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The Cryosphere An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/tc-2019-326
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-2019-326
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 20 Jan 2020

Submitted as: research article | 20 Jan 2020

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A revised version of this preprint was accepted for the journal TC.

Results of the third Marine Ice Sheet Model Intercomparison Project (MISMIP+)

Stephen L. Cornford1, Helene Seroussi2, Xylar S. Asay-Davis3, G. Hilmar Gudmundsson4, Rob Arthern5, Chris Borstad6, Julia Christmann7, Thiago Dias dos Santos8,9, Johannes Feldmann10, Daniel Goldberg11, Matthew J. Hoffman3, Angelika Humbert7,12, Thomas Kleiner7, Gunter Leguy13, William H. Lipscomb13, Nacho Merino14, Gaël Durand14, Mathieu Morlighem8, David Polllard15, Martin Rückamp7, C. Rosie Williams4, and Hongju Yu8 Stephen L. Cornford et al.
  • 1Centre for Polar Observation and Modelling, Department of Geography, Swansea University, Swansea, UK
  • 2Jet Propulsion Laboratory, California Institute of Technology, Pasadena CA, USA
  • 3Los Alamos National Laboratory, Los Alamos NM, USA
  • 4Faculty of Engineering and Environment, Northumbria University, Newcastle, UK
  • 5British Antarctic Survey, Cambridge, UK
  • 6Department of Civil Engineering, Montana State University, Bozeman MT, USA
  • 7Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
  • 8Department of Earth System Science, University of California, Irvine CA, USA
  • 9Centro Polar e Climático, Universidade Federal do Rio Grande do Sul, Porto Alegre RS, Brazil
  • 10Potsdam Institute for Climate Impact Research, Potsdam, Germany
  • 11Institute of Geography, University of Edinburgh, Edinburgh, UK
  • 12University of Bremen, Bremen, Germany
  • 13Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder CO, USA
  • 14Université Grenoble Alpes, CNRS, IRD, IGE, Grenoble, France
  • 15Earth and Environmental Systems Institute, Pennsylvania State University, USA

Abstract. We present the result of the third Marine Ice Sheet Intercomparison project, MISMIP+. MISMIP+ is intended to be a test of ice flow models which include fast sliding marine ice streams and floating ice shelves and in particular a treatment of viscous stress that is sufficient for buttressing, where upstream ice flow is restrained by a downstream ice shelf. A set of idealized experiments test the models in circumstances where buttressing contributes to a stable steady state, and where a reduction in that buttressing causes ice stream acceleration, thinning, and grounding line retreat. We find that the most important distinction between models in this particular type of simulation is in the treatment of sliding at the bed, with other distinctions – notably the difference between the simpler and more complete treatments of englacial stress, but also the differences between numerical methods – taking a secondary role.

Stephen L. Cornford et al.

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Stephen L. Cornford et al.

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Supplementary data for 'Results of the third Marine Ice Sheet Model Intercomparison Project (MISMIP+)' S. L. Cornford https://doi.org/10.5281/zenodo.3611936

Stephen L. Cornford et al.

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Latest update: 27 May 2020
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Short summary
We present the results of the third Marine Ice Sheet Intercomparison Project (MISMIP+). MISMIP+ is one in a series of exercises that test numerical models of ice sheet flow in simple situations. This particular exercise concentrates on the response of ice sheet models to the thinning of their floating ice shelves, which is of interest because numerical models are currently used to model the response to contemporary and near future thinning in Antarctic ice shelves.
We present the results of the third Marine Ice Sheet Intercomparison Project (MISMIP+). MISMIP+...
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