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

• Published in: Geoscientific Model Development
• Main Authors: Pelletier, Charles, Fichefet, Thierry, Goosse, Hugues, Haubner, Konstanze, Helsen, Samuel, Huot, Pierre-Vincent, Kittel, Christoph, Klein, François, Moreno Chamarro, Eduardo, Ortega Montilla, Pablo
• Other Authors: Universitat Politècnica de Catalunya. Departament de Física, Barcelona Supercomputing Center
• Format: Article in Journal/Newspaper
• Language: English
• Published: European Geosciences Union (EGU) 2022
• Subjects: Àrees temàtiques de la UPC::Física; Àrees temàtiques de la UPC::Informàtica::Aplicacions de la informàtica; Climatology > Mathematical models; Climate modeling; Ice sheet; Ice shelf; Ice-ocean interaction; Polar region; Sea ice; Climatologia > Models matemàtics; Antarctic; Southern Ocean; The Antarctic; Antarc*; Ice Sheet; Ice Shelf
• Online Access: http://hdl.handle.net/2117/363385; https://doi.org/10.5194/gmd-15-553-2022

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. This research has been supported by the Fonds De La Recherche Scientifique – FNRS (grant no. O0100718F). Peer Reviewed Article signat per 23 autors/es: Charles Pelletier (1), Thierry Fichefet (1), Hugues Goosse (1), Konstanze Haubner (2), Samuel Helsen (3), Pierre-Vincent Huot (1), Christoph Kittel (4), François Klein (1), Sébastien Le clec'h (5), Nicole P. M. van Lipzig (3), Sylvain ...