The Potsdam Parallel Ice Sheet Model (PISM-PIK) – Part 1: Model description
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Open Access
- 14 September 2011
- journal article
- Published by Copernicus GmbH in The Cryosphere
- Vol. 5 (3), 715-726
- https://doi.org/10.5194/tc-5-715-2011
Abstract
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).Keywords
This publication has 51 references indexed in Scilit:
- Parameterization for subgrid-scale motion of ice-shelf calving frontsThe Cryosphere, 2011
- A variationally derived, depth-integrated approximation to a higher-order glaciological flow modelJournal of Glaciology, 2011
- Grounding line movement and ice shelf buttressing in marine ice sheetsJournal of Geophysical Research: Earth Surface, 2009
- Exact solutions to the thermomechanically coupled shallow-ice approximation: effective tools for verificationJournal of Glaciology, 2007
- Exact solutions and verification of numerical models for isothermal ice sheetsJournal of Glaciology, 2005
- Glacier Surge After Ice Shelf CollapseScience, 2003
- Application of a Polythermal Three-Dimensional Ice Sheet Model to the Greenland Ice Sheet: Response to Steady-State and Transient Climate ScenariosJournal of Climate, 1997
- Velocity and stress fields in grounded glaciers: a simple algorithm for including deviatoric stress gradientsJournal of Glaciology, 1995
- A 3-D model for the Antarctic ice sheet: a sensitivity study on the glacial-interglacial contrastClimate Dynamics, 1990
- On the dynamics of the ice sheets 2Published by American Geophysical Union (AGU) ,1983