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    Dynamic jamming of iceberg-choked fjords

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    Name:
    Peters et al 2015 GRL - Jason ...
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    Author
    Peters, Ivo R.
    Amundson, Jason M.
    Cassotto, Ryan
    Fahnestock, Mark
    Darnell, Kristopher N.
    Truffer, Martin
    Zhang, Wendy W.
    Keyword
    iceberg-choked fjords
    jamming
    glaicers
    ice mélange
    terrestrial radar
    Jakobshavn Isbræ
    Greenland
    terminus
    local jamming
    Metadata
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    URI
    http://hdl.handle.net/11122/11186
    Abstract
    We investigate the dynamics of ice mélange by analyzing rapid motion recorded by a time-lapse camera and terrestrial radar during several calving events that occurred at Jakobshavn Isbræ, Greenland. During calving events (1) the kinetic energy of the ice mélange is 2 orders of magnitude smaller than the total energy released during the events, (2) a jamming front propagates through the ice mélange at a rate that is an order of magnitude faster than the motion of individual icebergs, (3) the ice mélange undergoes initial compaction followed by slow relaxation and extension, and (4) motion of the ice mélange gradually decays before coming to an abrupt halt. These observations indicate that the ice mélange experiences widespread jamming during calving events and is always close to being in a jammed state during periods of terminus quiescence. We therefore suspect that local jamming influences longer timescale ice mélange dynamics and stress transmission.
    Description
    We investigate the dynamics of ice mélange by analyzing rapid motion recorded by a time-lapse camera and terrestrial radar during several calving events that occurred at Jakobshavn Isbræ, Greenland.
    Date
    2015-02-02
    Source
    Research Letter
    Publisher
    American Geophysical Union
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Peters, I. R., J. M. Amundson, R. Cassotto, M. Fahnestock, K. N. Darnell, M. Truffer, and W. W. Zhang (2015), Dynamic jamming of iceberg-choked fjords, Geophys. Res. Lett., 42, doi:10.1002/2014GL062715
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    Amundson, Jason M.

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