The Cryosphere Discussions www.the-cryosphere-discuss.net 1994-0432 1994-0440 2 1 2008 10.5194/tcd-2-111-2008 http://www.the-cryosphere-discuss.net/2/111/2008/ http://www.the-cryosphere-discuss.net/2/111/2008/tcd-2-111-2008.html http://www.the-cryosphere-discuss.net/2/111/2008/tcd-2-111-2008.pdf 111 151 2008-02-19 Benchmark experiments for higher-order and full Stokes ice sheet models (ISMIP-HOM) F. Pattyn fpattyn@ulb.ac.be L. Perichon A. Aschwanden B. Breuer B. de Smedt O. Gagliardini G. H. Gudmundsson R. Hindmarsh A. Hubbard J. V. Johnson T. Kleiner Y. Konovalov C. Martin A. J. Payne D. Pollard S. Price M. Rückamp F. Saito O. Souček S. Sugiyama T. Zwinger Laboratoire de Glaciologie, Université Libre de Bruxelles, CP160/03, Av. F. Roosevelt 50, 1050 Brussels, Belgium Institute for Atmospheric and Climate Sciences, ETH Zurich, Universitaetstrasse 16, 8092 Zurich, Switzerland Institute for Geophysics, University of Muenster, Corrensstrasse 24, 48149 Muenster, Germany Vakgroep Geografie, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium Laboratoire de Glaciologie et de Géophysique de l'Environnement (LGGE), CNRS, UJF-Grenoble I, BP 96, 38402 Saint Martin d'Hères Cedex, France Physical Science Division, British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK Centre for Glaciology, Institute of Geography and Earth Sciences, Aberystwyth University, Ceredigion, SY23 3DP, UK Department of Computer Science, Social Science Building Room 417, University of Montana, Missoula MT, 59812-5256, USA Moscow Engineering Physics Institute, Moscow, Russia Bristol Glaciology Centre, School of Geographical Sciences, University Road, University of Bristol, Bristol BS8 1SS, UK Earth and Environmental Systems Institute, College of Earth and Mineral Sciences, 2217 Earth-Engineering Sciences Bldg., Pennsylvania State University, University Park, PA 16802, USA Frontier Research Center for Global Change, 3173-25 Showamachi, Kanazawa-ku, Yokohama City, Kanagawa 236-0001, Japan Department of Geophysics, Charles University Prague, V. Holešovičkách 2, 18000 Praha 8, Czech Republic Institute of Low Temperature Science, Hokkaido University, Nishi-8, Kita-19, Sapporo 060-0819 Japan CSC-Scientific Computing Ltd., Keilaranta 14, P.O. Box 405, 02101 Espoo, Finland We present the results of the first ice sheet model intercomparison project for higher-order and full Stokes ice sheet models. These models are validated in a series of six benchmark experiments of which one has an analytical solution under simplifying assumptions. Five of the tests are diagnostic and one experiment is prognostic or time dependent, for both 2-D and 3-D geometries. The results show a good convergence of the different models even for high aspect ratios. A clear distinction can be made between higher-order models and those that solve the full system of equations. The latter show a significantly better agreement with each other as well as with analytical solutions, which demonstrates that they are hardly influenced by the used numerics. 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