Regional tendencies in air temperature at the southwestern Pribaikalie

Abstract

The regional features of long-term changes in air temperature at the south-western Baikal region on the background of global climate changes were studied. To estimate changes in air temperature in the basins of the south-western Pribaikalie, the long-term series of air temperature were used for the Tunka weather station. The correlation coefficients between the series of air temperature at the Tunka weather station and the temperature averaged for the temperate latitudes, the Northern Hemisphere, and the Globe were analyzed. Analysis of the variations in the anomalies of the mean annual temperature averaged for different zones, have shown a pronounced increase in the growth rate of the annual air temperature since the beginning of the 1970s for all the series of data. To estimate the relationship between the change in the surface air temperature in south-western Pribaikalie and large-scale atmospheric circulation mechanisms, correlation coefficients between the series of temperature and the characteristics of the atmospheric circulation have been calculated. The results of the analysis showed that the closest relationship between air temperature in the basins of the south-western Pribaikalie exists with the Scandinavian index (SCAND), the western type of atmospheric circulation of Wangengeym-Girs (W) in winter, the pressure in the center of the Siberian High in December.