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Introduction

Classical Chemical-Transport Models (CTMs) usually use meteorological parameters (winds, temperature, …) from an external source (meteorological analyses, General Circulation Model (GCM) results) to compute chemistry and to transport chemical species, but they do not take into account the feedback processes of chemistry upon dynamics through radiative processes. This feedback can be taken into account by coupling the dynamical model to the chemical. We will present hereafter the results of such a coupling between the ARPEGE GCM and the REPROBUS CTM to illustrate its interest. As a new CTM -MOCAGE- is currently under development, with both stratospheric and tropospheric chemistries included whereas REPROBUS took only stratospheric chemistry into account, we will show the interest for climate studies to have a complete description of chemistry of the troposphere and stratosphere. Finally, we will give perspectives of such work.