Gaseous Oxidized Mercury Dry Deposition Measurements in the Southwestern USA: A Comparison between Texas, Eastern Oklahoma, and the Four Corners Area
Table 2
Annual GOM dry deposition (dep.) estimates and mercury wet deposition data, elevation, precipitation, and modified coal-fired power plant electricity capacity data for Texas and Eastern Oklahoma sites and other comparison sites, September 27, 2011-September 25, 2012 for Texas and Eastern Oklahoma sites (except as noted); asl: above sea level; na: not available; h: hour; Hg: mercury; total mercury deposition estimates = GOM dry deposition estimates + mercury wet deposition data; comparison of GOM data for 10/06–10/08 sites could be higher by 0.2 ng/m2h.
Site
Elevation (asl)
Precipitation (mm)
Surrogate surface dep. rate estimate (ng/m2h) ± standard deviation
GOM dry dep. estimate (ng/m2)
Mercury wet dep. (ng/m2)
GOM dry dep. + mercury wet dep. estimates (ng/m2)
GOM dry dep. % of total mercury dep. estimate
Total modified coal-fired power plant electricity capacity (MW) which is outputting Hg emissions within 100 km of sites (Texas and Eastern Oklahoma and Mesa Verde National Park sites only)
Corsicana (TX97)
128 m
na
0.3 ± 0.1
2996
na
na
na
1964 MW-Hg
Longview (TX21)
110 m
1158
0.2 ± 0.1
1486
11902
13388
11
2672 MW-Hg
Karnack (TX99)
85 m
1074
0.2 ± 0.1
1313
na
na
na
3322 MW-Hg
Fort Parker State Park (TX98)
163 m
na
0.1 ± 0.0
1142
na
na
na
2269 MW-Hg
Stilwell (OK99)
304 m
1010
0.2 ± 0.1
2089
9869
11958
17
3405 MW-Hg
Stilwell (OK99)—8/09-8/10; Sather et al. 2013 [11]
304 m
1591
0.1 ± 0.1
1118
13452
14570
8
3405 MW-Hg
Stilwell (OK99)—8/10-8/11; Sather et al. 2013 [11]
304 m
1247
0.3 ± 0.1
2350
13263
15613
15
3405 MW-Hg
Annual comparison sites
Mesa Verde National Park (CO99)—highest annual GOM dry deposition estimate site in Four Corners area (8/10-8/11; Sather et al. 2013) [11]