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    Seasonal and interannual variations in ice melange and its impact on terminus stability, Jakobshavn Isbræ, Greenland

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    Name:
    Cassotto et al 2015 JGlac - Jason ...
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    Author
    Cassotto, Ryan
    Fahnestock, Mark
    Amundson, Jason M.
    Truffer, Martin
    Joughin, Ian
    Keyword
    arctic glaciology
    calving
    ice/ocean interactions
    remote sensing
    sea-ice dynamics
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/11187
    Abstract
    We used satellite-derived surface temperatures and time-lapse photography to infer temporal variations in the proglacial ice melange at Jakobshavn Isbræ, a large and rapidly retreating outlet glacier in Greenland. Freezing of the melange-covered fjord surface during winter is indicated by a decrease in fjord surface temperatures and is associated with (1) a decrease in ice melange mobility and (2) a drastic reduction in iceberg production. Vigorous calving resumes in spring, typically abruptly, following the steady up-fjord retreat of the sea-ice/ice-melange margin. An analysis of pixel displacement from time-lapse imagery demonstrates that melange motion increases prior to calving and subsequently decreases following several events. We find that secular changes in ice melange extent, character and persistence can influence iceberg calving, and therefore glacier dynamics over daily-to-monthly timescales, which, if sustained, will influence the mass balance of an ice sheet.
    Description
    We used satellite-derived surface temperatures and time-lapse photography to infer temporal variations in the proglacial ice melange at Jakobshavn Isbræ, a large and rapidly retreating outlet glacier in Greenland.
    Date
    2014-09-29
    Publisher
    International Glaciological Society
    Peer-Reviewed
    Yes
    Citation
    Cassotto, R., M. Fahnestock, J. M. Amundson, M. Truffer, and I. Joughin (2015), Seasonal and interannual variations in ice melange and its impact on terminus stability, Jakobshavn Isbræ, Greenland, J. Glaciol., 61(225), 76– 88, doi:10.3189/2015JoG13J235.
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    Amundson, Jason M.

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