A 3-DIMENSIONAL MODEL STUDY OF NITROGEN-OXIDES IN THE STRATOSPHERE

A new three-dimensional model for stratospheric chemistry studies is d escribed. The model, a spectral general circulation model, is develope d from the model used at the European Centre for Medium-range Weather Forecasts. Schemes to describe atmospheric chemistry and photochemistr y as well as advection of trace gases have been implemented, In this s tudy a perturbed period in January 1987 is studied. The model performs well. An interesting feature, similar to the Noxon cliff, is reproduc ed in which the NO2 column is reduced significantly in high latitudes. In this calculation the cliff is produced by gas phase conversion of NO2 to N2O5.