Abstract
A two‐dimensional model has been used to study the possible effects of heterogeneous chemistry on the ozone concentration in the northern high latitudes. The model uses a diabatic circulation which is consistent with the calculated ozone. The temperature field is prescribed in such a way to realistically reproduce the thermal conditions in the polar lower stratosphere during the winter season. A complete chemical code is included that produces a realistic nitric acid concentration and then the formation of polar stratospheric clouds of nitric acid tri‐hydrate particles. NOx and ClOx families are explicitly predicted as a function of time‐dependent N2O, CH4 and CFC mixing ratios from the simulated year 1960 until 2000. The increase of the total chlorine amount in the stratosphere is shown to be a possible explanation for the observed trend of ozone depletion in the high‐latitude northern region. The presence of polar stratospheric clouds is found to be important for the seasonal behavior of the ozone secular trend.
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