Climate Dynamics

, Volume 34, Issue 1, pp 1–26

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

  • Olivier Marti
  • P. Braconnot
  • J.-L. Dufresne
  • J. Bellier
  • R. Benshila
  • S. Bony
  • P. Brockmann
  • P. Cadule
  • A. Caubel
  • F. Codron
  • N. de Noblet
  • S. Denvil
  • L. Fairhead
  • T. Fichefet
  • M.-A. Foujols
  • P. Friedlingstein
  • H. Goosse
  • J.-Y. Grandpeix
  • E. Guilyardi
  • F. Hourdin
  • A. Idelkadi
  • M. Kageyama
  • G. Krinner
  • C. Lévy
  • G. Madec
  • J. Mignot
  • I. Musat
  • D. Swingedouw
  • C. Talandier
Article

DOI: 10.1007/s00382-009-0640-6

Cite this article as:
Marti, O., Braconnot, P., Dufresne, J. et al. Clim Dyn (2010) 34: 1. doi:10.1007/s00382-009-0640-6

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.

Keywords

ClimateSimulationsOceanAtmosphereCouplingCirculationEl Niño/Southern oscillationNorth-Atlantic oscillationStorm-tracksResolutionCoupling

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Olivier Marti
    • 1
  • P. Braconnot
    • 1
  • J.-L. Dufresne
    • 2
  • J. Bellier
    • 1
  • R. Benshila
    • 5
  • S. Bony
    • 2
  • P. Brockmann
    • 1
  • P. Cadule
    • 6
  • A. Caubel
    • 1
  • F. Codron
    • 2
  • N. de Noblet
    • 1
  • S. Denvil
    • 6
  • L. Fairhead
    • 2
  • T. Fichefet
    • 4
  • M.-A. Foujols
    • 6
  • P. Friedlingstein
    • 1
  • H. Goosse
    • 4
  • J.-Y. Grandpeix
    • 2
  • E. Guilyardi
    • 5
  • F. Hourdin
    • 2
  • A. Idelkadi
    • 1
  • M. Kageyama
    • 1
  • G. Krinner
    • 7
  • C. Lévy
    • 5
  • G. Madec
    • 5
  • J. Mignot
    • 5
  • I. Musat
    • 2
  • D. Swingedouw
    • 3
  • C. Talandier
    • 5
  1. 1.IPSL/LSCEunité mixte CEA-CNRS-UVSQGif-sur-Yvette CedexFrance
  2. 2.IPSL/LMDUnité mixte CNRS-Ecole Polytechnique-ENS-UPCMParis Cedex 05France
  3. 3.CNRS/CERFACSToulouseFrance
  4. 4.Institut d’Astronomie et de Géophysique Georges LemaîtreUniversité Catholique de LouvainLouvain-la-NeuveBelgium
  5. 5.IPLS/LOCEANunité mixte CNRS-IRD-UPMCParis Cedex 05France
  6. 6.Institut Pierre Simon Laplace des Sciences de l’Environnement (IPSL)Paris Cedex 05France
  7. 7.LGGEUnité mixte CNRS-UJF GrenobleSaint-Martin-d’HèresFrance