气候变化领域集成服务门户(CCPortal): Rapid and sensitive response of Greenland’s groundwater system to ice sheet change

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DOI	10.1038/s41561-021-00813-1
	Rapid and sensitive response of Greenland’s groundwater system to ice sheet change
	Liljedahl L.C.; Meierbachtol T.; Harper J.; van As D.; Näslund J.-O.; Selroos J.-O.; Saito J.; Follin S.; Ruskeeniemi T.; Kontula A.; Humphrey N.
发表日期	2021
ISSN	1752-0894
卷号	14 期号:10
英文摘要	Greenland Ice Sheet mass loss is impacting connected terrestrial and marine hydrologic systems with global consequences. Groundwater is a key component of water cycling in the Arctic, underlying the 1.7e6 km2 ice sheet and forming offshore freshwater reserves. However, despite its vast extent, the response of Greenland’s groundwater to ongoing ice sheet change is unknown. Here we present in-situ observations of deep groundwater conditions under the Greenland Ice Sheet, obtained in a 651-metre-long proglacial bedrock borehole angled under the ice sheet margin. We find that Greenland’s groundwater system responds rapidly and sensitively to relatively minor ice sheet forcing. Hydraulic head clearly varies over multi-annual, seasonal and diurnal timescales, which we interpret as a response to fluid pressure forcing at the ice/bed interface associated with changes in overlying ice loading and ice sheet hydrology. We find a systematic decline in hydraulic head over the eight-year observational period is linked primarily to ice sheet mass loss. Ongoing and future ice thinning will probably reduce groundwater discharge rates, with potential impacts to submarine freshwater discharge, freshwater delivery to fjords and biogeochemical fluxes in the Arctic. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	biogeochemical cycle; groundwater; hydraulic head; ice sheet; loading; Arctic; Greenland; Greenland Ice Sheet
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/250855
作者单位	Svensk Kärnbränslehantering AB, Solna, Sweden; Department of Geosciences, University of Montana, Missoula, MT, United States; Geological Survey of Denmark and Greenland, Copenhagen, Denmark; Greenland Guidance, Utrecht, Netherlands; Golder Associates AB, Stockholm, Sweden; Geological Survey of Finland, Espoo, Finland; Posiva Oy, Eurajoki, Finland; Department of Geology and Geophysics, University of Wyoming, Laramie, WY, United States; DHI, Stockholm, Sweden
推荐引用方式 GB/T 7714	Liljedahl L.C.,Meierbachtol T.,Harper J.,等. Rapid and sensitive response of Greenland’s groundwater system to ice sheet change[J],2021,14(10).
APA	Liljedahl L.C..,Meierbachtol T..,Harper J..,van As D..,Näslund J.-O..,...&Humphrey N..(2021).Rapid and sensitive response of Greenland’s groundwater system to ice sheet change.Nature Geoscience,14(10).
MLA	Liljedahl L.C.,et al."Rapid and sensitive response of Greenland’s groundwater system to ice sheet change".Nature Geoscience 14.10(2021).