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    Basal melt rates beneath Whillans Ice Stream, West Antarctica

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    VanderveenC_JG_56(198)647.pdf (371.9Kb)
    Issue Date
    2010-08-05
    Author
    Beem, Lucas H.
    Jezek, Kenneth C.
    van der Veen, Cornelis J.
    Publisher
    International Glaciological Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    Basal water lubricates and enables the fast flow of the West Antarctic ice streams which exist under low gravitational driving stress. Identification of sources and rates of basal meltwater production can provide insight into the dynamics of ice streams and the subglacial hydrology, which remain insufficiently described by glaciological theory. Combining measurements and analytic modeling, we identify two regions where basal meltwater is produced beneath Whillans Ice Stream, West Antarctica. Downstream of the onset of shear crevasses, strong basal melt (20–50 mm a−1) is concentrated beneath the relatively narrow shear margins. Farther upstream, melt rates are consistently 3–7 mm a−1 across the width of the ice stream. We show that the transition in melt-rate patterns is coincident with the onset of shear margin crevassing and streaming flow and related to the development of significant lateral shear resistance, which reorganizes the resistive stress regime and induces a concentration of basal resistance adjacent to the shear margin. Finally, we discuss how downstream freeze-on in the ice-stream center coupled with melt beneath the shear margin might result in a slowing but widening ice stream.
    Description
    This is the published version, also available here: http://dx.doi.org/10.3189/002214310793146241.
    URI
    http://hdl.handle.net/1808/17293
    DOI
    https://doi.org/10.3189/002214310793146241
    Collections
    • Geography & Atmospheric Science Scholarly Works [168]
    • Environmental Studies Scholarly Works [56]
    Citation
    Beem, Lucas H., Jezek, Ken C., Van Der Veen, C. J. "Basal melt rates beneath Whillans Ice Stream, West Antarctica." (2010) Journal of Glaciology. 56, 198. pp 647. http://dx.doi.org/10.3189/002214310793146241.

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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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