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    Quantitative estimates of velocity sensitivity to surface melt variations at a large Greenland outlet glacier

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    StearnsL_JoG_57(204)609.pdf (796.7Kb)
    Issue Date
    2011-09-01
    Author
    Andersen, Morten L.
    Nettles, Meredith
    Larsen, Tine B.
    Hamilton, Gordon S.
    Stearns, Leigh A.
    Elosegui, Pedro
    Publisher
    International Glaciological Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    The flow speed of Greenland outlet glaciers is governed by several factors, the relative importance of which is poorly understood. The delivery of surface-generated meltwater to the bed of alpine glaciers has been shown to influence glacier flow speed when the volume of water is sufficient to increase basal fluid pressure and hence basal lubrication. While this effect has also been demonstrated on the Greenland ice-sheet margin, little is known about the influence of surface melting on the large, marine-terminating outlet glaciers that drain the ice sheet. We use a validated model of meltwater input and GPS-derived surface velocities to quantify the sensitivity of glacier flow speed to changes in surface melt at Helheim Glacier during two summer seasons (2007–08). Our observations span ∼55 days near the middle of each melt season. We find that relative changes in glacier speed due to meltwater input are small, with variations of ∼45% in melt producing changes in velocity of ∼2–4%. These velocity variations are, however, of similar absolute magnitude to those observed at smaller glaciers and on the ice-sheet margin. We find that the glacier's sensitivity to variations in meltwater input decreases approximately exponentially with distance from the calving front. Sensitivity to melt varies with time, but generally increases as the melt season progresses. We interpret the time-varying sensitivity of glacier flow to meltwater input as resulting from changes in subglacial hydraulic routing caused by the changing volume of meltwater input.
    Description
    This is the publisher's version, also available electronically from "http://www.ingentaconnect.com".
    URI
    http://hdl.handle.net/1808/17238
    DOI
    https://doi.org/10.3189/002214311797409785
    ISSN
    0022-1430
    Collections
    • Geology Scholarly Works [247]
    Citation
    Andersen, M., Nettles, M., Elosegui, P., Larsen, T., Hamilton, G., & Stearns, L. (2011). Quantitative estimates of velocity sensitivity to surface melt variations at a large Greenland outlet glacier. Journal of Glaciology, 57(204), 609-620, http://dx.doi.org/10.3189/002214311797409785

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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