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| Titel |
Are seasonal calving dynamics forced by buttressing from ice mélange or undercutting by melting? Outcomes from full-Stokes simulations of Store Glacier, West Greenland |
| VerfasserIn |
J. Todd, P. Christoffersen |
| 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. 6 ; Nr. 8, no. 6 (2014-12-16), S.2353-2365 |
| Datensatznummer |
250116393
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| Publikation (Nr.) |
 copernicus.org/tc-8-2353-2014.pdf |
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| Zusammenfassung |
| We use a full-Stokes 2-D model (Elmer/Ice) to investigate the flow and
calving dynamics of Store Glacier, a fast-flowing outlet glacier in West
Greenland. Based on a new, subgrid-scale implementation of the crevasse depth
calving criterion, we perform two sets of simulations: one to identify the
primary forcing mechanisms and another to constrain future stability. We find
that the mixture of icebergs and sea ice, known as ice mélange or
sikussak, is principally responsible for the observed seasonal advance of the
ice front. On the other hand, the effect of submarine melting on the calving
rate of Store Glacier appears to be limited. Sensitivity analysis
demonstrates that the glacier's calving dynamics are sensitive to seasonal
perturbation, but are stable on interannual timescales due to the strong
topographic control on the flow regime. Our results shed light on the
dynamics of calving glaciers and may help explain why neighbouring glaciers
do not necessarily respond synchronously to changes in atmospheric and
oceanic forcing. |
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