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					Validation activities at the Zugspitze, 47.4 N, 2964 m asl.
Validation of SCIAMACHY Products with Ground-
based FTIR Observations from the NDSC1 Network
DLR Contract: 50 EE 0007
Principle Investigator:
Ralf Sussmann, IMK-IFU, Garmisch
Staff:
Alexander Rockmann, IMK-IFU (engineer)
Wolfgang Stremme, IMK-IFU (PhD Student)

linked to
ENVISAT-Validation AO-Project ID126
“VALIDATION OF ENVISAT-1 LEVEL-2 PRODUCTS RELATED TO LOWER ATMOSPHERE O3 AND
NOY CHEMISTRY BY AN FTIR QUASI-GLOBAL NETWORK”

Martine De Maziere, Thierry Coosemans, BIRA

1
    NDSC: Network for the Detection of Stratospheric Change

            Karlsruhe Research Center

            IMK-IFU Garmisch, Ralf Sussmann
Karlsruhe Research Center

IMK-IFU Garmisch, Ralf Sussmann
                                 Permanent Ground Truthing Facility Zugspitze/Garmisch
                                 according to the WMO requirements.
                                 Validation of and Synergistic use with
                                 Satellite Measurements


MAPS,
MOPITT,
SAGE,
ENVISAT
Selected by EUMETSAT                          FTIR
                                                     GPS
                                    In situ                UV
as European Site for                          IFU

operational                                   2964 m            LIDAR

AIRS/IASI Validation                          Zugspitze         IFU

                                                                                                  Radio sondes


                                                                           IFU




                                                                        LIDAR   FTIR
                                                                                       GPS   UV   In situ
Example:                                                                         IFU
2002 AIRSVAL Campaign                                       Garmisch
                                                                                 734 m
3-months-7-days-a-week operation
data delivery twice a day within 12 h

               Karlsruhe Research Center

               IMK-IFU Garmisch, Ralf Sussmann
Zugspitze Solar FTIR: NDSC Primary-Status Instrument

                                          0.00186 cm-1 resolution
                                          (OPD = 486 cm) Bruker
                                          IFS120HR FT-spectrometer




 • SFIT1.09e/2.38
 • FASCATM 2.03 raytracing


        Karlsruhe Research Center

        IMK-IFU Garmisch, Ralf Sussmann
Zugspitze FTIR: Quality control/intercomparison

 (taken from “Zugspitze FTIR NDSC Report Form 2003”):
 Name, date, and location of last intercomparison and/or validation:
 •1996 intercomparison with Jungfraujoch: coincident measurements and
 independent analyses of HF, HCl. Agreement within 2 per cent
 •In 2001 evaluation of the Zugspitze time series since 1995 of HCl and
 ClONO2, and comparison to the Jungfraujoch series; showed very good
 overall agreement!
 •In spring 2003 comparison of the Zugspitze time series (1996-2002) of CO
 to the Jungfraujoch series; showed very good overall agreement!
 •Intense 3 months water vapor validation campaign at Zugspitze (mid Aug –
 mid Nov 2002) with permanent FTIR water vapor measurements compared
 to 4 radio sondes launched on site daily and permanent GPS water column
 measurements on site. Very good agreement of FTIR to sonde columns
 within a few per cent! Detailed FTIR validation study also relative to GPS
 measurements under way.
         Karlsruhe Research Center

         IMK-IFU Garmisch, Ralf Sussmann
Zugspitze FTIR: Quality control/intercomparison


Example 1




Yurganov et al., to be
published
            Karlsruhe Research Center

            IMK-IFU Garmisch, Ralf Sussmann
Zugspitze FTIR: Quality control/intercomparison
                                                                            Zugspitze (2964 m) Total Column
Example N2O                 4,7E+18
                                                                            Jungfraujoch (3580 m) Total Column
                            4,6E+18                                         Zugspitze Partial Column above 3580 m
+                           4,5E+18
also done for
                            4,4E+18
all other        Column (cm-2)

species!                    4,3E+18


                            4,2E+18


                            4,1E+18


                            4,0E+18


                            3,9E+18


                            3,8E+18
                                 939,000   939,200   939,400   939,600   939,800   940,000   940,200   940,400   940,600   940,800
                                                                           MJD2000

        Karlsruhe Research Center

         IMK-IFU Garmisch, Ralf Sussmann
SCIAMACHY Validation by FTIR at Zugspitze: Schedule, Activity

Species: CO, CH4, N2O, O3, NO2
Contract-Committment:
Commissioning Phase: Intense measurement phase between L+3 and L+6;
measurement intensity: two weeks per month; columns be made available
within 45 days
Main validation phase: Intense measurement phase between L + 6 and L + 18
months; measurement intensity: one week per month; columns will be made
available within 90 days.
We did much more: permanent 4 weeks per month operation
„5.5 months Commissioning Phase“: including weekends
15 July - 31 Dec 2002: 60 Measurement days at Zugspitze within first 5.5
months!
Main validation phase:
15 July 2002 – 1 July 2003: 127 measurement days within first 11.5 months!

All retrievals have been submitted to Cal/Val database
         Karlsruhe Research Center

         IMK-IFU Garmisch, Ralf Sussmann
Zugspitze FTIR: Measurement days per month (15 July 2002 – 1 July 2003)

                          18
                                               First 11.5 Months Total = 127 Days
                          16
    Measurement days per month



                          14

                          12

                          10

                                 8

                                 6

                                 4

                                 2

                                 0
                                     07/02 08/02 09/02 10/02 11/02 12/02 01/03 02/03 03/03 04/03 05/03 06/03
                                                                  Month/Year
                                     Karlsruhe Research Center

                                     IMK-IFU Garmisch, Ralf Sussmann
   Zugspitze FTIR: Relative Activity during Commissioning (15 Jul – 1 Dec 2002)




De Maziere et al.,
Proc. ESA-ACVT
Meeting, 2003




                     Karlsruhe Research Center

                     IMK-IFU Garmisch, Ralf Sussmann
Zugspitze FTIR: Ozone Columns Series (15 July 2002 – 1 July 2003)

                          1,4E+19

                          1,2E+19
    Total Column (cm-2)



                          1,0E+19

                          8,0E+18

                          6,0E+18
                                           Zugspitze Solar FTIR
                          4,0E+18          Total Ozone
                                           for Sciamachy Validation
                          2,0E+18

                          0,0E+00
                                1. Jul   20. Aug 9. Okt 28. Nov 17. Jan 8. Mrz 27. Apr 16. Jun
                                                      Time of year 2002/03
                             Karlsruhe Research Center

                             IMK-IFU Garmisch, Ralf Sussmann
Zugspitze FTIR: NO2 Columns Series (15 July 2002 – 1 July 2003)

                        1,0E+16
                                                   Zugspitze Solar FTIR
                        8,0E+15                    Total NO2
  Total Column (cm-2)




                                                   for Sciamachy Validation
                        6,0E+15


                        4,0E+15


                        2,0E+15


                        0,0E+00
                              1. Jul   20. Aug 9. Okt 28. Nov 17. Jan 8. Mrz 27. Apr 16. Jun
                                                    Time of year 2002/03
                            Karlsruhe Research Center

                            IMK-IFU Garmisch, Ralf Sussmann
Zugspitze FTIR: CO Columns Series (15 July 2002 – 1 July 2003)

                     2,0E+18
   Vertical Column (cm-2)



                     1,6E+18


                     1,2E+18


                     8,0E+17          Zugspitze Solar FTIR
                                      CO Columns
                                      for Sciamachy Validation
                     4,0E+17


                     0,0E+00
                           1. Jul   20. Aug 9. Okt 28. Nov 17. Jan 8. Mrz 27. Apr 16. Jun
                                                  Time of year 2002/03
                            Karlsruhe Research Center

                            IMK-IFU Garmisch, Ralf Sussmann
Zugspitze FTIR: CH4 Columns Series (15 July 2002 – 1 July 2003)


                       3,0E+19

                       2,5E+19
 Total Column (cm-2)




                       2,0E+19
                                         Zugspitze Solar FTIR
                       1,5E+19           CH4 columns
                                         for Sciamachy Validation
                       1,0E+19

                       5,0E+18

                       0,0E+00
                             Jul 02   Aug 02   Okt 02     Nov 02   Jan 03   Mrz 03   Apr 03   Jun 03
                                                        Time of year 2002/03
                              Karlsruhe Research Center

                              IMK-IFU Garmisch, Ralf Sussmann
Zugspitze FTIR: N2O Columns Series (15 July 2002 – 1 July 2003)

                       5,0E+18


                       4,0E+18
 Total Column (cm-2)




                       3,0E+18           Zugspitze Solar FTIR
                                         N2O Columns
                                         for Sciamachy Validation
                       2,0E+18


                       1,0E+18


                       0,0E+00
                             1. Jul 20. Aug 9. Okt 28. Nov 17. Jan 8. Mrz 27. Apr 16. Jun
                                                  Time of year 2002/03

                             Karlsruhe Research Center

                             IMK-IFU Garmisch, Ralf Sussmann
Sciamachy Validation by Zugspitze FTIR: Ozone FTIR versus SCIA DOAS1 (vis)



 FTIR: Individual
 measurements (10-
 20 min)

 SCIA: Individual
 pixels within 500 km
 radius for one
 overpass




   De Maziere et al.,
   Proc. ESA-ACVT
   Meeting, 2003




                Karlsruhe Research Center

                IMK-IFU Garmisch, Ralf Sussmann
Sciamachy Validation by Zugspitze FTIR: Ozone FTIR versus SCIA DOAS1 (vis)
                                                   FTIR Zugspitze Column
                                         1,8E+19   Version 3.53
                                                   Version 4.00
FTIR: Individual                         1,6E+19   Version 4.01
measurements                                       Version 3.51 + 3.52 data out of this scale
(10-20 min)        Total Column (cm-2)   1,4E+19

SCIA: Average                            1,2E+19
of all pixels
                                         1,0E+19
within 500 km
radius for one                           8,0E+18
overpass
                                         6,0E+18

                                         4,0E+18

                                         2,0E+18
                                               Jul 02 Aug 02 Okt 02 Nov 02 Jan 03 Mrz 03 Apr 03 Jun 03
                                                                           Time of year 2002/03
              Karlsruhe Research Center

              IMK-IFU Garmisch, Ralf Sussmann
Sciamachy Validation by Zugspitze FTIR: Ozone FTIR versus SCIA DOAS0 (UV)

                                                     FTIR Zugspitze Column
                                         1,4E+19
                                                     Version 3.51
FTIR: Individual                                     Version 3.52
measurements                             1,2E+19     Version 3.53
(10-20 min)        Total Column (cm-2)               Version 4.00
                                                     Version 4.01
SCIA: Average                            1,0E+19
of all pixels
within 500 km
radius for one                           8,0E+18
overpass

                                         6,0E+18


                                         4,0E+18
                                               Jul 02 Aug 02 Okt 02 Nov 02 Jan 03 Mrz 03 Apr 03 Jun 03
                                                                      Time of year 2002/03
              Karlsruhe Research Center

              IMK-IFU Garmisch, Ralf Sussmann
 Sciamachy Validation by Zugspitze FTIR: NO2 FTIR versus SCIA DOAS1 (vis)
                                       1,8E+16                                           FTIR Zugspitze Column
                                                                                         Version 3.51
                                       1,6E+16                                           Version 3.52
FTIR: Individual
                                                                                         Version 3.53
measurements     Total Column (cm-2)   1,4E+16                                           Version 4.00
(10-20 min)                                                                              Version 4.01
                                       1,2E+16
SCIA: Average                          1,0E+16
of all pixels
within 500 km                          8,0E+15
radius for one
                                       6,0E+15
overpass
                                       4,0E+15
                                       2,0E+15
                                       0,0E+00
                                             Jul 02 Aug 02 Okt 02 Nov 02 Jan 03 Mrz 03 Apr 03 Jun 03
                                                               Time of year 2002/03
              Karlsruhe Research Center

              IMK-IFU Garmisch, Ralf Sussmann
Sciamachy Validation by Zugspitze FTIR: Methane FTIR versus SCIA BIAS1 (NIR)

                                         1,0E+22
FTIR: Individual
measurements
(10-20 min)        Total Column (cm-2)
                                         1,0E+21
SCIA: Average
of all pixels                                                                           FTIR Zugspitze Column
                                                                                        Version 3.51
within 500 km
                                                                                        Version 3.52
radius for one                                                                          Version 3.53
overpass                                 1,0E+20
                                                                                        Version 4.00
                                                                                        Version 4.01




                                         1,0E+19
                                               Jul 02 Aug 02 Okt 02 Nov 02 Jan 03 Mrz 03 Apr 03 Jun 03
                                                                 Time of year 2002/03

              Karlsruhe Research Center

              IMK-IFU Garmisch, Ralf Sussmann
Sciamachy Validation by Zugspitze FTIR: Methane FTIR versus SCIA BIAS2 (NIR)
                                                                                     FTIR Zugspitze Column
                                    1,0E+22                                          Version 3.52
                                                                                     Version 3.51
FTIR: Individual
                                                                                     Version 3.53
measurements
                                                                                     Version 4.00
              Total Column (cm-2)
(10-20 min)                                                                          Version 4.01
                                    1,0E+21
SCIA: Average
of all pixels
within 500 km
radius for one
overpass                            1,0E+20




                                    1,0E+19
                                          Jul 02 Aug 02 Okt 02 Nov 02 Jan 03 Mrz 03 Apr 03 Jun 03
                                                            Time of year 2002/03
              Karlsruhe Research Center

              IMK-IFU Garmisch, Ralf Sussmann
Sciamachy Validation by Zugspitze FTIR: Methane FTIR versus SCIA WMF-DOAS



FTIR: Daily
average of day
956

SCIA: Data from
two orbits on day
953, longitudinal
windows +/-2.5°
and +/-5°



    De Maziere et al.,
    Proc. ESA-ACVT
    Meeting, 2003




                 Karlsruhe Research Center

                 IMK-IFU Garmisch, Ralf Sussmann
Sciamachy Validation by Zugspitze FTIR: N2O FTIR versus SCIA BIAS1 (NIR)
                                             FTIR Zugspitze Column
                                             version 3.51 + 3.52 not plotted (negative VMR´s)
                                             version 4.00
FTIR: Individual                         5,0E+18 4.01
                                             version
measurements
(10-20 min)
                                         4,0E+18
                   Total Column (cm-2)

SCIA:
Individual                               3,0E+18
pixels within
500 km radius
for one                                  2,0E+18
overpass
                                         1,0E+18


                                         1,0E+00
                                               Jul 02 Aug 02 Okt 02 Nov 02 Jan 03 Mrz 03 Apr 03 Jun 03
                                                                           Time of year 2002/03
              Karlsruhe Research Center

              IMK-IFU Garmisch, Ralf Sussmann
Sciamachy Validation by Zugspitze FTIR: CO FTIR versus SCIA BIAS2 (NIR)
                                                      FTIR Zugspitze Column
                                                      version 3.51
                                                      version 3.52 data out of this scale
                                            2,0E+18   version 3.53
FTIR: Individual
                                                      version 4.00
measurements
                                                      version 4.01
(10-20 min)
                   Vertical Column (cm-2)
                                            1,6E+18

SCIA: Average
of all pixels                               1,2E+18
within 500 km
radius for one
                                            8,0E+17
overpass

                                            4,0E+17


                                            0,0E+00
                                                  Jul 02 Aug 02 Okt 02 Nov 02 Jan 03 Mrz 03 Apr 03 Jun 03
                                                                             Time of year 2002/03
              Karlsruhe Research Center

              IMK-IFU Garmisch, Ralf Sussmann
Sciamachy Validation by Zugspitze FTIR: Conclusions July 2003

1. The operational SCIAMACHY UV total ozone product was improved from
   version to version. Version (4.01) is good (nearly zero bias, realistic day-to-
   day scatter).
2. The operational SCIAMACHY vis total ozone product was off by orders of
   magnitude for versions 3.51, 3.52. The later versions are good on >monthly
   average, but there is scatter in daily columns (pixels average over 500 km
   radius) exceeding natural scatter by factors.
3. The operational SCIAMACHY vis NO2 total column product overestimates the
   real columns in early versions. Extremely off in version 4.0. Underestimation
   in the latest version (4.01, since 15 April 03). However, version 4.01 seems to
   deliver constant values around the columns typically found for February. I.e.,
   it does not monitor the columns increase during the spring/early summer
   period.
4. Operational SCIAMACHY near IR products (CO, CH4, N2O) have no
   significant meaning up to now. Scientific WMF-DOAS relatively good for CH4.
           Karlsruhe Research Center

           IMK-IFU Garmisch, Ralf Sussmann

				
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