A new climatology of stratospheric BrO profiles has been developed, with the aim to apply it to the retrieval of tropospheric BrO columns from space nadir measurements. The impact of the atmospheric dynamic on the stratospheric BrO distribution is treated by means of Bry/ozone correlations build from 3D-CTM model results, while photochemical effects are taken into account using stratospheric NO2 columns as an indicator of the BrO/Br y ratio. The suitability of the adopted parameterization is evaluated based on one year of output data from the 3D CTM BASCOE. Model simulations include full gas phase chemistry and relevant heterogeneous reactions, while dynamics is driven by ECMWF wind fields.