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    A mass-flux perspective of the tidewater glacier cycle

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    Author
    Amundson, Jason M.
    Keyword
    ice-ocean interactions
    iceberg
    calving
    tidewater glaciers
    Metadata
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    URI
    http://hdl.handle.net/11122/11191
    Abstract
    I explore the tidewater glacier cycle with a 1-D, depth- and width-integrated flow model that includes a mass-flux calving parameterization. The parameterization is developed from mass continuity arguments and relates the calving rate to the terminus velocity and the terminus balance velocity. The model demonstrates variable sensitivity to climate. From an advanced, stable configuration, a small warming of the climate triggers a rapid retreat that causes large-scale drawdown and is enhanced by positive glacier-dynamic feedbacks. Eventually, the terminus retreats out of deep water and the terminus velocity decreases, resulting in reduced drawdown and the potential for restabilization. Terminus readvance can be initiated by cooling the climate. Terminus advance into deep water is difficult to sustain, however, due to negative feedbacks between glacier dynamics and surface mass balance. Despite uncertainty in the precise form of the parameterization, the model provides a simple explanation of the tidewater glacier cycle and can be used to evaluate the response of tidewater glaciers to climate variability. It also highlights the importance of improving parameterizations of calving rates and of incorporating sediment dynamics into tidewater glacier models.
    Description
    I explore the tidewater glacier cycle with a 1-D, depth- and width-integrated flow model that includes a mass-flux calving parameterization. The parameterization is developed from mass continuity arguments and relates the calving rate to the terminus velocity and the terminus balance velocity.
    Date
    2016-04-06
    Publisher
    International Glaciological Society
    Type
    Article
    Peer-Reviewed
    Yes
    Citation
    Amundson, J. M. (2016), A mass-flux perspective of the tidewater glacier cycle, J. Glaciol., 62(231), 82–93, doi:10.1017/jog.2016.14.
    Collections
    Amundson, Jason M.

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