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    Complex fabric development revealed by englacial seismic reflectivity: Jakobshavn Isbræ, Greenland

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    Tsoflias_GRL_35(10)L10501.pdf (511.9Kb)
    Issue Date
    2008-05-21
    Author
    Horgan, H. J.
    Anandakrishnan, Sridhar
    Alley, Richard B.
    Peters, L. E.
    Tsoflias, Georgios P.
    Voigt, D. E.
    Winberry, J. P.
    Publisher
    American Geophysical Union
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    High-resolution reflection seismic data from Jakobshavn Isbræ, Greenland, reveal complex fabric development. Abundant englacial reflectivity occurs for approximately half the thickness of the ice (the lower half), and disruption of the englacial reflectors occurs in the lower 10–15% of the ice-thickness. These depths correspond to the higher impurity-content, and more easily deformed, ice from the Younger Dryas and Last Glacial Maximum to Stage-3. We conclude that the reflectivity results from contrasting seismic velocities due to changes in the crystal orientation fabric of the ice, and suggest that these fabric changes are caused by variations in impurity loading and subsequent deformation history. These findings emphasize the difference between ice-divide and ice-stream crystal orientation fabrics and have implications for predictive ice sheet modeling.
    Description
    This is the published version. Copyright 2008 American Geophysical Union. All Rights Reserved.
    URI
    http://hdl.handle.net/1808/17120
    DOI
    https://doi.org/10.1029/2008GL033712
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    • Geology Scholarly Works [245]
    Citation
    Horgan, H. J., S. Anandakrishnan, R. B. Alley, L. E. Peters, G. P. Tsoflias, D. E. Voigt, and J. P. Winberry (2008), Complex fabric development revealed by englacial seismic reflectivity: Jakobshavn Isbræ, Greenland, Geophys. Res. Lett., 35, L10501, http://dx.doi.org/10.1029/2008GL033712.

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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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