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DOI	10.5194/tc-12-1939-2018
	Mercury in the Arctic tundra snowpack: Temporal and spatial concentration patterns and trace gas exchanges
	Agnan Y.; Douglas T.A.; Helmig D.; Hueber J.; Obrist D.
发表日期	2018
ISSN	19940416
卷号	12 期号:6
英文摘要	In the Arctic, the snowpack forms the major interface between atmospheric and terrestrial cycling of mercury (Hg), a global pollutant. We investigated Hg dynamics in an interior Arctic tundra snowpack in northern Alaska during two winter seasons. Using a snow tower system to monitor Hg trace gas exchange, we observed consistent concentration declines of gaseous elemental Hg (Hg0 gas) from the atmosphere to the snowpack to soils. The snowpack itself was unlikely a direct sink for atmospheric Hg0 gas. In addition, there was no evidence of photochemical reduction of HgII to Hg0 gas in the tundra snowpack, with the exception of short periods during late winter in the uppermost snow layer. The patterns in this interior Arctic snowpack thus differ substantially from observations in Arctic coastal and temperate snowpacks. We consistently measured low concentrations of both total and dissolved Hg in snowpack throughout the two seasons. Chemical tracers showed that Hg was mainly associated with local mineral dust and regional marine sea spray inputs. Mass balance calculations show that the snowpack represents a small reservoir of Hg, resulting in low inputs during snowmelt. Taken together, the results from this study suggest that interior Arctic snowpacks are negligible sources of Hg to the Arctic. © Author(s) 2018.
学科领域	air-soil interaction; gas exchange; mercury (element); pollutant source; reservoir; seasonal variation; snowpack; terrestrial environment; trace gas; tundra; Alaska; Arctic; United States
语种	英语
scopus关键词	air-soil interaction; gas exchange; mercury (element); pollutant source; reservoir; seasonal variation; snowpack; terrestrial environment; trace gas; tundra; Alaska; Arctic; United States
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119134
作者单位	Sorbonne Université, CNRS, EPHE, UMR Metis, Paris, 75252, France; Division of Atmospheric Sciences, Desert Research Institute, Reno, NV 89523, United States; US Army Cold Regions Research and Engineering Laboratory, PO Box 35170, Fort Wainwright, AK 99709, United States; Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO 80309, United States; Department of Environmental, Earth, and Atmospheric Sciences, University of Massachusetts, Lowell, MA 01854, United States
推荐引用方式 GB/T 7714	Agnan Y.,Douglas T.A.,Helmig D.,et al. Mercury in the Arctic tundra snowpack: Temporal and spatial concentration patterns and trace gas exchanges[J],2018,12(6).
APA	Agnan Y.,Douglas T.A.,Helmig D.,Hueber J.,&Obrist D..(2018).Mercury in the Arctic tundra snowpack: Temporal and spatial concentration patterns and trace gas exchanges.Cryosphere,12(6).
MLA	Agnan Y.,et al."Mercury in the Arctic tundra snowpack: Temporal and spatial concentration patterns and trace gas exchanges".Cryosphere 12.6(2018).