Evolution of a coupled marine ice sheet-sea level model

Natalya Gomez, David Pollard, Jerry X. Mitrovica, Peter Huybers, Peter U Clark

    Research output: Contribution to journalArticle

    30 Citations (Scopus)

    Abstract

    We investigate the stability of marine ice sheets by coupling a gravitationally self-consistent sea level model valid for a self-gravitating, viscoelastically deforming Earth to a 1-D marine ice sheet-shelf model. The evolution of the coupled model is explored for a suite of simulations in which we vary the bed slope and the forcing that initiates retreat. We find that the sea level fall at the grounding line associated with a retreating ice sheet acts to slow the retreat; in simulations with shallow reversed bed slopes and/or small external forcing, the drop in sea level can be sufficient to halt the retreat. The rate of sea level change at the grounding line has an elastic component due to ongoing changes in ice sheet geometry, and a viscous component due to past ice and ocean load changes. When the ice sheet model is forced from steady state, on short timescales (
    LanguageEnglish
    PagesF01013
    JournalJournal of Geophysical Research: Earth Surface
    Volume117
    DOIs
    Publication statusPublished - Feb 2012

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    ice sheet
    sea level
    grounding line
    sea level change
    simulation
    timescale
    ice
    geometry
    ocean

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    Gomez, Natalya ; Pollard, David ; Mitrovica, Jerry X. ; Huybers, Peter ; Clark, Peter U. / Evolution of a coupled marine ice sheet-sea level model. In: Journal of Geophysical Research: Earth Surface. 2012 ; Vol. 117. pp. F01013.
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    abstract = "We investigate the stability of marine ice sheets by coupling a gravitationally self-consistent sea level model valid for a self-gravitating, viscoelastically deforming Earth to a 1-D marine ice sheet-shelf model. The evolution of the coupled model is explored for a suite of simulations in which we vary the bed slope and the forcing that initiates retreat. We find that the sea level fall at the grounding line associated with a retreating ice sheet acts to slow the retreat; in simulations with shallow reversed bed slopes and/or small external forcing, the drop in sea level can be sufficient to halt the retreat. The rate of sea level change at the grounding line has an elastic component due to ongoing changes in ice sheet geometry, and a viscous component due to past ice and ocean load changes. When the ice sheet model is forced from steady state, on short timescales (",
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    Evolution of a coupled marine ice sheet-sea level model. / Gomez, Natalya; Pollard, David; Mitrovica, Jerry X.; Huybers, Peter; Clark, Peter U.

    In: Journal of Geophysical Research: Earth Surface, Vol. 117, 02.2012, p. F01013.

    Research output: Contribution to journalArticle

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    AU - Pollard, David

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    AU - Huybers, Peter

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