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    Time-dependent basal stress conditions beneath Black Rapids Glacier, Alaska, USA, inferred from measurements of ice deformation and surface motion

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    Amundson et al 2006 JGlac - Jason ...
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    Author
    Amundson, Jason M.
    Truffer, Martin
    Luthi, Martin P.
    Keyword
    surface motion
    basal stress
    ice deformation
    measurements of ice deformation
    basal shear
    stress distribution
    glacier
    motion
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/11039
    Abstract
    Observations of surface motion and ice deformation from 2002–03 were used to infer mean stress fields in a cross-section of Black Rapids Glacier, Alaska, USA, over seasonal timescales. Basal shear stresses in a well-defined zone north of the center line (orographic left) were approximately 7% and 16% lower in spring and summer, respectively, than in winter. Correspondingly higher stresses were found near the margins. These changes in the basal shear stress distribution were sufficiently large to cause mean surface velocities to be 1.2 and 1.5 times larger in spring and summer than in winter. These results were inferred with a simple inverse finite-element flow model that can successfully reproduce bulk surface velocities and tiltmeter data. Stress redistribution between the well-defined zone and the margins may also occur over much shorter time periods as a result of rapidly changing basal conditions (ice–bed decoupling or enhanced till deformation), thereby causing large variations in surface velocity and strongly influencing the glacier’s net motion during summer.
    Description
    Observations of surface motion and ice deformation from 2002–03 were used to infer mean stress fields in a cross-section of Black Rapids Glacier, Alaska, USA, over seasonal timescales
    Date
    2006-06-23
    Publisher
    International Glaciological Society
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Amundson, J. M., M. Truffer, M. P. Lu, and C. Zu (2006), Time-dependent basal stress conditions beneath Black Rapids Glacier, Alaska, USA, inferred from measurements of ice deformation and surface motion, J. Glaciol., 52(178), 347–357
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    Amundson, Jason M.

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