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    Non-linear glacier response to calving events, Jakobshavn Isbræ, Greenland

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    Name:
    Cassotto et al 2019 JGlac - Jason ...
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    Author
    Cassoto, Ryan
    Fahnestock, Mark
    Amundson, Jason M.
    Truffer, Martin
    Boettcher, Margaret S.
    De La Pena, Santiago
    Howat, Ian
    Keyword
    calving
    dynamic thinning
    terrestrial radar interferometry
    Jakobshavn Isbræ
    tidewater glaciers
    Metadata
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    URI
    http://hdl.handle.net/11122/11200
    Abstract
    Jakobshavn Isbræ, a tidewater glacier that produces some of Greenland’s largest icebergs and highest speeds, reached record-high flow rates in 2012 (Joughin and others, 2014). We use terrestrial radar interferometric observations from August 2012 to characterize the events that led to record-high flow. We find that the highest speeds occurred in response to a small calving retreat, while several larger calving events produced negligible changes in glacier speed. This non-linear response to calving events suggests the terminus was close to flotation and therefore highly sensitive to terminus position. Our observations indicate that a glacier’s response to calving is a consequence of two competing feedbacks: (1) an increase in strain rates that leads to dynamic thinning and faster flow, thereby promoting desta- bilization, and (2) an increase in flow rates that advects thick ice toward the terminus and promotes restabilization. The competition between these feedbacks depends on temporal and spatial variations in the glacier’s proximity to flotation. This study highlights the importance of dynamic thinning and advective processes on tidewater glacier stability, and further suggests the latter may be limiting the current retreat due to the thick ice that occupies Jakobshavn Isbræ’s retrograde bed.
    Description
    Jakobshavn Isbræ, a tidewater glacier that produces some of Greenland’s largest icebergs and highest speeds, reached record-high flow rates in 2012 (Joughin and others, 2014). We use terrestrial radar interferometric observations from August 2012 to characterize the events that led to record-high flow.
    Date
    2018-11-29
    Publisher
    International Glaciological Society
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Cassotto, R., Fahnestock, M., Amundson, J. M., Truffer, M. & Joughin, I. Seasonal and interannual variations in ice melange and its impact on terminus stability, Jakobshavn Isbræ, Greenland. J. Glaciol. 61, 76–88 (2015).
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    Amundson, Jason M.

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