CAUSES AND FACTORS OF POSITIVE SURFACE OZONE ANOMALIES IN THE MOSCOW REGION AND ON THE SOUTHEASTERN COAST OF THE CRIMEA

Ozone sources and factors responsible for anomalous surface ozone concentrations are discussed. Foreign observations and measurements of surface ozone in Moscow, nearby suburbs, and on the territory far removed from the megalopolis, as well as on the coast of the Black Sea, are used as an example to illustrate the interrelations between elevated surface ozone concentrations, air temperature, and transport speed in the planetary boundary layer, and to show the dependence on advection of ozone and its precursors. Studies of factors responsible for ozone episodes and causes of decreased ozone concentrations under meteorological conditions favorable for photochemical ozone production are the basis for interpretation and correction of model ozone predictions.