气候变化领域集成服务门户(CCPortal): Increasing surface runoff from Greenland's firn areas

CCPortal

DOI	10.1038/s41558-022-01371-z
	Increasing surface runoff from Greenland's firn areas
	Tedstone, Andrew J.; Machguth, Horst
发表日期	2022
ISSN	1758-678X
EISSN	1758-6798
起始页码	672
结束页码	+
卷号	12 期号:7 页码:17
英文摘要	Ice that melts at high elevation often refreezes and, therefore, does not contribute to the shrinking of ice sheets. Here, the authors show that the elevation at which melting ice starts to contribute to runoff has increased over recent years in Greenland, expanding the runoff area by 29%. At high elevations of ice sheets, melting snow generally percolates and refreezes, so does not contribute to the shrinking of the ice sheet. Here, we systematically map the runoff area of the Greenland ice sheet using surface rivers visible on satellite imagery. Between 1985 and 2020, the maximum runoff elevation rose by 58-329 metres, expanding the runoff area by 29% (-8%/+6%). Excess melt beyond the refreezing capacity of pores in snowfall has created near-impermeable ice slabs that sustain surface runoff even in cooler summers. We show that two surface mass balance models over-estimate the runoff area by 16-30%. Once restricted to our observed areas, they indicate that 5-10% of recent runoff probably comes from the expanded runoff area. Runoff from higher elevations is sensitive to projected warming as further increases in the runoff limit will increase the runoff area disproportionately.
学科领域	Environmental Sciences; Environmental Studies; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000812026800002
来源期刊	NATURE CLIMATE CHANGE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/274133
作者单位	University of Fribourg
推荐引用方式 GB/T 7714	Tedstone, Andrew J.,Machguth, Horst. Increasing surface runoff from Greenland's firn areas[J],2022,12(7):17.
APA	Tedstone, Andrew J.,&Machguth, Horst.(2022).Increasing surface runoff from Greenland's firn areas.NATURE CLIMATE CHANGE,12(7),17.
MLA	Tedstone, Andrew J.,et al."Increasing surface runoff from Greenland's firn areas".NATURE CLIMATE CHANGE 12.7(2022):17.