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    Granular decoherence precedes ice mélange failure and glacier calving at Jakobshavn Isbræ

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    Author
    Cassotto, Ryan
    Burton, Justin C.
    Amundson, Jason M.
    Fahnestock, Mark
    Truffer, Martin
    Keyword
    Glaciers
    Jakobshavn Isbræ
    Iceberg calving
    Ice mélange
    Geophysical granular materials
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    URI
    http://hdl.handle.net/11122/12864
    Abstract
    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.
    Date
    2021-05-27
    Publisher
    Springer Nature
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Cassotto R, Burton JC, Amundson JM, Fahnestock MA and Truffer M (2021) Granular decoherence precedes ice mélange failure and glacier calving at Jakobshavn Isbræ. Nature Geoscience 14(6), 417–422. doi: 10.1038/ s41561-021-00754-9
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    Amundson, Jason M.

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