气候变化领域集成服务门户(CCPortal): Variable temperature thresholds of melt pond formation on Antarctic ice shelves

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DOI	10.1038/s41558-022-01577-1
	Variable temperature thresholds of melt pond formation on Antarctic ice shelves
	van Wessem, J. Melchior; van den Broeke, Michiel R. R.; Wouters, Bert; Lhermitte, Stef
发表日期	2023
ISSN	1758-678X
EISSN	1758-6798
起始页码	161
结束页码	+
卷号	13 期号:2
英文摘要	Melt ponding is an important process for the stability of ice shelves. Here the authors estimate the temperature thresholds at which melt ponding emerges over Antarctic ice shelves and find that cold and dry ice shelves are more vulnerable to melt ponding than expected. It has been argued that the -5 degrees C annual mean 2 m air temperature isotherm defines a limit of ice shelf viability on the Antarctic Peninsula as melt ponding increases at higher temperatures. It is, however, presently unknown whether this threshold can also be applied to other Antarctic ice shelves. Here we use two present-day and three future high-resolution Antarctic climate simulations to predict warming thresholds for Antarctic ice shelf melt pond formation on the basis of the melt-over-accumulation ratio. The associated warming thresholds match well with observed melt pond volumes and are found to be spatially highly variable and controlled by snow accumulation. For relatively wet ice shelves, the -5 degrees C temperature threshold was confirmed; but cold and dry ice shelves such as Amery, Ross and Filchner-Ronne are more vulnerable than previously thought, with threshold temperatures well below -15 degrees C. Coupled Model Intercomparison Project Phase 6 models predict that towards the end of this century these thresholds can be reached on many ice shelves, even on cold ice shelves and under moderate warming scenarios.
英文关键词	SURFACE MASS-BALANCE; CLIMATE; MELTWATER; PENINSULA; MODEL
WOS研究方向	Environmental Sciences ; Environmental Studies ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000923635600001
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/282502
作者单位	Utrecht University; Delft University of Technology; KU Leuven
推荐引用方式 GB/T 7714	van Wessem, J. Melchior,van den Broeke, Michiel R. R.,Wouters, Bert,et al. Variable temperature thresholds of melt pond formation on Antarctic ice shelves[J],2023,13(2).
APA	van Wessem, J. Melchior,van den Broeke, Michiel R. R.,Wouters, Bert,&Lhermitte, Stef.(2023).Variable temperature thresholds of melt pond formation on Antarctic ice shelves.Nature Climate Change,13(2).
MLA	van Wessem, J. Melchior,et al."Variable temperature thresholds of melt pond formation on Antarctic ice shelves".Nature Climate Change 13.2(2023).