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    A unifying framework for iceberg-calving models

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    Name:
    Amundson and Truffer 2010 JGlac ...
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    Author
    Amundson, Jason M.
    Truffer, Martin
    Keyword
    glaciers
    iceberg calving
    icebergs
    calving
    calving framework
    terminus velocity
    glacier flow
    terminus thickness
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/11045
    Abstract
    We propose a general framework for iceberg-calving models that can be applied to any calving margin. The framework is based on mass continuity, the assumption that calving rate and terminus velocity are not independent and the simple idea that terminus thickness following a calving event is larger than terminus thickness at the event onset. The theoretical, near steady-state analysis used to support and analyze the framework indicates that calving rate is governed, to first order, by ice thickness, thickness gradient, strain rate, mass-balance rate and backwards melting of the terminus; the analysis furthermore provides a physical explanation for a previously derived empirical relationship for ice-shelf calving (Alley and others, 2008). In the calving framework the pre- and post-calving terminus thicknesses are given by two unknown but related functions. The functions can vary independently of changes in glacier flow and geometry, and can therefore account for variations in calving behavior due to external forcings and/or self-sustaining calving processes (positive feedbacks). Although the calving framework does not constitute a complete calving model, any thickness-based calving criterion can easily be incorporated into the framework. The framework should be viewed as a guide for future attempts to parameterize calving.
    Description
    We propose a general framework for iceberg-calving models that can be applied to any calving margin.
    Date
    2010-07-09
    Publisher
    International Glaciological Society
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Amundson, J. M. and Truffer, M.: A unifying framework for iceberg-calving models, J. Glaciol., 56, 822–830, doi:10.3189/002214310794457173, 2010.
    Collections
    Amundson, Jason M.

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