气候变化领域集成服务门户(CCPortal): Large subglacial source of mercury from the southwestern margin of the Greenland Ice Sheet

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DOI	10.1038/s41561-021-00753-w
	Large subglacial source of mercury from the southwestern margin of the Greenland Ice Sheet
	Hawkings J.R.; Linhoff B.S.; Wadham J.L.; Stibal M.; Lamborg C.H.; Carling G.T.; Lamarche-Gagnon G.; Kohler T.J.; Ward R.; Hendry K.R.; Falteisek L.; Kellerman A.M.; Cameron K.A.; Hatton J.E.; Tingey S.; Holt A.D.; Vinšová P.; Hofer S.; Bulínová M.; Větrovský T.; Meire L.; Spencer R.G.M.
发表日期	2021
ISSN	17520894
起始页码	496
结束页码	502
卷号	14 期号:7
英文摘要	The Greenland Ice Sheet is currently not accounted for in Arctic mercury budgets, despite large and increasing annual runoff to the ocean and the socio-economic concerns of high mercury levels in Arctic organisms. Here we present concentrations of mercury in meltwaters from three glacial catchments on the southwestern margin of the Greenland Ice Sheet and evaluate the export of mercury to downstream fjords based on samples collected during summer ablation seasons. We show that concentrations of dissolved mercury are among the highest recorded in natural waters and mercury yields from these glacial catchments (521–3,300 mmol km−2 year−1) are two orders of magnitude higher than from Arctic rivers (4–20 mmol km−2 year−1). Fluxes of dissolved mercury from the southwestern region of Greenland are estimated to be globally significant (15.4–212 kmol year−1), accounting for about 10% of the estimated global riverine flux, and include export of bioaccumulating methylmercury (0.31–1.97 kmol year−1). High dissolved mercury concentrations (~20 pM inorganic mercury and ~2 pM methylmercury) were found to persist across salinity gradients of fjords. Mean particulate mercury concentrations were among the highest recorded in the literature (~51,000 pM), and dissolved mercury concentrations in runoff exceed reported surface snow and ice values. These results suggest a geological source of mercury at the ice sheet bed. The high concentrations of mercury and its large export to the downstream fjords have important implications for Arctic ecosystems, highlighting an urgent need to better understand mercury dynamics in ice sheet runoff under global warming. © 2021, The Author(s).
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206904
作者单位	National High Magnetic Field Laboratory Geochemistry Group and Earth, Ocean, and Atmospheric Sciences, Florida State University, Tallahassee, FL, United States; German Research Centre for Geosciences GFZ, Potsdam, Germany; Woods Hole Oceanographic Institution, Woods Hole, MA, United States; School of Geographical Sciences, University of Bristol, Bristol, United Kingdom; Centre for Arctic Gas Hydrate, Environment and Climate (CAGE), Department of Geosciences, UiT The Arctic University of Norway, Tromsø, Norway; Department of Ecology, Faculty of Science, Charles University, Prague, Czech Republic; Department of Ocean Sciences, University of California, Santa Cruz, CA, United States; Department of Geological Sciences, Brigham Young University, Provo, UT, United States; Stream Biofilm and Ecosystem Research Laboratory, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; School of Earth Sciences, University of Bristol, Bristol, United Ki...
推荐引用方式 GB/T 7714	Hawkings J.R.,Linhoff B.S.,Wadham J.L.,et al. Large subglacial source of mercury from the southwestern margin of the Greenland Ice Sheet[J],2021,14(7).
APA	Hawkings J.R..,Linhoff B.S..,Wadham J.L..,Stibal M..,Lamborg C.H..,...&Spencer R.G.M..(2021).Large subglacial source of mercury from the southwestern margin of the Greenland Ice Sheet.Nature Geoscience,14(7).
MLA	Hawkings J.R.,et al."Large subglacial source of mercury from the southwestern margin of the Greenland Ice Sheet".Nature Geoscience 14.7(2021).