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| Titel |
Modelling the impact of submarine frontal melting and ice mélange on glacier dynamics |
| VerfasserIn |
J. Krug, G. Durand, O. Gagliardini, J. Weiss |
| 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 ; 9, no. 3 ; Nr. 9, no. 3 (2015-05-12), S.989-1003 |
| Datensatznummer |
250116797
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| Publikation (Nr.) |
 copernicus.org/tc-9-989-2015.pdf |
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| Zusammenfassung |
| Submarine melting of the calving face of tidewater glaciers and the
mechanical back force applied by the ice mélange layer are two mechanisms
generally proposed to explain seasonal variations at the calving front of
tidewater glaciers. However, the way these processes affect the calving rate
and glacier dynamics remains uncertain. In this study, we used a finite
element-based model that solves the full Stokes equations to simulate the
impact of these forcings on two-dimensional theoretical flow line glacier
configurations. The model, which includes calving processes, suggests that
frontal melting affects the position of the terminus only slightly (less than
a few hundred metres) and does not affect the multiannual glacier mass
balance at all. However, the ice mélange has a greater impact on the
advance and retreat cycles of the glacier front (more than several
kilometres) and its consequences for the mass balance are not completely
negligible, stressing the need for better characterization of forcing
properties. We also show that ice mélange forcing against the calving
face can mechanically prevent crevasse propagation at sea level and hence
prevent calving. Results also reveal different behaviours in grounded and
floating glaciers: in the case of a floating extension, the strongest
forcings can disrupt the glacier equilibrium by modifying its buttressing and
ice flux at the grounding line. |
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