South Carolina
AERMOD Meteorological
Data Processing:
Selected Highlights of
2002-06 Update
John Glass
SC BAQ
Why update from ‟87-91 to ‟02-06 ?
►“Consecutive years from the most recent,
readily available 5-year period are
preferred.” (EPA 40 CFR, Part 51, Appdx W)
►Improve station representativeness by
increasing no. of stations (# of sfc met.
stations w/ 5-yrs of data has increased due
to ASOS implementation)
►Incorporate “new” AERSURFACE (Jan ‟08)
Overview
AERSURFACE
Surface Obs
AERMET
Upper Air
Soundings
SC Station
Representativeness AERMOD-Ready
Met Data
Analysis Data sets
Zones
“Raw” Meteorological Data
► Surface Observations
● ISHD (NCDC download:
htp://ftp.ncdc.noaa.gov/pub/data/noaa)
●16 stations (SC-12, NC-2, GA-2)
► Upper Air Soundings
● ESRL/NOAA database:
http://raob.fsl.noaa.gov/
AERSURFACE
►Thoroughly researched anemometer Lat/Lon
● Coords per NCDC / NWS can be imprecise and/or
inaccurate (as suggested in AERSFC User‟s Guide)
● General Location (and any special info) – per verbal
contact with NWS offices
► Example: anemometers are generally co-located
with other ASOS instruments, but GSP anemometer is
separated ~0.6 mi (~1 km) from other ASOS instruments
[1 km = radius of surface roughness evaluation !].
● Aerial Photos / GIS for accurate locn (6 decimal digits)
.
AERMET
REPAIRED missing data to increase no. of useable stations
► Missing Data per AERMET Stage1 QA Report
SURFACE DATA |------VIOLATION SUMMARY------|
TOTAL # LOWER UPPER %
# OBS MISSING BOUND BOUND ACCEPTED
TMPD 8487 58 0 4 99.27
WDIR 8487 1187 0 0 86.01
WSPD 8487 203 0 0 97.61
► Per EPA Memo (“Procedures for Substituting Values for
Missing NWS Meteorological Data for Use in Regulatory Air
Quality Models”, Dennis Atkinson and Russell F. Lee,
7/07/92):
● Data sets = 22 >= 22
17 - 21 17 - 21
WIND ROSE PLOT: DISPLAY: 11 - 17 WIND ROSE PLOT: DISPLAY: 11 - 17
SOUTH
CHARLOTTE ... 2002-06 SOUTH
... Annual Wind Speed 7 - 11 Columbia ... 2002-06 ... Annual Wind Speed
Direction (blowing from)
7 - 11
Direction (blowing from)
4-7 4-7
1-4 1-4
Calms: 18.71% Calms: 22.30%
COMMENTS: DATA PERIOD: NORTH COMPANY NAME: COMMENTS: DATA PERIOD:
NORTH
COMPANY NAME:
per AERMET .sfc files 2002 2003 2004 2005 2006 SC-DHEC per AERMET .sfc files 2002 2003 2004 2005 2006 SC-DHEC
Jan 1 - Dec 31 ("fixed" msg wdir) Jan 1 - Dec 31
00:00 - 23:00 MODELER: 00:00 - 23:00 MODELER:
Smutz 10% Smutz 5%
CALM WINDS: TOTAL COUNT: CALM WINDS: TOTAL COUNT:
8% 4%
18.71% 41259 hrs. 22.30% 39424 hrs.
AVG. WIND SPEED: DATE: 6% PROJECT NO.: AVG. WIND SPEED: DATE: 3% PROJECT NO.:
5.53 Knots 11/21/2008 4.98 Knots 11/21/2008
CAE
4%
GRD
2%
WRPLOT View - Lakes Environmental Software WRPLOT View - Lakes Environmental Software
2% 1%
WEST EAST WEST EAST
WIND SPEED WIND SPEED
(Knots) (Knots)
>= 22 >= 22
17 - 21
17 - 21
11 - 17
11 - 17
SOUTH SOUTH
7 - 11
7 - 11
4-7
4-7
1-4
1-4
Calms: 23.98%
Calms: 21.82%
COMMENTS: DATA PERIOD: COMPANY NAME:
COMMENTS: DATA PERIOD: COMPANY NAME:
Terrain
● Example impact: led in part to decision to split Laurens Co.
between GSP and GRD
948‟
630‟
Land Use (NLCD 2001)
● Main utility: ensure consistency (broad-scale) in land use
within each final met. area
Facility Locations
● Example impact -- led to decision to include Kershaw Co. in
CAE (vs. FLO) area
FLO
CAE
Final Map
1987-91 vs. 2002-06
1987-91
7 Stations
2002-06
12 Stations
►COMMENTS ??
►QUESTIONS ??
John Glass, 803-898-4074,
glassjp@dhec.sc.gov