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The ARPEGE atmospheric GCM is a spectral global model that includes 41 layers from the surface up to 80 km of altitude. It has an Eulerian transport scheme and uses the Foucart-Morcrette radiation scheme. REPROBUS is a CTM that describes stratospheric chemistry with 55 chemical species and more than 100 chemical reactions. Heterogeneous chemistry upon Polar Stratospheric Clouds and aerosol particles is parameterised within the model. Transport of the chemical species are assured by a semi-Lagrangian scheme. More details about this CTM can be found in Lefèvre et al., J. Geophys. Res. [1994].