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Key features of the IPSL ocean atmosphere model and its sensitivity to atmospheric resolution
Marti, O.; Braconnot, P.; Dufresne, J.-L.; Bellier, J.; Benshila, R.; Bony, S.; Brockmann, P.; Cadule, P.; Caubel, A.; Codron, F.; de Noblet, N.; Denvil, S.; Fairhead, L.; Fichefet, T.; Foujols, M.-A.; Friedlingstein, P.; Goosse, H.; Grandpeix, J.-Y.; Guilyardi, E.; Hourdin, F.; Idelkadi, A.; Kageyama, M.; Krinner, G.; Lévy, C.; Madec, G.; Mignot, J.; Musat, I.; Swingedouw, D.; Talandier, C. (2010). Key features of the IPSL ocean atmosphere model and its sensitivity to atmospheric resolution. Clim. Dyn. 34(1): 1-26. http://dx.doi.org/10.1007/s00382-009-0640-6
In: Climate Dynamics. Springer: Berlin; Heidelberg. ISSN 0930-7575; e-ISSN 1432-0894, more
Peer reviewed article  
Available in  Authors 
Keywords
    Circulation
    Climate
    Coupling
    Resolution
    Marine/Coastal
Author keywords
    Simulations; Ocean; Atmosphere; El Niño/Southern oscillation; North-Atlantic oscillation; Storm-tracks
Authors  Top 
  • Marti, O.
  • Braconnot, P.
  • Dufresne, J.-L.
  • Bellier, J.
  • Benshila, R.
  • Bony, S.
  • Brockmann, P.
  • Cadule, P.
  • Caubel, A.
  • Codron, F.
  • de Noblet, N.
  • Denvil, S.
  • Fairhead, L.
  • Fichefet, T., more
  • Foujols, M.-A.
  • Friedlingstein, P.
  • Goosse, H., more
  • Grandpeix, J.-Y.
  • Guilyardi, E.
  • Hourdin, F.
  • Idelkadi, A.
  • Kageyama, M.
  • Krinner, G.
  • Lévy, C.
  • Madec, G.
  • Mignot, J.
  • Musat, I.
  • Swingedouw, D., more
  • Talandier, C.
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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