Submitted as: model description paper 04 Jan 2022

Submitted as: model description paper | 04 Jan 2022

Review status: this preprint is currently under review for the journal GMD.

Benchmarking the vertically integrated ice-sheet model IMAU-ICE (version 2.0)

Constantijn J. Berends1, Heiko Goelzer2, Thomas J. Reerink3, Lennert B. Stap1, and Roderik S. W. van de Wal1,4 Constantijn J. Berends et al.
  • 1Institute for Marine and Atmospheric research Utrecht, Utrecht University, Utrecht, The Netherlands
  • 2NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway
  • 3Royal Netherlands Meteorological Institute KNMI, De Bilt, The Netherlands
  • 4Faculty of Geosciences, Department of Physical Geography, Utrecht University, Utrecht, The Netherlands

Abstract. Ice-dynamical processes constitute a large uncertainty in future projections of sea-level rise caused by anthropogenic climate change. Improving our understanding of these processes requires ice-sheet models that perform well at simulating both past and future ice-sheet evolution. Here, we present version 2.0 of the ice-sheet model IMAU-ICE, which uses the depth-integrated viscosity approximation (DIVA) to solve the stress balance. We evaluate its performance in a range of benchmark experiments, including simple analytical solutions, as well as both schematic and realistic model intercomparison exercises. IMAU-ICE has adopted recent developments in the numerical treatment of englacial stress and sub-shelf melt near the grounding-line, which result in good performance in experiments concerning grounding-line migration (MISMIP) and buttressing (ABUMIP). This makes it a model that is robust, versatile, and user-friendly, and which will provide a firm basis for (palaeo-)glaciological research in the coming years.

Constantijn J. Berends et al.

Status: open (until 03 Mar 2022)

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Constantijn J. Berends et al.

Constantijn J. Berends et al.


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Short summary
The rate at which marine ice sheets such as the West Antarctic will retreat in a warming climate and ocean is still uncertain. Numerical ice-sheet models, which solve the physical equations that describe the way glaciers and ice sheets deform and flow, have been substantially improved in recent years. Here we present the results of several years of work on IMAU-ICE, an ice-sheet model of intermediate complexity, that can be used to study ice sheets in both the past and the future.