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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Volume 5, issue 5
Geosci. Model Dev., 5, 1273-1295, 2012
https://doi.org/10.5194/gmd-5-1273-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Geosci. Model Dev., 5, 1273-1295, 2012
https://doi.org/10.5194/gmd-5-1273-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Model description paper 17 Oct 2012

Model description paper | 17 Oct 2012

Description of a hybrid ice sheet-shelf model, and application to Antarctica

D. Pollard1 and R. M. DeConto2 D. Pollard and R. M. DeConto
  • 1Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, USA
  • 2Department of Geosciences, University of Massachusetts, Amherst, MA, USA

Abstract. The formulation of a 3-D ice sheet-shelf model is described. The model is designed for long-term continental-scale applications, and has been used mostly in paleoclimatic studies. It uses a hybrid combination of the scaled shallow ice and shallow shelf approximations for ice flow. Floating ice shelves and grounding-line migration are included, with parameterized ice fluxes at grounding lines that allows relatively coarse resolutions to be used. All significant components and parameterizations of the model are described in some detail. Basic results for modern Antarctica are compared with observations, and simulations over the last 5 million years are compared with previously published results. The sensitivity of ice volumes during the last deglaciation to basal sliding coefficients is discussed.

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