Spatio-temporal changes in energetic characteristics of eddy atmospheric circulation in the troposphere of West Siberia in the end of XX – the beginning of XXI centuries

Abstract

In the framework of the study based on ERA-Interim reanalysis dataset the analysis of average values of available potential energy, kinetic energy, their eddy components and parameter of relative vorticity, characterizing cyclonic and anticyclonic types of circulation, was carried out over the period of 1979-2015 for the territory of West Siberia. Also coefficients of their linear trends were calculated. It was revealed that the distribution in positive and negative tendencies of energetic characteristics was significantly changed upon transition from the period of 1979-1998 to the period of 1999-2015 along with considerable increase in their trend values. Their trend areas with negative values were located close to each other and were slightly covered in zone 60°-64°N. The greatest dissipation intensity was observed in the middle troposphere. At the earth’s surface eddy circulation generation along the Arctic coast was shifted to East Siberia. The beginning of XXI century was characterized by the significant decrease in eddy circulation activity over West Siberia that was especially pronounced in winter. Furthermore, eddy circulation (cyclonic type) increased just in the certain zones - in the interfluve area of the Ob and the Irtysh rivers. This indicates the possibility of anomalies in meteorological parameters formation there.