气候变化领域集成服务门户(CCPortal): Firn data compilation reveals widespread decrease of firn air content in western Greenland

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DOI	10.5194/tc-13-845-2019
	Firn data compilation reveals widespread decrease of firn air content in western Greenland
	Vandecrux B.; MacFerrin M.; MacHguth H.; Colgan W.T.; Van As D.; Heilig A.; Max Stevens C.; Charalampidis C.; Fausto R.S.; Morris E.M.; Mosley-Thompson E.; Koenig L.; Montgomery L.N.; Miège C.; Simonsen S.B.; Ingeman-Nielsen T.; Box J.E.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	845
结束页码	859
卷号	13 期号:3
英文摘要	A porous layer of multi-year snow known as firn covers the Greenland-ice-sheet interior. The firn layer buffers the ice-sheet contribution to sea-level rise by retaining a fraction of summer melt as liquid water and refrozen ice. In this study we quantify the Greenland ice-sheet firn air content (FAC), an indicator of meltwater retention capacity, based on 360 point observations. We quantify FAC in both the uppermost 10m and the entire firn column before interpolating FAC over the entire ice-sheet firn area as an empirical function of long-term mean air temperature (Ta) and net snow accumulation ( P c/. We estimate a total ice-sheet-wide FAC of 26800±1840 km3, of which 6500±450 km3 resides within the uppermost 10m of firn, for the 2010-2017 period. In the dry snow area (Ta ≤-19 °C), FAC has not changed significantly since 1953. In the low-accumulation percolation area (Ta >-19 °C and c ≤ 600 mmw.e. yr-1/, FAC has decreased by 23±16% between 1998-2008 and 2010-2017. This reflects a loss of firn retention capacity of between 150±100 Gt and 540±440 Gt, respectively, from the top 10m and entire firn column. The top 10m FACs simulated by three regional climate models (HIRHAM5, RACMO2.3p2, and MARv3.9) agree within 12% with observations. However, model biases in the total FAC and marked regional differences highlight the need for caution when using models to quantify the current and future FAC and firn retention capacity. © 2019 Author(s).
学科领域	air temperature; climate modeling; data acquisition; data set; meltwater; regional climate; sea level change; seasonal variation; snow accumulation; Arctic; Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	air temperature; climate modeling; data acquisition; data set; meltwater; regional climate; sea level change; seasonal variation; snow accumulation; Arctic; Greenland; Greenland Ice Sheet
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118912
作者单位	Department of Glaciology and Climate, Geological Survey of Denmark and Greenland, Copenhagen, Denmark; Department of Civil Engineering, Technical University of Denmark, Kongens Lyngby, Denmark; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; Department of Geosciences, University of Fribourg, Fribourg, Switzerland; Department of Geography, University of Zurich, Zurich, Switzerland; Department of Earth and Environmental Sciences, Ludwig Maximilian University, Munich, Germany; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Bavarian Academy of Sciences and Humanities, Munich, Germany; Scott Polar Research Institute, Cambridge University, Cambridge, United Kingdom; Byrd Polar and Climate Research Center, Department of Geography, Ohio State University, Columbus, OH, United States; National Snow and Ice Data Center, University of Colorado, Boulder, CO, United States; Department of Geography, Rutgers U...
推荐引用方式 GB/T 7714	Vandecrux B.,MacFerrin M.,MacHguth H.,et al. Firn data compilation reveals widespread decrease of firn air content in western Greenland[J],2019,13(3).
APA	Vandecrux B..,MacFerrin M..,MacHguth H..,Colgan W.T..,Van As D..,...&Box J.E..(2019).Firn data compilation reveals widespread decrease of firn air content in western Greenland.The Cryosphere,13(3).
MLA	Vandecrux B.,et al."Firn data compilation reveals widespread decrease of firn air content in western Greenland".The Cryosphere 13.3(2019).