SIMULATION OF THE GLOBAL TOTAL OZONE INTERANNUAL VARIATIONS IN 1993—2000 AND THE EFFECT OF OZONE-DEPLETING SUBSTANCE PRODUCTION LIMITATIONS

T. A. Egorova, E. V. Rozanov, I. L. Karol, V. A. Zubov, and S. L. Malyshev

The estimates of influence of chlorofluorocarbon (CFC) production limitations in accordance with the Montreal Protocol and its Amendments (MPA) and of interannual variations of the atmospheric circulation on atmospheric ozone are dealt with. The results are obtained with a three-dimensional atmospheric chemical transport model using the UKMO assimilated winds and temperature in the 1990s. Significant influence of the atmospheric circulation on the total ozone in the Northern Hemisphere is investigated. The estimates show that the MPA has saved up to 2% of the present-day total ozone in the Northern Hemisphere and up to 5% in the Southern Hemisphere by 2000. The calculations also show that CFCs do not play a major role in the observed total ozone variations.