NUMERICAL STUDY OF POLLUTANT TRANSPORT IN THE ATMOSPHERE OF THE SOUTHERN BAIKAL REGION
Some results of the numerical study of atmospheric dynamics and passive pollutant transport in the Southern Baikal area are presented in the article. These calculations are a part of the research to study the features of a mesoclimate formation and to assess the air quality of the Baikal region.The study of the pollutant transport from a point source in the city of Shelekhov is based on the scenario approach. Two numerical experiments for the meteorological conditions in July are considered: in one of them the temperature stratification for lower layers of background atmosphere is steady, in the other stratification is neutral. These scenarios are based on observations of sulfur dioxide concentrations over the Irkutsk Reservoir and the waters of Lake Baikal during on July 22th 2013.The calculations of the daily behavior of meteorological parameters and pollutant concentrations were obtained with the nonhydrostatic mesoscale model of atmospheric dynamics and a model of passive pollutant transport in areas with complex terrain. The models are adjusted to the orographic and climatic features of the territory study. The preprocessing of the input information about the underlying surface, visualization and spatial analysis of the scenario experiment results are carried out in the ArcGIS environment using GIS tools and a special technique developed by the authors. Qualitative agreement of the modeling results and the available observational data has shown that the model of atmospheric dynamics and the model of passive pollutant transport are perspective for further research of features of an atmospheric circulation formation and an air quality in the region