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/m^2h) ± standard deviation	GOM dry dep. estimate (ng/m^2)	Mercury wet dep. (ng/m^2)	GOM dry dep. + mercury wet dep. estimates (ng/m^2)	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]	2172 m	368	1.2 ± 0.7	10889	8289	19178	57	2409 MW-Hg
Reno, Nevada (10/06–10/08; Lyman et al. 2009) [9]	1340 m	59	1.0 ± 0.8	6800	1500	8300	82
Yorkville, Georgia (10/06–10/08; Lyman et al. 2009) [9]	394 m	1175	0.2 ± 0.2	1900	10700	12600	15
Tampa, Florida (7/09-7/10; Peterson et al. 2012) [10]	4 m	1248 mean estimate	0.2 ± 0.1	2949	18217	21166	14
Pensacola, Florida (10/06–10/08; Lyman et al. 2009) [9]	44 m	1791	0.1 ± 0.1	700	13600	14300	5
Western Maryland (9/09-9/10; Castro et al. 2012) [6]	869 m	not given	0.4 estimated	2530	7700	10230	25