Spatial and Temporal Structure of Over Humidificationin the South-East of the Western Siberiain the XX-th and Beginning of the XXI Centuries

Abstract

The purpose of the study is to study the spatial-temporal structure of excessive moisture in the South-East of the Western Siberia. Methods and materials. This paper is based on calculation and analysis of the atmospheric humidity index (Si) for 9 weather stations in the South-East of the Western Siberia for the period from 1950 to 2017, the spatial and temporal structure of over humidification was studied: -2,0< Si < -1,1 – weak waterlogging; -3,0< Si <-2,1 – medium waterlogging, Si < -3,1 – strong waterlogging. In this paper, a regression analysis is performed between over humidification and previous conditions of heat and moisture supply in the current and previous years. Analysis of linear trends allowed us to determine the General trend of the Si index for May to September. Results and discussion. Normal hydration is observed in 50 % of cases. The forming of “wet periods” of different intensity is possible in any month, and can lasts from May to September. A slight over humidification (-2,0 < Si < -1,1) had been noted in the South East of Western Siberia. At the same time excess moisture is on average approximately two stations. The frequency of wet periods in the XXI century decreased by 2-3 times. Conclusion. The author analyzes a difference between over humidification and the heat and moisture during the current and previous years. The closest points between forming of over humidification were obtained: in August according to a precipitation deficit (< 80 % out of the norm); in September – in the West of the region, and in November – in the South East. During the period of 1950-2017, in August in the southern and South-Eastern regions, a tendency to reduce the frequency of excessive humidification of various degrees of intensity was revealed, which indicates an increase in the aridity of the territory during the warm period.