Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-19-6913-2019 |
Mercury and trace metal wet deposition across five stations in Alaska: controlling factors, spatial patterns, and source regions | |
Pearson, Christopher1; Howard, Dean2; Moore, Christopher3,4; Obrist, Daniel2,3 | |
2019-05-23 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2019 |
卷号 | 19期号:10页码:6913-6929 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A total of 1360 weeks of mercury (Hg) wet deposition data were collected by the state of Alaska Department of Environmental Conservation and the U.S. National Park Service across five stations spanning up to 8 years. Here, we analyze concentration patterns, source regions, and seasonal and annual Hg deposition loadings across these five sites in Alaska, along with auxiliary trace metals including Cr, Ni, As, and Pb. We found that Hg concentrations in precipitation at the two northernmost stations, Nome (64.5 degrees N) along the coast of the Bering Sea and the inland site of Gates of the Arctic (66.9 degrees N), were statistically higher (average of 5.3 and 5.5 ng L-1, respectively) than those at the two lowest-latitude sites, Kodiak Island (57.7 degrees N, 2.7 ng degrees N) and Glacier Bay (58.5 degrees N, 2.6 ng L-1) . These differences were largely explained by different precipitation regimes, with higher precipitation at the lower- latitude stations leading to dilution effects. The highest annual Hg deposition loads were consistently observed at Kodiak Island (4.80 +/- 1.04 mu g m(-2)), while the lowest annual deposition was at Gates of the Arctic (2.11 +/- 0.67 mu g m(-2)). Across all stations and collection years, annual precipitation strongly controlled annual Hg deposition, explaining 73% of the variability in observed annual Hg deposition. The data further showed that annual Hg deposition loads across all five Alaska sites were consistently among the lowest in the United States, ranking in the lowest 1% to 5% of over 99 monitoring stations. Detailed back-trajectory analyses showed diffuse source regions for most Hg deposition sites suggesting largely global or regional Hg sources. One notable exception was Nome, where we found increased Hg contributions from the western Pacific Ocean downwind of East Asia. Analysis of other trace elements (As, Cr, Cu, Ni, Pb, Se, Zn) from Dutch Harbor, Nome, and Kodiak Island showed generally higher trace metal concentrations at the northern station Nome compared to Kodiak Island further to the south, with concentrations at Dutch Harbor falling in between. Across all sites, we find two distinct groups of correlating elements: Cr and Ni and As and Pb. We attribute these associations to possibly different source origins, whereby sources of Ni and Cr may be derived from crustal (e.g., dust) sources while As and Pb may include long-range transport of anthropogenic pollution. Hg was not strongly associated with either of these two groups. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000468810000003 |
WOS关键词 | ATMOSPHERIC MERCURY ; VOLCANIC EMISSIONS ; GASEOUS MERCURY ; NORTH-AMERICA ; UNITED-STATES ; METHYLMERCURY ; SNOW ; PRECIPITATION ; ELEMENTS ; BIOMAGNIFICATION |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/183324 |
专题 | 地球科学 |
作者单位 | 1.Desert Res Inst, Div Hydrol Sci, Reno, NV USA; 2.Univ Massachusetts Lowell, Dept Environm Earth & Atmospher Sci, Lowell, MA 01854 USA; 3.Desert Res Inst, Div Atmospher Sci, Reno, NV 89512 USA; 4.Inst Gas Technol, Des Plaines, IL USA |
推荐引用方式 GB/T 7714 | Pearson, Christopher,Howard, Dean,Moore, Christopher,et al. Mercury and trace metal wet deposition across five stations in Alaska: controlling factors, spatial patterns, and source regions[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(10):6913-6929. |
APA | Pearson, Christopher,Howard, Dean,Moore, Christopher,&Obrist, Daniel.(2019).Mercury and trace metal wet deposition across five stations in Alaska: controlling factors, spatial patterns, and source regions.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(10),6913-6929. |
MLA | Pearson, Christopher,et al."Mercury and trace metal wet deposition across five stations in Alaska: controlling factors, spatial patterns, and source regions".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.10(2019):6913-6929. |
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