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    Sudden increase in tidal response linked to calving and acceleration at a large Greenland outlet glacier

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    StearnsL_GRL_37(12)L12501.pdf (588.0Kb)
    Issue Date
    2010-06-23
    Author
    de Juan, Julia
    Elosegui, Pedro
    Nettles, Meredith
    Larsen, Tine B.
    Davis, James L.
    Hamilton, Gordon S.
    Stearns, Leigh A.
    Andersen, Morten L.
    Ekstrom, Göran
    Ahlstrøm, Andreas P.
    Stenseng, Lars
    Khan, S. Aabbas
    Forsberg, René
    Publisher
    American Geophysical Union
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    [1] Large calving events at Greenland's largest outlet glaciers are associated with glacial earthquakes and near-instantaneous increases in glacier flow speed. At some glaciers and ice streams, flow is also modulated in a regular way by ocean tidal forcing at the terminus. At Helheim Glacier, analysis of geodetic data shows decimeter-level periodic position variations in response to tidal forcing. However, we also observe transient increases of more than 100% in the glacier's responsiveness to such tidal forcing following glacial-earthquake calving events. The timing and amplitude of the changes correlate strongly with the step-like increases in glacier speed and longitudinal strain rate associated with glacial earthquakes. The enhanced response to the ocean tides may be explained by a temporary disruption of the subglacial drainage system and a concomitant reduction of the friction at the ice-bedrock interface, and suggests a new means by which geodetic data may be used to infer glacier properties.
    Description
    This is the publisher's version, also available electronically from "http://onlinelibrary.wiley.com/".
    URI
    http://hdl.handle.net/1808/17233
    DOI
    https://doi.org/10.1029/2010GL043289
    ISSN
    0094-8276
    Collections
    • Geology Scholarly Works [247]
    Citation
    de Juan, J., et al. (2010), Sudden increase in tidal response linked to calving and acceleration at a large Greenland outlet glacier, Geophys. Res. Lett., 37, L12501, http://www.dx.doi.org/10.1029/2010GL043289

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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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