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| Titel |
Parameterization of grounding-line cliff failure in an Antarctic ice sheet model |
| VerfasserIn |
David Pollard, Robert DeConto |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250092837
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| Publikation (Nr.) |
 EGU/EGU2014-7201.pdf |
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| Zusammenfassung |
| Two mechanisms have recently been added to a 3-D ice-sheet model that
can produce drastic retreat into East Antarctic sub-glacial basins during
past warm periods, as implied by (albeit uncertain) geologic evidence.
The two mechanisms, (1) structural failure of large tidewater cliffs,
and (2) enhanced ice-shelf calving due to meltwater draining into crevasses,
present challenges in their parameterization within coarse-grid models.
Here we describe details and choices in the parameterization of structural
failure at deep grounding lines, its incorporation into the large-scale
dynamical equations, and the sensitivity of model results to these choices.
In addition, a parameterization of melt-enhanced calving is described,
along with a simple representation of the clogging effects of ice melange
in narrow seaways, and their effects on Antarctic simulations. |
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