Submitted as: model description paper 04 Oct 2021

Submitted as: model description paper | 04 Oct 2021

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

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 Pelletier1, Thierry Fichefet1, Hugues Goosse1, Konstanze Haubner2, Samuel Helsen3, Pierre-Vincent Huot1, Christoph Kittel4, François Klein1, Sebastien Le clec'h5, Nicole P. M. van Lipzig3, Sylvain Marchi3, François Massonnet1, Pierre Mathiot6,7, Ehsan Moravveji3,8, Eduardo Moreno-Chamarro9, Pablo Ortega9, Frank Pattyn2, Niels Souverijns3,10, Guillian Van Achter1, Sam Vanden Broucke3, Alexander Vanhulle5, Deborah Verfaillie1, and Lars Zipf2 Charles Pelletier et al.
  • 1Earth and Life Institute (ELI), UCLouvain, Louvain-la-Neuve, Belgium
  • 2Laboratoire de Glaciologie, Université Libre de Bruxelles, Brussels, Belgium
  • 3Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium
  • 4Laboratory of Climatology, Department of Geography, SPHERES, University of Liège, Liège, Belgium
  • 5Earth System Science and Departement Geografie, Vrije Universiteit Brussel, Brussels, Belgium
  • 6Met Office, Exeter, United Kingdom
  • 7Université Grenoble Alpes/CNRS/IRD/G-INP, IGE, Grenoble, France
  • 8ICTS, KU Leuven, Leuven, Belgium
  • 9Barcelona Supercomputing Center (BSC), Barcelona, Spain
  • 10Environmental Modelling Unit, Flemish Institute for Technological Research (VITO), Mol, Belgium

Abstract. 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 f.ETISh1.7 (ice sheet), NEMO3.6 (ocean), LIM3.6 (sea ice), COSMO5.0 (atmosphere) and CLM4.5 (land), which are here run at an 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 exchanges. 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 two-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.

Charles Pelletier et al.

Status: open (until 29 Nov 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Charles Pelletier et al.

Data sets

Scripts and data for the PARASO Geoscientific Model Development paper figures C. Pelletier

Input data for PARASO, a circum-Antarctic fully-coupled 5-component model C. Pelletier, F. Klein, L. ZIpf, S. Vanden Broucke, K. Haubner

PARASO ERA5 forcings C. Pelletier, S. Helsen

Model code and software

PARASO source code (no CCLM) C. Pelletier, F. Klein, L. Zipf, K. Haubner, F. Pattyn, E. Moravveji

Charles Pelletier et al.


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Short summary
We present PARASO, a circumpolar model for simulating the Antarctic climate. PARASO features five distinct models, each covering different Earth system subcomponents (ice sheet, atmosphere, land, sea ice, ocean). In this technical article, we describe how this tool has been developed, with a focus on the "coupling interfaces" representing the feedbacks between the distinct models put to contribution. PARASO is stable and ready-to-use, but is still characterized by significant biases.