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| Titel |
Parameterization of basal friction near grounding lines in a one-dimensional ice sheet model |
| VerfasserIn |
G. R. Leguy, X. S. Asay-Davis, W. H. Lipscomb |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 8, no. 4 ; Nr. 8, no. 4 (2014-07-18), S.1239-1259 |
| Datensatznummer |
250116245
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| Publikation (Nr.) |
 copernicus.org/tc-8-1239-2014.pdf |
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| Zusammenfassung |
| Ice sheets and ice shelves are linked by the transition zone, the region
where flow dominated by vertical shear stress makes a transition to flow
dominated by extensional stress. Adequate resolution of the transition zone
is necessary for numerically accurate ice sheet–ice shelf simulations. The
required resolution depends on how the basal physics is parameterized. We
propose a~new, simple parameterization of the effective pressure near the
grounding line, combined with an existing friction law linking effective
pressure to basal stress and sliding, in a one-dimensional, fixed-grid,
vertically integrated model. This parameterization represents connectivity
between the basal hydrological system and the ocean in the transition zone.
Our model produces a smooth transition between finite basal friction in the
ice sheet and zero basal friction in the ice shelf. In a set of experiments
based on the Marine Ice Sheet Model Intercomparison Project (MISMIP), we show
that with a smoother basal shear stress, the model yields accurate
steady-state results at a fixed-grid resolution of ~1 km. |
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