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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

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 292283 [ download pdf ]

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Trefwoorden

Circulation Climate Coupling Resolution Marien/Kust

Author keywords

Simulations; Ocean; Atmosphere; El Niño/Southern oscillation; North-Atlantic oscillation; Storm-tracks

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Auteurs		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. 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.

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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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