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Between times (t) and (t + 6h), the ARPEGE GCM computes winds and temperature that are sent to the REPROBUS CTM and used to compute chemistry and to advect the chemical tracers between time (t) and (t + 6h). This is the classical CTM approach (off-line mode) that just takes into account the effect of dynamics upon chemistry. The principle of the coupling is that the ozone three-dimensional field obtained at time (t + 6h) by the REPROBUS CTM is then sent back to the ARPEGE GCM. Thus, ARPEGE will compute new winds and temperature between times (t + 6h) and (t + 12h) initialized by the 3D ozone field from REPROBUS at time (t + 6h). This approach (on-line mode) allows feedback of chemistry upon dynamics throught radiative processes.