Abstract
The climate change in the Selenga River basin observed over the period from 1961 to 2018 is considered. The WorldClim dataset and the GHCN-Daily global weather station database are used to map mean and extreme climatic characteristics. These maps are included in the geoinformation system for hydroecological safety in the Selenga River basin under development. An interpolation technique that takes into account the dependence of temperature and precipitation extremes on their average long-term values is used for mapping extreme indices. It was found that in contrast to most of Russia, average annual temperature in the Selenga River basin increases mainly due to the warm season. At the same time, the amount of precipitation decreases, which leads to the increasing risk of droughts. A substantial increase in the number of days with maximum temperature ≥25 °C, the number of consecutive dry days, as well as the frequency of droughts, is revealed. It is most pronounced in the south of the basin.
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