SIMULATION OF WINTER CIRCULATION OF THE ATMOSPHERE OVER THE BAIKAL REGION

In order to assess the influence of sources of pollutants on the atmosphere of the Lake Baikal water area, the ICMMG SB RAS model is adapted to the geographical and climatic conditions of the Baikal region. Two scenario calculations describing the characteristic circulation of the winter atmosphere in conditions when Lake Baikal is covered with ice and those in the presence of an open water surface were performed. Some variants of passive impurity transfer from Irkutsk by the North-West wind flow simulated in these scenarios are discussed. With the same large-scale input data, the impurity concentrations reaching the lake's water area were lower in the scenario with frozen Lake Baikal surface. A preliminary comparison of the results of calculations has shown that the influence of differences in the thermal properties of the surface of Lake Baikal in these scenarios is manifested in the atmosphere of the surrounding territory at distances of the order of the width of the lake.