Western Siberia

Introduction. The work is devoted to the analysis of the influence of different states of the circumpolar vortex on local features of the geopotential fields, which, in turn, determine the variability of cold season precipitation for the studied territory of Western Siberia. Data and Methods. A statistical analysis of time series of seasonally average values of the precipitation amount in the cold season was performed, obtained from 33 meteorological stations located within the selected coordinate area.

The article represents lithogeochemical characteristics of rocks of sortymsky suite. It is revealed that the rocks belong to sellitem and the hydrolysates, the values of Sodium Module and Potassium Module indicates on sediments of greywacke containing hydromica, chlorite, plagioclase. Degree the maturity received by a thin pool alumosilicates was moderate (CIA < 70). Sortymsky the basin was characterized by shallow depth with an increase in salinity of the East to the West.

The article presents the results of work on the study of synoptic conditions for the formation of a dangerous weather phenomenon for the territory of Western Siberia – a thundersnow. The material for the study was the archive of aerosynoptic material from the Khanty-Mansiysk Air Meteorological Center.

The article presents the study results of thunderstorm activity with rainfall over a large territory of Western Siberia in its three regions: Northern, Central and Southern over a seven-year period from 2017 to 2023. The study revealed the most favorable synoptic conditions for the formation of thunderstorm activity with heavy rainfall over a large area of Western Siberia. Cases are also reviewed and factors that need to be paid attention to when forecasting thunderstorms with squally winds are identified.

The article presents the study results of the annual variability of thunderstorm activity at nine climatic stations in Western Siberia over a fifty-year period from 1971 to 2020. The study revealed a complex quasi-periodic structure of thunderstorm activity series with the most pronounced amplitude of 7–8-year cycles for the forest-tundra and a 2–4-year cycle for the taiga zone, as well as forest-steppes.

Quantitative assessment of the territory continentality is an urgent task, because in the conditions of climate change, the index of continentality can be taken into account when developing geographical forecasts of landscape development. The purpose of this study is to assess the change in the index of continentality of Western Siberia in the conditions of the current trend in climate development. The statistical series of observations on seven meteorological stations in Western Siberia served as the information base of the study.