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| Titel |
Thermal structure and basal sliding parametrisation at Pine Island Glacier – a 3-D full-Stokes model study |
| VerfasserIn |
N. Wilkens, J. Behrens, T. Kleiner, D. Rippin, M. Rückamp, A. Humbert |
| 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. 2 ; Nr. 9, no. 2 (2015-04-13), S.675-690 |
| Datensatznummer |
250116777
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| Publikation (Nr.) |
 copernicus.org/tc-9-675-2015.pdf |
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| Zusammenfassung |
| Pine Island Glacier is one of the fastest changing glaciers of the Antarctic
Ice Sheet and therefore of scientific interest. The glacier holds enough ice to
raise the global sea level significantly (~ 0.5 m) when fully melted.
The question addressed by numerous modelling studies of the glacier focuses
on whether the observed changes are a start of an uncontrolled and
accelerating retreat. The movement of the glacier is, in the fast-flowing
areas, dominated by basal motion. In modelling studies the parametrisation of
the basal motion is therefore crucial. Inversion methods are commonly applied
to reproduce the complex surface flow structure of Pine Island Glacier by
using information of the observed surface velocity field to constrain, among
other things, basal sliding. We introduce two different approaches of
combining a physical parameter, the basal roughness, with basal sliding
parametrisations. This way basal sliding is again connected closer to its
original formulation. We show that the basal roughness is an important and
helpful parameter to consider and that many features of the flow structure
can be reproduced with these approaches. |
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