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| Titel |
The Potsdam Parallel Ice Sheet Model (PISM-PIK) – Part 2: Dynamic equilibrium simulation of the Antarctic ice sheet |
| VerfasserIn |
M. A. Martin, R. Winkelmann, M. Haseloff, T. Albrecht, E. Bueler, C. Khroulev, A. Levermann |
| 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 ; 5, no. 3 ; Nr. 5, no. 3 (2011-09-14), S.727-740 |
| Datensatznummer |
250002601
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| Publikation (Nr.) |
 copernicus.org/tc-5-727-2011.pdf |
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| Zusammenfassung |
| We present a dynamic equilibrium simulation of the ice sheet-shelf system on
Antarctica with the Potsdam Parallel Ice Sheet Model (PISM-PIK). The
simulation is initialized with present-day conditions for bed topography and
ice thickness and then run to steady state with constant present-day surface
mass balance. Surface temperature and sub-shelf basal melt distribution are
parameterized. Grounding lines and calving fronts are free to evolve, and
their modeled equilibrium state is compared to observational data. A
physically-motivated calving law based on horizontal spreading rates allows
for realistic calving fronts for various types of shelves. Steady-state
dynamics including surface velocity and ice flux are analyzed for whole
Antarctica and the Ronne-Filchner and Ross ice shelf areas in particular. The
results show that the different flow regimes in sheet and shelves, and the
transition zone between them, are captured reasonably well, supporting the
approach of superposition of SIA and SSA for the representation of fast
motion of grounded ice. This approach also leads to a natural emergence of
sliding-dominated flow in stream-like features in this new 3-D marine
ice sheet model. |
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