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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 02 May 2018

Model description paper | 02 May 2018

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Geoscientific Model Development (GMD).

The GRISLI ice sheet model (version 2.0): calibration and validation for multi-millennial changes of the Antarctic ice sheet

Aurélien Quiquet1, Christophe Dumas1, Catherine Ritz2, Vincent Peyaud2, and Didier M. Roche1,3 Aurélien Quiquet et al.
  • 1Laboratoire des Sciences du Climat et de l’Environnement (LSCE), UMR8212, CEA/CNRS-INSU/UVSQ, Gif-sur-Yvette Cedex, France
  • 2Université Grenoble Alpes, CNRS, IRD, IGE, 38000 Grenoble, France
  • 3Earth and Climate Cluster, Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands

Abstract. In this paper we present the GRISLI (Grenoble Ice Sheet and Land Ice) model in its newest revision (version 2.0). Whilst GRISLI is applicable to any given geometry, we focus here on the Antarctic ice sheet because it highlights the importance of grounding line dynamics. Important improvements have been implemented since its original version (Ritz et al., 2001) including notably an explicit flux computation at the grounding line based on the analytical formulations of Schoof (2007) and Tsai et al. (2015) and a basal hydrology model. A calibration of the mechanical parameters of the model based on an ensemble of 150 members sampled with a Latin Hypercube method is used. The ensemble members performance is assessed relative to the deviation from present-day observed Antarctic ice thickness. The model being designed for multi-millenial long- term integrations, we also present glacial-interglacial ice sheet changes throughout the last 400kyr using the best ensemble members. To achieve this goal, we construct a simple climatic perturbation of present-day climate forcing fields based on two climate proxies, both atmospheric and oceanic. The model is able to reproduce expected grounding line advances during glacials and subsequent retreats during terminations with reasonable glacial-interglacial ice volume changes.

Aurélien Quiquet et al.
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Aurélien Quiquet et al.
Aurélien Quiquet et al.
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Latest update: 17 Oct 2018
Publications Copernicus
Short summary
This paper presents the GRISLI (Grenoble Ice Sheet and Land Ice) model in its newest revision. We present the recent model improvements from its original version (Ritz et al., 2001) together with a discussion of the model performance in reproducing the present-day Antarctic ice sheet geometry and the grounding line advances and retreats during the last 400 000 years. We show that GRISLI is a computationally cheap model, able to reproduce the large scale behaviour of ice sheets.
This paper presents the GRISLI (Grenoble Ice Sheet and Land Ice) model in its newest revision....