     0.3                   0.3                                                                                                    #
                                                                                                                                                                                                                                                                                                                                #                3.4
                                                         #                                                                                             0.2                                                        #
                                                                                                                                                                                                                                               #                                                          0.3                                #        # 22.4
          #                                  0.7                                                                                  0.2                                                                                                                                                                                        #
                                                                                                                                                                                                                  0.2                                                                                                0.7 1.7 #
                                                                                                                                                        #
      < 0.1                                              0.1                                                                          #                                  #                                                                     0.4               #                                         #
                                                                                      0.1                                                                               0.2                               #                                                      0.3                         0.4        0.2            #
                                                                                                                                                                                                                                                                                                                         1.3 2.8
                                                                                         #
                                                                                         #
                                                                                                                                                                                                          0.3              0.6                                                               #          #
                                                                                                                                                                                                                                                                                                              # #
                                                                                                                                                                                                     #                                                                                               0.3
                                                                #                     0.2                                                                                                           0.4
                                                                                                                                                                                                                              #                                                                 # #       0.9
2.8                                                           1.0       #   0.1                                                                                                                                       0.4                                                                     0.5 0.4
#                                                                                                                                                                                                                          #      #       #                       0.6 0.4                          #
                                                                                                                                                                                                                                                                                                   #           # 1.6
      0.8              < 0.1                                                                                  0.1                         0.2                     0.4                 0.4                                     0.7 0.5                #
                                                                                                                                                                                                                                                                       #       #                 0.4 0.6
                                                                                                                                                                                                                                                                                                      # 0.7      #
      #                                                                                                 0.1       #                           #                    #
                           #
                                                                                                          #
                                                                                                                                                                                       #                  #
                                                                                                                                                                                                                                          #         0.6 0.5 #                   0.4                     #        12.6
                                                                                                                                                                                                          0.5                 0.5                                                  #                       # 1.5
                   #                                                    0.1              0.2              #                                                                                                                       #       0.5                          #                           0.5
                                                                                                             0.1                                                                                                                                             #
                  0.7                                                       #                  # 0.2
                                                                                               #                                                                                                                                                                 0.6 0.5                                #
                                                                                                #             #                                                                                                   0.7                                                                  0.5              #
      #                                                                     #
                                                                                               0.1        0.1                         0.5                          #
                                                                         0.1                                              0.1             #                                                     #
                                                                                                                                                                                                                      #               #                                                 #               0.8                                                        +
      1.5
                                                                                     #               #
                                                                                                         0.1               #
                                                                                                                                                                  0.6
                                                                                                                                                                         0.6
                                                                                                                                                                                                1.0                           1.2
                                                                                                                                                                                                                                          1.0
                                                                                                                                                                                                                                                             #        0.4    #
                                                                                                                                                                                                                                                                           0.3
                                                                                                                                                                                                                                                                                                                                                                 Na
                                                                                                                                                                                                                                                         0.7            #
                                                                                  0.2
                                                                                                                   #
                                                                                                                                                        #
                                                                                                                                                                              #
                                                                                                                                                                                                              1.2
                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                  #   1.3
                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                   0.8
                                                                                                                                                                                                                                                                    #        0.6     #
                                                                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                    1.3 1.8                                                                    (kg/ha)
                                                                                                                                                                                                                                                                   # 0.8 #
                                                                                                                                  #                                                                                                                                           #
                                                                                                                  0.1                               0.9                                                                                                                          1.4 #      #
                            #                                                                   #                                0.3                                                                                          1.4                                0.8 0.8 0.7
                                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                                                                                                  0.5
                                                                                                                                                                                                #                                                                                 #
                                                                                                                                                                                                                                                                                      2.0 10.3
                                                                                                                                                                                  #
                            1.2                                                                0.1                                                                                 1.1 0.9                                    #                                            #
                                                                                                                                                             #
                                                                                                                                                            1.5                         1.5                            1.8                               #
                                                                                                                                                                                                                                                                                                 1.9
                                                                                                                                                                                                                                                                                                   #                                                            0.5 - 1.0
                                                                   0.1                                                                                                                                                                               1.7
                                                 0.5
                                                                    #                           0.2
                                                                                                                           #
                                                                                                                           0.3
                                                                                                                                                                                            #                             #                                          1.1
                                                                                                                                                                                                                                                                       #                                                                                        1.0 - 1.5
                                                                0.5                                                                                                                                                                                                                    1.8
                                                                                                                                                                                                                                                                                                                                                                1.5 - 2.0
                                                     #                                               #                                                                                                                                        2.0                                       #
                                                                    #                                                                                                        2.1                                      2.7                       #                          1.7
                                                                                                                                                                              #                                       #
                                                                                                                                                                                                                                                                               #
                                                                                                                                                                                                                                                                                        2.3                                                                     2.0 - 2.5
                                                                                                                                                                                                                                                                       2.4               #

                                                                                                                                      1.0
                                                                                                                                                                                                                      2.9
                                                                                                                                                                                                                       #                                               #
                                                                                                                                                                                                                                                                                         #                                                                      2.5 - 3.0
                                                                                                                                                                                                                                                                                        2.7
              Sites not pictured:                                                                                 0.1
                                                                                                                                          #
                                                                                                                                                                   5.1
                                                                                                                                                                    #
                                                                                                                                                                                                      4.1
                                                                                                                                                                                                         #                                                                                              8.2                                                     3.0 - 3.5
                                                                                                                      #                                                                                                                                                                 #               #
              Alaska 01         < 0.1 kg/ha                                                                                                            3.3
                                                                                                                                                                                                                                                                                             4.9                                                                3.5 - 4.0
                                                                                                                                                                                                                                                                                                 3.1
              Alaska 03           0.1 kg/ha                                                                                                             #
                                                                                                                                                                                                                                                                                             #                                                                  4.0 - 4.5
              Virgin Islands 01 14.0 kg/ha                                                                                                                                                                                                                                                                                                                      > 4.5
                                                                                                                                                                                                                                                                                                         6.7
                                                                                                                                                                                                                                                                                                            #


              National Atmospheric Deposition Program/National Trends Network




                            Sodium ion concentration (top) and wet deposition (bottom), 2000.


                                                                                                                                                                        10
                                  #
                                0.22
                                                                 #                                                                                                                                                                                                                                                       #
                          #
                                                               0.04                        #                                                                                                                                                                                                                      0.15
                      0.29                    0.05                                        0.04                                                              #
                                                  #
                                                                                                                     #
                                                                                                                                                        0.04                                  0.04                                                                                                              0.13
                      #                                                                                          0.07                                                       0.05               #          #                                                                                                         #
                     0.47                                             0.04                                                                       0.06
              #                                                          #                                                                                                       #    # 0.06
                  0.66                  #                                                                                                         #                             0.06 0.05                                                                                                 0.07                 0.12
                  #
                                       0.04                                                                                                                            0.05        #                                                                                                                 0.06      # 0.16
              0.20                                                                               0.06                                                                                      0.05                                                               #
                                                                                                                                                                                                                                                                                           #         #          #
                                                                                                   #
                                                                                                                                                                            #    #         #                                             # 0.06 #        #
                                                                                  #                                                                                          0.06 #                                                            #         0.10 0.94
                        #                                                                                                                                                       # 0.06 # 0.07   #
                                                                                                                                                                                                                                       0.07
                                                                                                                                                                                                                                       0.11 0.06 0.10
                   0.03                                                          0.08                                                                                                                                                     #
                                              #
                                                           #                                                                                       0.07                       0.08     0.06 #                                                        #      # 0.58
          #                                   0.16                                                                               0.06                                                             #                                   0.11              #        # 2.76
      0.03                                                0.11                                                                       #
                                                                                                                                                    #           #                           0.06 0.10       #                           #    0.11 0.24 #
                                                                                      0.04                                                                    0.06              #                         0.10               0.12 0.08           #
                                                                                                                                                                                                                                                   0.23 0.43
                                                                                          #
                                                                                          #
                                                                                                                                                                               0.07 0.10                                      #      #
                                                                                                                                                                                                                                                # #
                                                                                                                                                                             #                                                        0.10
                                                                 #                    0.06                                                                                 0.08
                                                                                                                                                                                        #                                        # #        0.16
0.60                                                           0.42 # 0.09                                                                                                          0.09                                      0.13 0.13
 #                                                                                                                                                                                     # # #                0.12 0.11                #
                                                                                                                                                                                                                                     #           # 0.33
   0.29               0.06                                                                                0.08                        0.08               0.10       0.08                0.14 0.11 #             #     #           0.13 0.14
                                                                                                                                                                                                                                        # 0.19      #
      #                                                                                               0.06 #                                 #              #
                          #                                                                                                                                           #         #
                                                                                                                                                                                               #    0.11 0.13# 0.13                       #          1.75
                                                                                                           #
                                                                                                                                                                               0.10 0.10 0.11                           #                     # 0.29
                  #                                                      0.12             0.05             #                                                                              #
                                                                                                                                                                                                         #
                                                                                                                                                                                                                #                    0.10
                                                                                                # 0.05 0.05
              0.08                                                           #                  #                                                                                                         0.13 0.12                  #
                                                                                                 #      #                                                                         0.11                                   0.10        #
      #                                                                      #
                                                                                               0.05 0.07                             0.13                  #                         #        #                            #        0.16
    0.65                                                                 0.08                                         0.08               #
                                                                                                                                                          0.12             #
                                                                                                                                                                          0.13
                                                                                                                                                                                             0.13                                                                                                                                       -
                                                                                                                                                                                                                                                                                                                                  Cl
                                                                                                                         #                                                                                                    #
                                                                                                          0.12                                                 0.09                    0.16              #       0.09
                                                                                      #                #                                                          #                       #           0.12          #       0.10             #
                                                                                  0.08                                                                                          0.17        0.18             0.18                    0.23 0.31
                                                                                                                  #
                                                                                                                 0.07            #                  #
                                                                                                                                                                                  #         #                  #
                                                                                                                                                                                                              # 0.11 #
                                                                                                                                                                                                                             0.21
                                                                                                                                                                                                                               #
                                                                                                                                                                                                                                       #
                                                                                                                                                                                                                                  0.25 #        #
                                                                                                                                                                                                                                                                                                                                 (mg/L)
                            #                                                                     #                            0.10               0.16                                 0.21                       #      0.07
                                                                                                                                                                    #     #                                0.19 0.13                #
                                                                                                                                                                                                                                       0.34 1.13
                          0.33                                                                  0.05                                                                0.14 0.16           #                          #
                                                                                                                                                                                                                                                                                                                                       0.10
                                                                                                                                                       #                                                                        0.33
                                                                 0.10                                                     #
                                                                                                                                                     0.20             0.20
                                                                                                                                                                        #
                                                                                                                                                                                    0.25
                                                                                                                                                                                      #
                                                                                                                                                                                                       #
                                                                                                                                                                                                    0.28 0.21
                                                                                                                                                                                                                                  #                                                                                                  0.10 - 0.15
                                                  0.57
                                                      #          0.14
                                                                     #                           0.08
                                                                                                      #
                                                                                                                          0.14
                                                                                                                                                                                                                                  0.42
                                                                                                                                                                                                                                                    #
                                                                                                                                                                                                                                                               0.35                                                                  0.15 - 0.20
                                                                      #                                                                                                0.29
                                                                                                                                                                            #
                                                                                                                                                                                                              0.41
                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                   #                    0.26
                                                                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                                                                                                                     0.20 - 0.25
                                                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                0.40
                                                                                                                                                                                                              0.48                                  0.40         #                                                                   0.25 - 0.30
                                                                                                                                  0.26                                                                            #                                 #
                                                                                                                                                                                                                                                                 #                                                                   0.30 - 0.35
              Sites not pictured:                                                                              0.07
                                                                                                                                         #
                                                                                                                                                                0.77                               0.64
                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                0.54
                                                                                                                                                                                                                                                                              1.63                                                   0.35 - 0.40
                                                                                                                                                                  #
              Alaska 01           0.03 mg/L                                                                          #                                                                                                                                           #
                                                                                                                                                                                                                                                                     0.85
                                                                                                                                                                                                                                                                              #


              Alaska 03           0.04 mg/L
                                                                                                                                                      0.72
                                                                                                                                                        #                                                                                                              0.55
                                                                                                                                                                                                                                                                                                                                     0.40 - 0.45
              Virgin Islands 01 3.51 mg/L
                                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                                                                     0.45 - 0.50
                                                                                                                                                                                                                                                                              0.80
                                                                                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                                                                                                                     > 0.50




                                  #
                                3.5
                                                                 #                                                                                                                                                                                                                                                       #
                          #
                                                               0.2                         #                                                                                                                                                                                                                            1.4
                      2.4                     0.2                                         0.1                                                               #
                                                  #
                                                                                                                     #
                                                                                                                                                        0.3                                   0.3                                                                                                                1.5
                      #                                                                                           0.2                                                        0.3               #          #                                                                                                         #
                          7.2                                         0.1                                                                        0.4                             #                        0.4
              #                                                          #                                                                                                                      #
                  4.9                   #                                                                                                         #                                  0.4          0.3                                                                                     0.8                  1.4
                  #                    0.2                                                                                                                             0.3                #                                                                                                          0.8       # 1.7
                  3.7                                                                            0.2                                                                                                          0.4                                                                          #         #          # #
                                                                                                   #
                                                                                                                                                                            #         #                       #                          #                                                0.7    #         #
                                                                                  #                                                                                             0.4           #                                                                                                 #              1.2 11.4
                        #                                                                                                                                                         #           0.6             0.5                      0.4                                        1.4
                                                                                 0.3                                                                                                                  #               #                                                                        0.8       1.3
                      0.1                     #                                                                                                                                  0.5                0.6                                                                               #                #             6.3
                                                           #                                                                                          0.3                                                     #
                                                                                                                                                                                                                                   #                                            0.9                              #       #
          #                                   0.4                                                                                0.2                                                                                                                                                                #                         37.2
       0.1                                                0.2                                                                        #
                                                                                                                                                        #              #                                      0.5                  0.8        #                                  #          1.7 3.2 #
                                                                                      0.2                                                                             0.4                               #                                     0.7                    1.3      0.7             #
                                                                                                                                                                                                                                                                                                2.9 5.1
                                                                                          #
                                                                                          #
                                                                                                                                                                                                        0.6           1.1                                             #       #
                                                                                                                                                                                                                                                                                                 # #
                                                                                                                                                                                                  #                                                                          0.8
                                                                 #                    0.3                                                                                                      0.7
                                                                                                                                                                                                                      #                                                 # #      1.9
4.7                                                            1.6       #   0.2                                                                                                                                  0.7                                                 1.4 1.2
#                                                                                                                                                                                                                     #   #   #                1.1 1.0                     #
                                                                                                                                                                                                                                                                           #                     #   3.3
      1.4             < 0.1                                                                                    0.2                       0.3                    0.6              0.6                                   1.4 1.1         #
                                                                                                                                                                                                                                                    #    #               1.1 1.5
                                                                                                                                                                                                                                                                              # 1.7                  #
      #                                                                                                0.2       #                           #                   #
                          #
                                                                                                           #
                                                                                                                                                                                  #
                                                                                                                                                                                        0.9         1.0 1.2 # 1.4
                                                                                                                                                                                                        #
                                                                                                                                                                                                                     #        #         #       22.1
                                                                                                                                                                              0.8              1.0                                         # 3.1
                  #                                                      0.1               0.3             #                                                                              #
                                                                                                                                                                                                        #
                                                                                                                                                                                                             #                      1.1
                                                                             #                  # 0.3
                                                                                                #           0.2                                                                                           1.4 1.2                  #
                  1.1                                                                            #           #                                                                   1.2
      #                                                                      #
                                                                                                0.3        0.2                       0.6                  #                         #        #                         1.2         #
                                                                                                                                                                                                                                  1.7
      2.4                                                                  0.1                                           0.2             #
                                                                                                                                                          0.8              #
                                                                                                                                                                                              1.7
                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                                                                        -
                                                                                      #                #
                                                                                                           0.2           #
                                                                                                                                                              0.9
                                                                                                                                                                #
                                                                                                                                                                          1.4          1.9
                                                                                                                                                                                         # 2.1
                                                                                                                                                                                                        #
                                                                                                                                                                                                      1.2
                                                                                                                                                                                                               0.8
                                                                                                                                                                                                                 #
                                                                                                                                                                                                                            #
                                                                                                                                                                                                                          0.8                                                                                                     Cl
                                                                                                                                                                               1.8                                                        #
                                                                                  0.2
                                                                                                                  #
                                                                                                                                                    #
                                                                                                                                                                                 #          #
                                                                                                                                                                                                            1.6
                                                                                                                                                                                                             #              1.6
                                                                                                                                                                                                                                    2.5 3.1
                                                                                                                                                                                                                                     #                                                                                           (kg/ha)
                                                                                                                                                                                                            # 1.6 #
                                                                                                                                 #                                                                                           #
                                                                                                                 0.2                               1.3                                                                          2.7 #        #
                            #                                                                     #                             0.5                                      #             2.2                     #
                                                                                                                                                                                                          2.4 1.6      1.2
                                                                                                                                                                                                                                      3.5 17.6
                                                                                                                                                                   #                                                              #
                            1.9                                                                  0.2                                                                1.7 1.4             #                       #                                                                                                                      0.5
                                                                                                                                                                                                                              3.4
                                                                     0.2
                                                                                                                                                       #
                                                                                                                                                      2.2             2.4           3.0               #
                                                                                                                                                                                                    2.9
                                                                                                                                                                                                                               #                                                                                                     0.5 - 1.0
                                                                                                                          #                                            #             #                      2.1
                                                  0.8
                                                                     #                           0.3                      0.4                                                                                #
                                                                                                                                                                                                                       3.3
                                                                                                                                                                                                                                                                                                                                     1.0 - 1.5
                                                      #          0.7                                  #                                                                                         3.2
                                                                      #                                                                                         3.6
                                                                                                                                                                 #
                                                                                                                                                                                   4.5
                                                                                                                                                                                   #
                                                                                                                                                                                                  #             2.9
                                                                                                                                                                                                                         #
                                                                                                                                                                                                                                                                                                                                     1.5 - 2.0
                                                                                                                                                                                                                   #
                                                                                                                                                                                                              4.1
                                                                                                                                                                                                                        3.9
                                                                                                                                                                                                                          #                                                                                                          2.0 - 2.5
                                                                                                                                                                                  5.0
                                                                                                                                     1.5
                                                                                                                                                                                                              #   #                                              #                                                                   2.5 - 3.0
                                                                                                                                                                                                    7.5                                                          5.2
              Sites not pictured:                                                                                0.2
                                                                                                                                         #
                                                                                                                                                                 8.5
                                                                                                                                                                  #
                                                                                                                                                                                                      #                                                                       13.6
                                                                                                                                                                                                                                                                              #
                                                                                                                                                                                                                                                                                                                                     3.0 - 3.5
                                                                                                                     #                                                                                                                                           #
              Alaska 01           0.1 kg/ha                                                                                                           5.4
                                                                                                                                                                                                                                                                      8.5
                                                                                                                                                                                                                                                                                                                                     3.5 - 4.0
              Alaska 03           0.2 kg/ha                                                                                                             #
                                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                        5.4
                                                                                                                                                                                                                                                                                                                                     4.0 - 4.5
              Virgin Islands 01 24.8 kg/ha
                                                                                                                                                                                                                                                                              11.7                                                   > 4.5
                                                                                                                                                                                                                                                                                  #


              National Atmospheric Deposition Program/National Trends Network




                            Chloride ion concentration (top) and wet deposition (bottom), 2000.


                                                                                                                                                                      11
                                     #
                                    160
                                                                #                                                                                                                                                                                                                                                                   #
                                #
                                                                60                        #                                                                                                                                                                                                                                        95
                            83                 47                                         26                                                                 #
                                                   #
                                                                                                                     #
                                                                                                                                                            69                                  64                                                                                                                            109
                            #                                                                                        32                                                        73               #        #                                                                                                                     #
                             154                                         28                                                                        61                           #                        61
                   #                                                     #                                                                                                                       #
                       74                 #                                                                                                        #                                74          69                                                                                                            107         115
                       #                  55                                                                                                                            72              #                                                                                                                             124 # 109
                       186                                                                      28                                                                                                           79                                                                                                #      #       # #
                                                                                                    #
                                                                                                                                                                           #        #                        #                                #                                                               122 #       #
                                                                                  #                                                                                            68           #                                                                                                                   #       123 121
                            #                                                                                                                                                       #       86                   84                           57                                                      124
                                                                                  34                                                                                                                 #                   #                                                                                      122 124
                            26                 #                                                                                                                                62               105                                                                                                      #         #      # 109
                                                           #                                                                                            42                                                   #
                                                                                                                                                                                                                                         #                                                          83                         # 135
               #                               23                                                                                   43                                                                                                                                                                                 #
           27                                              22                                                                          #
                                                                                                                                                        #              #                                      79                         85               #                                          #         150 132 #
                                                                                       40                                                                             62                             #                                                    73                           109        82             #
                                                                                                                                                                                                                                                                                                                   130 118
                                                                                          #                                                                                                              80          110                                                                #         #
                                                                                          #                                                                                                      #                                                                                            83       # #
                                                                 #                     45                                                                                                       84
                                                                                                                                                                                                                         #                                                                # #      124
      79                                                        38       #    19                                                                                                                                  76                                                                        96
                                                                                                                                                                                                                                                                                        110 #
      #                                                                                                                                                                                                               #      #       #                     92             89                #           # 101
           47                   6                                                                             22                           43                    57                71                                    103 97               #
                                                                                                                                                                                                                                                                  #       #                86 109
                                                                                                                                                                                                                                                                                               # 94       #
           #                                                                                            35       #                             #                  #
                                #                                                                                                                                                   #                #
                                                                                                                                                                                                                                     #        98                  #        110                   #        126
                                                                                                         #
                                                                                                                                                                                                     78                   87                              93                  #                     # 108
                        #                                                12               69             #                                                                                                                   #       87                           #                         111
                                                                                                             41                                                                                                                                       #
                       135                                                   #                 # 49
                                                                                               #                                                                                                                                                          113 102                                 #
                                                                                                                                                                                                             108
           #
           37
                                                                             #
                                                                             19
                                                                                                #
                                                                                               54        34
                                                                                                             #
                                                                                                                         24
                                                                                                                                        44
                                                                                                                                           #
                                                                                                                                                                 #
                                                                                                                                                                 64                         #
                                                                                                                                                                                                                 #               #
                                                                                                                                                                                                                                 131
                                                                                                                                                                                                                                                                                  124
                                                                                                                                                                                                                                                                                   #
                                                                                                                                                                                                                                                                                                  #
                                                                                                                                                                                                                                                                                                 108                                    Precipitation
                                                                                      #              #
                                                                                                         14               #
                                                                                                                                                                       100
                                                                                                                                                                           #
                                                                                                                                                                                            108                       121
                                                                                                                                                                                                                             #                    104
                                                                                                                                                                                                                                                      #               90
                                                                                                                                                                                                                                                                      #         #
                                                                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                       85                                                   (cm)
                                                                                   31                                                                                                                    111                     114                        90             109 101
                                                                                                                  #                                                                                          #                   #                           #        79    #
                                                                                                                 38                #                    #
                                                                                                                                                       80
                                                                                                                                                                                                                                                             144 #
                                                                                                                                                                                                                                                              #       #
                                                                                                                                                                                                                                                                         107 #     #                                                          20
                                                                                                                                   46                                                                                                                     130 118 171
                                #                                                               #                                                                                                                                                              #
                                                                                                                                                                               #            #                         103                                                 #
                                                                                                                                                                                                                                                                             105 155
                                58                                                              35                                                                             119 88                                    #                                            #                                                                     20 - 40
                                                                                                                                                                                                                                                                                            102
                                                                    19                                                                                  106
                                                                                                                                                            #
                                                                                                                                                                                    121                          122
                                                                                                                                                                                                                                              105
                                                                                                                                                                                                                                                  #                                          #                                              40 - 60
                                                                                                                          #                                                             #                            #                                     100
                                                    15
                                                                     #
                                                                    54
                                                                                                45
                                                                                                    #
                                                                                                                              31                                                                                                                               #
                                                                                                                                                                                                                                                                                  95                                                        60 - 80
                                                       #                                                                                                                                                                                 77
                                                                     #                                                                                                  125
                                                                                                                                                                           #
                                                                                                                                                                                                                 109
                                                                                                                                                                                                                 #
                                                                                                                                                                                                                                         #                            111
                                                                                                                                                                                                                                                                                   #
                                                                                                                                                                                                                                                                                                                                            80 - 100
                                                                                                                                                                                                                                                                          #
                                                                                                                                                                                                                                                                  102
                                                                                                                                                                                                                                                                                   96
                                                                                                                                                                                                                                                                                    #                                                       100 - 120
                                                                                                                                                                                                              103
                                                                                                                                        57
                                                                                                                                                                                                 118
                                                                                                                                                                                                                  #                                               #
                                                                                                                                                                                                                                                                                    #
                                                                                                                                                                                                                                                                                   95
                                                                                                                                                                                                                                                                                                                                            120 - 140
                Sites not pictured:                                                                              32
                                                                                                                                           #
                                                                                                                                                                 110
                                                                                                                                                                  #
                                                                                                                                                                                                     #                                                                                            83                                        140 - 160
                                                                                                                                                                                                                                                                                   #              #
                Alaska 01          40 cm                                                                             #
                                                                                                                                                        75
                                                                                                                                                                                                                                                                                        101
                                                                                                                                                                                                                                                                                                                                            160 - 180
                Alaska 03          36 cm                                                                                                                #                                                                                                                                   97

                Virgin Islands 01 71 cm
                                                                                                                                                                                                                                                                                        #
                                                                                                                                                                                                                                                                                                                                            180 - 200
                                                                                                                                                                                                                                                                                                  147
                                                                                                                                                                                                                                                                                                      #
                                                                                                                                                                                                                                                                                                                                            > 200
                National Atmospheric Deposition Program/National Trends Network



                                                                                                                     Total precipitation, 2000.




MDN Data                                                                                                                                                                   Mercury concentrations and wet depositions are
The MDN maps on the next page show the                                                                                                                                     plotted on maps of southern Canada and the
average precipitation-weighted concentrations and                                                                                                                          contiguous United States showing areas with
annual wet depositions of total mercury in                                                                                                                                 current fish or wildlife consumption advisories.
precipitation. Colored dots mark MDN sites                                                                                                                                 These advisories warn that high concentrations of
meeting prescribed data completeness criteria. In                                                                                                                          mercury have been found or are suspected in fish or
2000, 39 sites met these criteria. The colors                                                                                                                              wildlife from certain water bodies in these areas,
represent the concentration or deposition classes                                                                                                                          and that consumption of these fish or wildlife may
indicated in the legend. Concentration and                                                                                                                                 pose health risks. Mercury in fish and wildlife can
deposition values are printed next to the colored                                                                                                                          come from many natural processes, including
dots. Black dots mark MDN sites that were active                                                                                                                           precipitation. The connection between the wet
in 2000 but did not meet all completeness criteria.                                                                                                                        deposition of mercury and mercury in fish or
(For an explanation of the data completeness                                                                                                                               wildlife is under study. For more information about
criteria and how precipitation-weighted averages                                                                                                                           mercury advisories, see the U.S. Environmental
or depositions were calculated, see the NADP                                                                                                                               Protection Agency Internet site at
Internet site.)                                                                                                                                                            www.epa.gov/ost/fish.




                                                                                                                                                                     12
                                                                                                                                           4.7              #
                                                                                                                                               #
                                                                                                                                               #

                               #
                 #


                 #
                 #
                 9.8
                                                                  14.5                                                               5.1 6.7
                                                      12.5        #
                                                                  #
                                                                                                                            8.7      # 7.0 # #
                                                                                                                                      #    #  #
                                                             #
                                                             #
                                                                                                                                    6.4 #    5.4
                                                    11.8           # 11.7
                                                                   #                                                        #
                                                                                                                            #
                                                         #                                                                          ##
                                                         #
                                                                  14.4 # #
                                                                       # #
                                                                                                                            #
                                                                                                                            #       #    6.6
                                                                       10.6                           #
                                                                                                                            6.9
                                                    15.2
                                                     #
                                                     #
                                                                                                                    9.0
      3.6                                                                 13.4                         #            #
                                                                                                                    #           #
       #
       #                                                                    #
                                                                            #
                                                                                                              9.7 10.5
                                                                                     #
                                                                                             #
                                                                                                                #
                                                                                                                #
                                                                                                                     #
                                                                                                                            #
                                                                                                                            #
                                    #
                                    #                                      11.6                        #
                                                                                                       #
       #
       #                            7.9                                      #
                                                                             #
                                                                                                      11.2
        10.3                                                                             #


                                                                                                                                                     Hg
                                                                                                                        8.2 #
                                                                                                                            #
                                                                                                                                                   (ng/L)
                                                                                                                     9.6
                                                                                                       10.4           #
                                                                                                                      #
                                                                                                                                                       4
                                                                                                 #         #
                                                                                                           #
 Mercury                     19.4                                                                                                                    4-6
                              #
                              #
                                                                                         #                                                           6-8
Advisories                                          12.2         12.3
                                                      #
                                                      #
                                                                    #                                11.1                                            8 - 10
   None                                                                                                #
                                                                                                       #
                                                                 9.9
                                                                                 #
                                                                                                                                                     10 - 12
                                                                       ##
   At least 1 in                                                 # 11.6                               13.1                                           12 - 14
   State/Province                                                                                      #
                                                                                                       #
                                                                                                                                                     14 - 16
   Statewide                                                                                                  13.7
                                                                                                                  ##                                 16 - 18
   Coastal                                                                                                    15.8 #
                                                                                                                   #
                                                                                                                     #
                                                                                                                     #                               > 18
                                                                                                                 13.6




                                                                                                                                           4.4              #
                                                                                                                                               #
                               #
                 #


                 #
                     6.2
                                                                  9.5                                                                5.2 6.3
                                                      8.6          #                                                        6.9      # 8.7 # #
                                                             #                                                                      6.9 #    6.8
                                                     7.6           # 9.2                                                    #
                                                         #        9.2 # #
                                                                                                                                    ##
                                                                                                                             #      #    7.9
                                                                       7.5                                                  7.6
                                                    9.5                                               #

                                                     #
                                                                                                                    7.0
      2.4                                                                 14.5                                      #           #
       #                                                                    #                          #
                                                                                                              8.6 12.5
                                                                                     #
                                                                                             #
                                                                                                                #     #
                                                                                                                            #
                                    #                                       9.6                           #
       #                            9.0                                      #                         9.7
           3.8                                                                           #


                                                                                                                                                     Hg
                                                                                                                     10.8 #
                                                                                                                                                   (µg/m2)
                                                                                                                    12.1
                                                                                                          10.7          #                               4
                                                                                                 #          #
 Mercury                      5.6                                                                                                                     4-6
                               #
Advisories                                          14.5          13.3
                                                                                         #
                                                                                                                                                      6-8
                                                         #            #                              10.0
  None                                                                                                 #                                              8 - 10
  At least 1 in
                                                                 11.1  #
                                                                                 #
                                                                                                                                                      10 - 12
                                                                 # 11.9                               13.1
  State/Province                                                                                       #                                              12 - 14
  Statewide                                                                                                   14.3                                    14 - 16
                                                                                                                     #                                16 - 18
  Coastal                                                                                                     18.1 #
                                                                                                                     #                                > 18
                                                                                                                 20.0
     National Atmospheric Deposition Program/Mercury Deposition Network


           Mercury concentration (top) and wet deposition (bottom), 2000.
        Mercury advisories are for fish and wildlife consumption, not deposition.

                                                             13
                  PA15                                   MD15                             DE02
                6.2 kg/ha                              4.6 kg/ha                        5.5 kg/ha
                  95 cm                                 120 cm                           130 cm




                  VT99                                   NY67                             TN00
                6.4 kg/ha                              6.1 kg/ha                        6.4 kg/ha
                 134 cm                                 105 cm                           140 cm




                                  Nitrogen deposition          Nitrogen deposition
                                  in warm season sample        in cold season sample




                   IL11                                    Site                           FL18
                                                        x.x kg/ha
                5.7 kg/ha                                                               3.8 kg/ha
                                                          xx cm
                  90 cm              2000                                                 88 cm
                                                                      2000
                                     precipitation
                                                                      inorganic
                                                                      nitrogen
                                                                      deposition
                                                     Grouped minor
                                                        samples


 Contributions of individual samples to inorganic nitrogen wet deposition at AIRMoN
     sites, 2000. Minor samples contributing less than 0.5 percent are grouped.

AIRMoN Data                                                   NO3– -N and NH4+ -N concentrations. (See the
The donut graphs, above, show the inorganic                   NADP Internet site for an explanation of
nitrogen deposition from nitrate (NO3– -N) and                precipitation-weighted averages.) Not shown are
ammonium (NH4+ -N) in warm and cold season                    graphs from the Ohio (OH09) site, which ended
samples at AIRMoN sites active through 2000.                  operations in October, and the West Virginia
Warm season samples (green) occur in May-                     (WV99) site, which began in June 2000.
October, approximating the northern U.S. growing
season. Cold season samples (blue) occur in                   The green and blue portions of the donut indicate
January-April and November-December, approxi-                 the relative amounts of nitrogen deposited by
mating the northern U.S. dormant season. White                precipitation in the warm and cold seasons,
lines demarcate nitrogen deposition in individual             respectively. For the Tampa Bay (FL18) site, warm
samples, arranged in descending amounts by                    season deposition was about 86 percent of the total,
seasons. Annual nitrogen deposition from NO3– -N              and just nine warm season samples (i.e., nine
and NH4+ -N was calculated from the total annual              slices) accounted for about half of the annual
precipitation and precipitation-weighted average              nitrogen deposition.

                                                           14
NTN Operations                                         of precipitation. To retard chemical changes,
                                                       samples are refrigerated after collection and until
NTN is the only network providing a long-term          analysis at the CAL. AIRMoN sites also are
record of precipitation chemistry across the           equipped with a National Weather Service standard
United States. NTN sites are predominantly             precipitation gage. The CAL performs the same
located away from urban areas and point sources        analyses and similar data validation procedures as
of pollution. Each site has a precipitation            for NTN. The NADP Program Office makes the
chemistry collector and gage. The collector is         data available on the NADP Internet site.
automated to ensure that the sample is exposed
only during precipitation, i.e., wet-only sampling.    MDN Operations
Rigorous siting criteria and standard operational
procedures ensure the comparability and                MDN sites collect samples weekly using a
representativeness of NTN data.                        precipitation chemistry collector especially
                                                       modified to preserve mercury and equipped with
Samples are collected weekly on Tuesday                ultraclean glassware. Rigorous sample handling
morning. The site operator transfers the sample        procedures are followed. All samples are analyzed
from the collection bucket to a shipping bottle        for total mercury (Hg) at the Hg Analytical
and, volume permitting, removes a portion for pH       Laboratory (HAL) at Frontier Geosciences, Inc., in
and conductivity measurements. The sample is           Seattle, Washington. Data are reviewed and
then shipped to the Central Analytical Laboratory      validated by the NADP Program Office before
(CAL) at the Illinois State Water Survey for           being made available on the NADP Internet site.
analysis, data entry, and data validation. In
addition, all collection buckets and sample bottles    Recent NADP Accomplishments
are cleaned at the CAL, which has served as the
sole analytical laboratory since the program           In a recent report using NADP data (Deposition of
began. The CAL measures sample volume, Ca2+,           Air Pollutants to the Great Waters - Third Report
Mg 2+, K+, Na+, NH4+, NO3-, Cl-, SO42-, H+ (pH),       to Congress. EPA-453/R-00-005, U.S. Environ-
conductivity, and orthophosphate (PO43-).              mental Protection Agency, June 2000) :
                                                       • Scientists report that “the rates of inorganic
Field and laboratory data are reviewed at the CAL          nitrogen wet deposition to many of the Great
for completeness and accuracy. Data are also               Waters watersheds [Great Lakes, Lake
screened to identify or flag samples for which the         Champlain, Chesapeake Bay] have been
quality is compromised: samples that are not wet-          relatively constant for the past two decades.”
only deposition or samples that are mishandled or      • “Atmospheric nitrogen deposition, including
grossly contaminated. The CAL then delivers all            wet deposition, contributes roughly 10 to 40
data and information to the NADP Program                   percent of total nitrogen loads reaching bays
Office. One final set of checks is applied, and any        and estuaries in east and Gulf coastal areas.”
discrepancies are resolved on a case-by-case basis.    • “The MDN site in the Lake Champlain basin at
At that point the data are made available on the           Underhill, VT, is now the longest continuous
NADP Internet site.                                        monitoring program in the world for total
                                                           mercury wet deposition.”
AIRMoN Operations                                      • AIRMoN data support the observation that
                                                           “about a third of the new nitrogen delivered to
AIRMoN sites generally follow the same                     Tampa Bay comes from atmospheric deposition
procedures as NTN sites, except that operators             direct to the bay surface.”
collect samples daily within 24 hours of the start


                                                      15
                                                                                           NTN                                                                                 MDN
               #       #
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               #                                        #   #                                                             # #       # # #         #                            #               ##
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       #                                                #    # #                              #               #    #                     #                                                                              #
                   #                        #                           #                               #                     #     #
                       #                                   #        #                                                     #          #    #                                    #
                               #                          # ##                                   #               #              #             #                                                                         #           #   #
                                            #                     #                                          #     #          #           #                   #                                    #
                                                            ##        #                    #                                 ## # #                                                                     #
                   #                                                                             ## #                                   # # #                                                                   #               # # #
                                                                                                                #               #                                         #                                             #
                           #                                                                #                                                                 #                                    #
                                                                                                                         #             # #                                                                  #
                                                #        #                 #                          #        #
                                                                                                         #                    #
                                       #                         #                          #
                                                                                                                                    #
                                                    #
                                                                  #                               #           # # #              #
                                                                                                                                                                                                                                        #
                                                                                                 #                                  #
                                                                                                              #               #     #                                                                                               #
                                                                                   #                                         #                                                                                              #
                       Alaska                                          #                      #           #
                                                                                                                                    #   #                             #
                                                                                                                                                                                                                    #
                                                                                                                                                                                                            #
                                                                                               #                                    #                                          #           #
                                                                                                                                                                                                    #                   #
                                                                                                                                                                                               #
                                        #                            Hawaii                                                              #                                             #
                                                                                                                                                                                                                        #
                                       #
                                                                                                   Puerto Rico Virgin Islands                                                                                                       #
                                                                                                                                                                                                                                    #
                                                                                                         #                #                                                                                                         #
                                                                                       #




                                                                                                                                                                              AIRMoN

                                                                                                                                                                                                                                                                #

 Note:
                                                                                                                                                                                                                                                    #

 When referencing maps or information in this report,                                                                                                                                                                                           #


 please use the citation: National Atmospheric Deposi-                                                                                                                                                              #                                       #
                                                                                                                                                                                                                            #               #
                                                                                                                                                                                                                                                        #


 tion Program. 2001. National Atmospheric Deposition                                                                                                                                                                            #

 Program 2000 Annual Summary. NADP Data Report
 2001-01. Illinois State Water Survey, Champaign, IL.
                                                                                                                                                                                                                                        #




The NADP is National Research Support Project - 3: A Long-Term Monitoring Program in Support of
Research on the Effects of Atmospheric Chemical Deposition. More than 220 sponsors support the NADP,
including private companies and other nongovernmental organizations, universities, local and state
government agencies, State Agricultural Experiment Stations, national laboratories, Native American
organizations, Canadian government agencies, the National Oceanic and Atmospheric Administration, the
Environmental Protection Agency, the Tennessee Valley Authority, the U.S. Geological Survey, the National
Park Service, the U.S. Fish & Wildlife Service, the Bureau of Land Management, the U.S. Department of
Agriculture - Forest Service, and the U.S. Department of Agriculture - Cooperative State Research, Education,
and Extension Service (under agreement no. 98-COOP-1-5925). Any findings or conclusions in this
publication do not necessarily reflect the view of the U.S. Department of Agriculture or other sponsors.

 The NADP Program Office is located at the Illinois State Water Survey, an Affiliated Agency of the
 University of Illinois and a Division of the Illinois Department of Natural Resources.
 NADP data and information, including color contour maps in this publication, are available from
 the NADP Internet site:
                                          http://nadp.sws.uiuc.edu
 For further information, special data requests, or to obtain copies of this publication, contact the
 NADP Program Office, Illinois State Water Survey, 2204 Griffith Drive, Champaign, IL 61820.
                                        e-mail: nadp@sws.uiuc.edu

  NADP Data Report 2001-01