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| Titel |
The Potsdam Parallel Ice Sheet Model (PISM-PIK) – Part 1: Model description |
| VerfasserIn |
R. Winkelmann, M. A. Martin, 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.715-726 |
| Datensatznummer |
250002600
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| Publikation (Nr.) |
 copernicus.org/tc-5-715-2011.pdf |
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| Zusammenfassung |
| We present the Potsdam Parallel Ice Sheet Model (PISM-PIK), developed at the
Potsdam Institute for Climate Impact Research to be used for simulations of
large-scale ice sheet-shelf systems. It is derived from the Parallel Ice
Sheet Model (Bueler and Brown, 2009). Velocities are calculated by
superposition of two shallow stress balance approximations within the entire
ice covered region: the shallow ice approximation (SIA) is dominant in
grounded regions and accounts for shear deformation parallel to the geoid.
The plug-flow type shallow shelf approximation (SSA) dominates the velocity
field in ice shelf regions and serves as a basal sliding velocity in grounded
regions. Ice streams can be identified diagnostically as regions with a
significant contribution of membrane stresses to the local momentum balance.
All lateral boundaries in PISM-PIK are free to evolve, including the
grounding line and ice fronts. Ice shelf margins in particular are modeled
using Neumann boundary conditions for the SSA equations, reflecting a
hydrostatic stress imbalance along the vertical calving face. The ice front
position is modeled using a subgrid-scale representation of calving front
motion (Albrecht et al., 2011) and a physically-motivated calving law based
on horizontal spreading rates. The model is tested in experiments from the
Marine Ice Sheet Model Intercomparison Project (MISMIP). A dynamic
equilibrium simulation of Antarctica under present-day conditions is
presented in Martin et al. (2011). |
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