Atmos. Chem. Phys. Discuss., 5, 12373-12401, 2005
www.atmos-chem-phys-discuss.net/5/12373/2005/
doi:10.5194/acpd-5-12373-2005
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
On the ability of chemical transport models to simulate the vertical structure of the N2O, NO2 and HNO3 species in the mid-latitude stratosphere
G. Berthet1,2, N. Huret2, F. Lefèvre1, G. Moreau2, C. Robert2, M. Chartier2, L. Pomathiod2, M. Pirre2, and V. Catoire2
1Service d’Aéronomie, Institut Pierre-Simon Laplace, F-75252 Paris, France
2Laboratoire de Physique et Chimie de l’Environnement, F-45071 Orléans, France

Abstract. In this paper we study the impact of the modelling of N2O on the simulation of NO2 and HNO3 by comparing in situ vertical profiles measured at mid-latitudes with the results of the Reprobus 3-D CTM (Three-dimensional Chemical Transport Model) computed with the kinetic parameters from the JPL recommendation in 2002. The analysis of the measured in situ profile of N2O shows particular features indicating different air mass origins. The measured N2O, NO2 and HNO3 profiles are not satisfyingly reproduced by the CTM when computed using the current 6-hourly ECMWF operational analysis. Improving the simulation of N2O transport allows us to calculate quantities of NO2 and HNO3 in reasonable agreement with observations. This is achieved using 3-hourly winds obtained from ECMWF forecasts. The best agreement is obtained by constraining a one-dimensional version of the model with the observed N2O. This study shows that modelling the NOy partitioning with better accuracy relies at least on a correct simulation of N2O and thus of total NOy.

Citation: Berthet, G., Huret, N., Lefèvre, F., Moreau, G., Robert, C., Chartier, M., Pomathiod, L., Pirre, M., and Catoire, V.: On the ability of chemical transport models to simulate the vertical structure of the N2O, NO2 and HNO3 species in the mid-latitude stratosphere, Atmos. Chem. Phys. Discuss., 5, 12373-12401, doi:10.5194/acpd-5-12373-2005, 2005.
 
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