Mercury Speciation at a Coastal Site in the Northern Gulf of Mexico: Results from the Grand Bay Intensive Studies in Summer 2010 and Spring 2011

被引：16

作者：

Ren, Xinrong ^{[1
,2
,7
]}

Luke, Winston T. ^{[1
]}

Kelley, Paul ^{[1
,2
]}

Cohen, Mark ^{[1
]}

Ngan, Fong ^{[1
,2
]}

Artz, Richard ^{[1
]}

Walker, Jake ^{[3
]}

Brooks, Steve ^{[1
]}

Moore, Christopher ^{[4
]}

Swartzendruber, Phil ^{[5
]}

Bauer, Dieter ^{[5
]}

Remeika, James ^{[5
]}

Hynes, Anthony ^{[5
]}

Dibb, Jack ^{[6
]}

Rolison, John ^{[7
]}

Krishnamurthy, Nishanth ^{[7
]}

Landing, William M. ^{[7
]}

Hecobian, Arsineh ^{[8
]}

Shook, Jeffery ^{[8
]}

Huey, L. Greg ^{[8
]}

机构：

[1] NOAA, Air Resources Lab, College Pk, MD 20740 USA

[2] Univ Maryland, Cooperat Inst Climate & Satellites, College Pk, MD 20740 USA

[3] Grand Bay Natl Estuarine Res Reserve, Moss Point, MS 39562 USA

[4] Desert Res Inst, Div Atmospher Sci, Reno, NV 89512 USA

[5] Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Miami, FL 33149 USA

[6] Univ New Hampshire, Inst Study Earth Oceans & Space, Earth Syst Res Ctr, Durham, NH 03824 USA

[7] Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA

[8] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA

来源：

ATMOSPHERE | 2014年 / 5卷 / 02期

关键词：

atmospheric mercury; gaseous elemental mercury; gaseous oxidized mercury; particulate-bound mercury; Gulf of Mexico; principal component analysis; HYSPLIT; GASEOUS ELEMENTAL MERCURY; ATMOSPHERIC MERCURY; PRINCIPAL COMPONENT; AMBIENT AIR; LEAD; 210; DEPLETION; POLLUTION; OZONE; OXIDATION; EXPOSURE;

D O I：

10.3390/atmos5020230

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

During two intensive studies in summer 2010 and spring 2011, measurements of mercury species including gaseous elemental mercury (GEM), gaseous oxidized mercury (GOM), and particulate-bound mercury (PBM), trace chemical species including O-3, SO2, CO, NO, NOY, and black carbon, and meteorological parameters were made at an Atmospheric Mercury Network (AMNet) site at the Grand Bay National Estuarine Research Reserve (NERR) in Moss Point, Mississippi. Surface measurements indicate that the mean mercury concentrations were 1.42 +/- 0.12 ng.m(-3) for GEM, 5.4 +/- 10.2 pg.m(-3) for GOM, and 3.1 +/- 1.9 pg.m(-3) for PBM during the summer 2010 intensive and 1.53 +/- 0.11 ng.m(-3) for GEM, 5.3 +/- 10.2 pg.m(-3) for GOM, and 5.7 +/- 6.2 pg.m(-3) for PBM during the spring 2011 intensive. Elevated daytime GOM levels (>20 pg.m(-3)) were observed on a few days in each study and were usually associated with either elevated O-3 (>50 ppbv), BrO, and solar radiation or elevated SO2 (>a few ppbv) but lower O-3 (similar to 20-40 ppbv). This behavior suggests two potential sources of GOM: photochemical oxidation of GEM and direct emissions of GOM from nearby local sources. Lack of correlation between GOM and Beryllium-7 (Be-7) suggests little influence on surface GOM from downward mixing of GOM from the upper troposphere. These data were analyzed using the HYSPLIT back trajectory model and principal component analysis in order to develop source-receptor relationships for mercury species in this coastal environment. Trajectory frequency analysis shows that high GOM events were generally associated with high frequencies of the trajectories passing through the areas with high mercury emissions, while low GOM levels were largely associated the trajectories passing through relatively clean areas. Principal component analysis also reveals two main factors: direct emission and photochemical processes that were clustered with high GOM and PBM. This study indicates that the receptor site, which is located in a coastal environment of the Gulf of Mexico, experienced impacts from mercury sources that are both local and regional in nature.

引用

页码：230 / 251

页数：22

共 42 条

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