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Key features of the IPSL ocean atmosphere model and its sensitivity to atmospheric resolution

Olivier Marti 1, 2 Pascale Braconnot 1, 2 Jean-Louis Dufresne 3 Jacques Bellier 1 Rachid Benshila 4 Sandrine Bony 3 Patrick Brockmann 1, 5 Patricia Cadule 6 Arnaud Caubel 1, 5 Francis Codron 3 Nathalie de Noblet 1, 7 Sébastien Denvil 6 Laurent Fairhead 3 Thierry Fichefet 8 Marie-Alice Foujols 6 Pierre Friedlingstein 1 Hugues Goosse 8 Jean-Yves Grandpeix 3 Éric Guilyardi 4 Frédéric Hourdin 3 Abderrahmane Idelkadi 1 Masa Kageyama 1, 9 Gerhard Krinner 10 Claire Lévy 4 Gurvan Madec 4 Juliette Mignot 4 Ionela Musat 3 Didier Swingedouw 11 Claude Talandier 4
2 MERMAID - Modelling the Earth Response to Multiple Anthropogenic Interactions and Dynamics
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
5 CALCULS - Calcul Scientifique
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
7 ESTIMR - Extrèmes : Statistiques, Impacts et Régionalisation
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
9 CLIM - Modélisation du climat
LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] : DRF/LSCE
10 CLIPS
LGGE - Laboratoire de glaciologie et géophysique de l'environnement
Abstract : This paper presents the major characteristics of the Institut Pierre Simon Laplace (IPSL) coupled ocean-atmosphere general circulation model. The model components and the coupling methodology are described, as well as the main characteristics of the climatology and interannual variability. The model results of the standard version used for IPCC climate projections, and for intercomparison projects like the Paleoclimate Modeling Intercomparison Project (PMIP 2) are compared to those with a higher resolution in the atmosphere. A focus on the North Atlantic and on the tropics is used to address the impact of the atmosphere resolution on processes and feedbacks. In the North Atlantic, the resolution change leads to an improved representation of the storm-tracks and the North Atlantic oscillation. The better representation of the wind structure increases the northward salt transports, the deep-water formation and the Atlantic meridional overturning circulation. In the tropics, the ocean-atmosphere dynamical coupling, or Bjerknes feedback, improves with the resolution. The amplitude of ENSO (El Niño-Southern oscillation) consequently increases, as the damping processes are left unchanged.
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https://hal-insu.archives-ouvertes.fr/insu-00498320
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Submitted on : Wednesday, July 7, 2010 - 11:20:18 AM
Last modification on : Wednesday, October 14, 2020 - 4:09:45 AM

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Olivier Marti, Pascale Braconnot, Jean-Louis Dufresne, Jacques Bellier, Rachid Benshila, et al.. Key features of the IPSL ocean atmosphere model and its sensitivity to atmospheric resolution. Climate Dynamics, Springer Verlag, 2010, 34 (1), pp.1-26. ⟨10.1007/s00382-009-0640-6⟩. ⟨insu-00498320⟩

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