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Introduction

Regional climate model RegCM2 is used for study of climate change impact on regional scales. The simple ozone profile parameterization based on standard atmosphere composition neglecting the monthly and regional variability is prescribed in standard version of the model. Sensitivity tests for appropriate ozone changes both in troposphere and stratosphere with respect to possible antropogeneous changes are presented resulting in quite significant changes in radiative characteristics of the model. The great effect is usually connected with other parameters and variables of the model with important role of water vapour and cloudness. For the purposes of this study the model top was moved up to 10 hPa and the resolution was increased in stratosphere. For the tests of validity of the model in real climate simulation modification of the model introducing TOMS data is presented. Real TOMS data can be used recovering the ozone profile by means of the analytical curve. Its parameters can be analysed on ozone profiles data and also their climatology, ie. at least their monthly and latitudinal variability is available for real extrapolation. The comparison of such an inclusion of ozone profile into the RegCM2 based on TOMS climatology with the appropriate ozone profile based on day to day and point to point variable real ozone information from TOMS data is presented as well. It can be seen that the effect of the improvement of ozone profile incorporation into the model can be at least in some of model points quite significant mainly for radiative characteristics. Actually, for climate models without the chemistry of ozone we could hardly have proper detailed ozone data for long term simulations, but it should be possible to include into such models better parameterization of both seasonal and at least latitudinal ozone profile variability.