气候变化领域集成服务门户(CCPortal): Granular decoherence precedes ice mélange failure and glacier calving at Jakobshavn Isbræ

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DOI	10.1038/s41561-021-00754-9
	Granular decoherence precedes ice mélange failure and glacier calving at Jakobshavn Isbræ
	Cassotto R.K.; Burton J.C.; Amundson J.M.; Fahnestock M.A.; Truffer M.
发表日期	2021
ISSN	17520894
起始页码	417
结束页码	422
卷号	14 期号:6
英文摘要	The stability of the world’s largest glaciers and ice sheets depends on mechanical and thermodynamic processes occurring at the glacier–ocean boundary. A buoyant agglomeration of icebergs and sea ice, referred to as ice mélange, often forms along this boundary and has been postulated to affect ice-sheet mass losses by inhibiting iceberg calving. Here, we use terrestrial radar data sampled every 3 min to show that calving events at Jakobshavn Isbræ, Greenland, are preceded by a loss of flow coherence in the proglacial ice mélange by up to an hour, wherein individual icebergs flowing in unison undergo random displacements. A particle dynamics model indicates that these fluctuations are likely due to buckling and rearrangements of the quasi-two-dimensional material. Our results directly implicate ice mélange as a mechanical inhibitor of iceberg calving and further demonstrate the potential for real-time detection of failure in other geophysical granular materials. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	Cordilleran Ice Sheet; geophysical method; ice sheet; ice-ocean interaction; melange; thermodynamics; Arctic; Greenland
语种	英语
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/206874
作者单位	Earth Science and Observation Center, Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Physics, Emory University, Atlanta, GA, United States; Department of Natural Sciences, University of Alaska Southeast, Juneau, AK, United States; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States
推荐引用方式 GB/T 7714	Cassotto R.K.,Burton J.C.,Amundson J.M.,et al. Granular decoherence precedes ice mélange failure and glacier calving at Jakobshavn Isbræ[J],2021,14(6).
APA	Cassotto R.K.,Burton J.C.,Amundson J.M.,Fahnestock M.A.,&Truffer M..(2021).Granular decoherence precedes ice mélange failure and glacier calving at Jakobshavn Isbræ.Nature Geoscience,14(6).
MLA	Cassotto R.K.,et al."Granular decoherence precedes ice mélange failure and glacier calving at Jakobshavn Isbræ".Nature Geoscience 14.6(2021).