globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1715136115
论文题名:
Quantifying flow and stress in ice mélange; the world’s largest granular material
作者: Burton J.C.; Amundson J.M.; Cassotto R.; Kuo C.-C.; Dennin M.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:20
起始页码: 5105
结束页码: 5110
语种: 英语
英文关键词: Calving ; Glacier ; Granular ; Jamming ; Mélange
Scopus关键词: ice ; Article ; environmental parameters ; flow kinetics ; force ; glacier ; iceberg ; mathematical computing ; mathematical model ; measurement ; physical parameters ; priority journal ; shear stress ; water flow
英文摘要: Tidewater glacier fjords are often filled with a collection of calved icebergs, brash ice, and sea ice. For glaciers with high calving rates, this “mélange” of ice can be jam-packed, so that the flow of ice fragments is mostly determined by granular interactions. In the jammed state, ice mélange has been hypothesized to influence iceberg calving and capsize, dispersion and attenuation of ocean waves, injection of freshwater into fjords, and fjord circulation. However, detailed measurements of ice mélange are lacking due to difficulties in instrumenting remote, ice-choked fjords. Here we characterize the flow and associated stress in ice mélange, using a combination of terrestrial radar data, laboratory experiments, and numerical simulations. We find that, during periods of terminus quiescence, ice mélange experiences laminar flow over timescales of hours to days. The uniform flow fields are bounded by shear margins along fjord walls where force chains between granular icebergs terminate. In addition, the average force per unit width that is transmitted to the glacier terminus, which can exceed 107 N/m, increases exponentially with the mélange length-to-width ratio. These “buttressing” forces are sufficiently high to inhibit the initiation of large-scale calving events, supporting the notion that ice mélange can be viewed as a weak granular ice shelf that transmits stresses from fjord walls back to glacier termini. © 2018 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162298
Appears in Collections:气候变化与战略

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作者单位: Burton, J.C., Department of Physics, Emory University, Atlanta, GA 30322, United States; Amundson, J.M., Department of Natural Sciences, University of Alaska Southeast, Juneau, AK 99801, United States; Cassotto, R., Department of Earth Sciences, University of New Hampshire, Durham, NH 03824, United States; Kuo, C.-C., Department of Physics and Astronomy, University of California, Irvine, CA 92697, United States; Dennin, M., Department of Physics and Astronomy, University of California, Irvine, CA 92697, United States

Recommended Citation:
Burton J.C.,Amundson J.M.,Cassotto R.,et al. Quantifying flow and stress in ice mélange; the world’s largest granular material[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(20)
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