Influence of ozone mini-holes over Russian territories in May 2021 and March 2022 revealed in satellite observations and simulation
P.N. Vargin1,2, B.A. Fomin1, V.A. Semenov2
1Central Aerological Observatory, Dolgoprudnyiy, Russia
2A.M. Obukhov Institute of Atmospheric Physics Russian Academy of Sciences, Moscow, Russia
Keywords: ozone mini-holes, UV radiation, anticyclones, troposphere
Abstract
The mechanisms of the formation of ozone mini-holes (OMHs) and their influence on the levels of UV radiation (UVR) over May 22-24, 2021, in the middle and southern parts of the Volga region and the south of the Urals and Western Siberia and over March 16-18, 2022, in the northwest of the European of Russia are studied using data from the AIRS satellite infrared spectrometer and NCEP reanalysis. It is shown that the formation of these OMHs is due to the increase in the tropopause level associated with the anticyclone and the transfer of low-ozone air masses from the subtropics. In the first period of the OMH, negative total ozone (TO) anomalies were up to ~ 20% of the average values from 2003 to 2021, and positive UVR anomalies attained 40-60%, the UV index increased from ~ 6 to ~ 8. In the second period, in the region of the OMH with negative TO anomalies up to ~ -40%, positive UVR anomalies attained 40-60%, and the UV index increased from ~ 1 to ~ 2. Calculations with an original spectral model, which allows solving the transport equation at a single point, confirmed the increase in UVR revealed in satellite observations in the OMH regions.
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