The calculations of the anomaly criteria for average annual values of air temperature at the Earth's surface in the European, Siberian and Far Eastern sectors for the period 1948-2018 have been performed according to NCEP / NCAR Reanalysis. Changes in the criteria for temperature anomalies near the Earth's surface and at altitudes of isobaric surfaces of 850 hPa (lower troposphere), 500 hPa (middle troposphere) and 300 hPa (upper troposphere) are analyzed. The results indicate an increase in the degree of temperature variability in the period 2007-2018 and increasing the area of the territory with an anomalous distribution of average temperatures. Also, good agreement was found on changes in temperature anomalies in the regions.
The paper is devoted to large-scale and zonal atmospheric factors of climate variability over the territory of the Baikal region. This territory is considered to be one of the regions with highest rates of climate change according to Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet). The investigation was made of high- and low-frequency components in multidecadal timescales of climatic indices dynamics on the basis of trend, correlation, and spectrum analyses. The climatic indices determine and distinguish variability in pressure fields and geopotential at high latitudes in the Northern hemisphere, in the northern parts of the Atlantic and Pacific oceans throughout the time period of 1950–2017. Particular emphasis was put on searching for causes of increasingly arid climate in the Baikal region in summer months of 2000–2017, when the number of forest fires in the region rose dramatically. Winds having a southerly component at the height of middle troposphere were identified as the contributing factor for enhancing heat advection.