Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 7 4 2007 10.5194/acpd-7-11295-2007 http://www.atmos-chem-phys-discuss.net/7/11295/2007/ http://www.atmos-chem-phys-discuss.net/7/11295/2007/acpd-7-11295-2007.html http://www.atmos-chem-phys-discuss.net/7/11295/2007/acpd-7-11295-2007.pdf 11295 11398 2007-08-02 A new chemistry-climate tropospheric and stratospheric model MOCAGE-Climat: evaluation of the present-day climatology and sensitivity to surface processes H. Teyssèdre hubert.teyssedre@meteo.fr M. Michou H. L. Clark B. Josse F. Karcher D. Olivié V.-H. Peuch D. Saint-Martin D. Cariolle J.-L. Attié P. Ricaud R. J. van der A F. Chéroux GAME/CNRM (Météo-France, CNRS) Centre National de Recherches Météorologiques, Toulouse, France Centre Européen de Recherches et de Formation Avancée en Calcul Scientifique (CERFACS), Toulouse, France Laboratoire d'Aérologie (Université Toulouse III, CNRS), Toulouse, France KNMI (Royal Netherlands Meteorological Institute), De Bilt, The Netherlands We present the chemistry-climate configuration of the Météo-France Chemistry and Transport Model, MOCAGE-Climat. MOCAGE-Climat is a state-of-the-art model that simulates the global distribution of ozone and its precursors (82 chemical species) both in the troposphere and the stratosphere, up to the mid-mesosphere (~70 km). Surface processes (emissions, dry deposition), convection, and scavenging are explicitly described in the model that has been driven by the ECMWF operational analyses of the period 2000–2005, on T21 and T42 horizontal grids and 60 hybrid vertical levels, with and without a procedure that reduces calculations in the boundary layer, and with on-line or climatological deposition velocities. Model outputs have been compared to available observations, both from satellites (TOMS, HALOE, SMR, SCIAMACHY, MOPITT) and in-situ instrument measurements (ozone sondes, MOZAIC and aircraft campaigns) at climatological timescales. The distribution of long-lived species is in fair agreement with observations in the stratosphere putting apart shortcomings linked to the large-scale circulation. The variability of the ozone column, both spatially and temporarily, is satisfactory. 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