Key features of the IPSL ocean atmosphere model and its sensitivity to atmospheric resolution - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Climate Dynamics Year : 2010

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

Olivier Marti
Pascale Braconnot
Jean-Louis Dufresne
Jacques Bellier
  • Function : Author
Rachid Benshila
Sandrine Bony
Patrick Brockmann
Patricia Cadule
Arnaud Caubel
  • Function : Author
Francis Codron
Nathalie de Noblet
  • Function : Author
Sébastien Denvil
  • Function : Author
Laurent Fairhead
  • Function : Author
Thierry Fichefet
  • Function : Author
Marie-Alice Foujols
Pierre Friedlingstein
Hugues Goosse
Jean-Yves Grandpeix
  • Function : Author
Éric Guilyardi
Frédéric Hourdin
Abderrahmane Idelkadi
  • Function : Author
Masa Kageyama
Gerhard Krinner
Claire Lévy
  • Function : Author
Gurvan Madec
Juliette Mignot
Ionela Musat
  • Function : Author
Didier Swingedouw
Claude Talandier
  • Function : Author

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.

Dates and versions

insu-00498320 , version 1 (07-07-2010)

Identifiers

Cite

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, 2010, 34 (1), pp.1-26. ⟨10.1007/s00382-009-0640-6⟩. ⟨insu-00498320⟩
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