气候变化领域集成服务门户(CCPortal): Extreme melt season ice layers reduce firn permeability across Greenland

CCPortal

DOI	10.1038/s41467-021-22656-5
	Extreme melt season ice layers reduce firn permeability across Greenland
	Culberg R.; Schroeder D.M.; Chu W.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	Surface meltwater runoff dominates present-day mass loss from the Greenland Ice Sheet. In Greenland’s interior, porous firn can limit runoff by retaining meltwater unless perched low-permeability horizons, such as ice slabs, develop and restrict percolation. Recent observations suggest that such horizons might develop rapidly during extreme melt seasons. Here we present radar sounding evidence that an extensive near surface melt layer formed following the extreme melt season in 2012. This layer was still present in 2017 in regions up to 700 m higher in elevation and 160 km further inland than known ice slabs. We find that melt layer formation is driven by local, short-timescale thermal and hydrologic processes in addition to mean climate state. These melt layers reduce vertical percolation pathways, and, under appropriate firn temperature and surface melt conditions, encourage further ice aggregation at their horizon. Therefore, the frequency of extreme melt seasons relative to the rate at which pore space and cold content regenerates above the most recent melt layer may be a key determinant of the firn’s multi-year response to surface melt. © 2021, The Author(s).
语种	英语
scopus关键词	article; climate; cold stress; Greenland; season; telecommunication
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250709
作者单位	Department of Electrical Engineering, Stanford University, Stanford, CA, United States; Department of Geophysics, Stanford University, Stanford, CA, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States
推荐引用方式 GB/T 7714	Culberg R.,Schroeder D.M.,Chu W.. Extreme melt season ice layers reduce firn permeability across Greenland[J],2021,12(1).
APA	Culberg R.,Schroeder D.M.,&Chu W..(2021).Extreme melt season ice layers reduce firn permeability across Greenland.Nature Communications,12(1).
MLA	Culberg R.,et al."Extreme melt season ice layers reduce firn permeability across Greenland".Nature Communications 12.1(2021).