PARASO, a circum-Antarctic fully coupled ice-sheet-ocean-sea-ice-atmosphere-land model involving f.ETISh1.7, NEMO3.6, LIM3.6, COSMO5.0 and CLM4.5

Charles Pelletier , Thierry Fichefet , Hugues Goosse , Konstanze Haubner , Samuel Helsen , Pierre-Vincent Huot , Christoph Kittel , François Klein , Sébastien Le Clec'H , Nicole P. M. van Lipzig , Sylvain Marchi , François Massonnet , Pierre Mathiot (1) , Ehsan Moravveji , Eduardo Moreno-Chamarro , Pablo Ortega , Frank Pattyn , Niels Souverijns , Guillian van Achter , Sam Vanden Broucke , Alexander Vanhulle , Deborah Verfaillie (2) , Lars Zipf

1 IGE - Institut des Géosciences de l’Environnement
2 ELIE - Earth and Life Institute - Environmental Sciences

We introduce PARASO, a novel five-component fully coupled regional climate model over an Antarctic circumpolar domain covering the full Southern Ocean. The state-of-the-art models used are the fast Elementary Thermomechanical Ice Sheet model (f.ETISh) v1.7 (ice sheet), the Nucleus for European Modelling of the Ocean (NEMO) v3.6 (ocean), the Louvain-la-Neuve sea-ice model (LIM) v3.6 (sea ice), the COnsortium for Small-scale MOdeling (COSMO) model v5.0 (atmosphere) and its CLimate Mode (CLM) v4.5 (land), which are here run at a horizontal resolution close to 1/4^∘. One key feature of this tool resides in a novel two-way coupling interface for representing ocean-ice-sheet interactions, through explicitly resolved ice-shelf cavities. The impact of atmospheric processes on the Antarctic ice sheet is also conveyed through computed COSMO-CLM-f.ETISh surface mass exchange. In this technical paper, we briefly introduce each model's configuration and document the developments that were carried out in order to establish PARASO. The new offline-based NEMO-f.ETISh coupling interface is thoroughly described. Our developments also include a new surface tiling approach to combine open-ocean and sea-ice-covered cells within COSMO, which was required to make this model relevant in the context of coupled simulations in polar regions. We present results from a 2000-2001 coupled 2-year experiment. PARASO is numerically stable and fully operational. The 2-year simulation conducted without fine tuning of the model reproduced the main expected features, although remaining systematic biases provide perspectives for further adjustment and development.

Domaines: Planète et Univers [physics]; Sciences de la Terre

Charles Pelletier, Thierry Fichefet, Hugues Goosse, Konstanze Haubner, Samuel Helsen, et al.. PARASO, a circum-Antarctic fully coupled ice-sheet-ocean-sea-ice-atmosphere-land model involving f.ETISh1.7, NEMO3.6, LIM3.6, COSMO5.0 and CLM4.5. Geoscientific Model Development, 2022, 15, pp.553-594. ⟨10.5194/gmd-15-553-2022⟩. ⟨insu-03706399⟩