REGIONAL PECULIARITIES OF SUMMER TEMPERATURE CHANGE IN WESTERN SIBERIA IN THE SECOND HALF OF 20th – EARLY 21st CENTURIES

Abstract

In the paper the spatial and temporal changes of summer temperatures in Western Siberia during the period of 1951–2012 were investigated using observations data on weather stations. It was shown that the spatially inhomogeneous summer warming was observed in the study region. Warming rates declined at the end of 20th – beginning of 21st centuries. The uncertainty associates with a possible change of direction of change in summer temperatures and the formation of a stable trend of warming slowdown. It was revealed that despite the slowdown in warming, the northwestern part of the Altai krai is the most vulnerable area of increased risk of hazardous hydrometeorological events associated with the long periods of abnormally hot weather in summer. Variations of atmospheric circulation indices associated with the weakening/strengthening of zonal transport significantly contribute to the fluctuations in summer temperatures in the north of Western Siberia. The main surface temperature anomalies in summer in the south of Western Siberia are linked to the Eastern Atlantic-Western Russia (EAWR) pattern and Scandinavia pattern. The negative phase of the EAWR and Scand indices reflects major blocking anticyclones and above-average temperatures in Western Siberia.