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Original Research Papers

Hadley circulation changes under global warming conditions indicated by coupled climate models

Authors:

Guillaume Gastineau ,

Laboratoire de Météorologie Dynamique, Université Pierre et Marie Curie-Paris6/CNRS, Paris, FR; Rosenstiel School for Marine and Atmospheric Science, University of Miami, Miami, FL, US
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Hervé Le Treut,

Laboratoire de Météorologie Dynamique, Université Pierre et Marie Curie-Paris6/CNRS, Paris, FR
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Laurent Li

Laboratoire de Météorologie Dynamique, Université Pierre et Marie Curie-Paris6/CNRS, Paris, FR
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Abstract

We use the mean meridional tropical circulation of the Atmospheric Ocean Coupled General Circulation Models (AOGCM) to diagnose and quantify the modifications of the mean meridional circulation of the atmosphere under global warming conditions. The AOGCMs generally show a weakening of the Hadley circulation for the winter cell in both hemispheres, accompanied by a poleward extension of the Hadley circulation area. The conditions explaining these modifications are analysed using detailed outputs from IPSL-CM4. The AOGCM IPSL-CM4 shows changes, under CO2 doubling, that are in accordance with the other models, for austral winter. On the other hand, for boreal winter, the winter cell shows little change in intensity and in extension. The poleward shift of the Southern Hemisphere winter Hadley cell corresponds to changes in the transient eddies, whereas the increase of the dry static stability is mainly responsible for the mean weakening of the cell. For boreal winter, a strong shrinking of the ascending branch area, and an increase of the latent heating, is found to cancel the weakening of the circulation due to dry static stability increase.

How to Cite: Gastineau, G., Le Treut, H. and Li, L., 2008. Hadley circulation changes under global warming conditions indicated by coupled climate models. Tellus A: Dynamic Meteorology and Oceanography, 60(5), pp.863–884. DOI: http://doi.org/10.1111/j.1600-0870.2008.00344.x
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  Published on 01 Jan 2008
 Accepted on 19 May 2008            Submitted on 11 Oct 2007

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