globalchange  > 气候变化与战略
DOI: 10.1038/s41561-021-00754-9
论文题名:
Granular decoherence precedes ice mélange failure and glacier calving at Jakobshavn Isbræ
作者: Cassotto R.K.; Burton J.C.; Amundson J.M.; Fahnestock M.A.; Truffer M.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期:6
起始页码: 417
结束页码: 422
语种: 英语
英文关键词: Cordilleran Ice Sheet ; geophysical method ; ice sheet ; ice-ocean interaction ; melange ; thermodynamics ; Arctic ; Greenland
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169730
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Cassotto R.K.,Burton J.C.,Amundson J.M.,et al. Granular decoherence precedes ice mélange failure and glacier calving at Jakobshavn Isbræ[J]. Nature Geoscience,2021-01-01,14(6)
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