Changes in biothermal conditions in the Sudetes Mountains and their foreland in relation to the circulation conditions

Progressing climate change is often reflected in changing biometeorological conditions. The Sudetes Mountains, located in the Polish-Czech border area, are concerned by this phenomenon. The goal of this paper is to evaluate the influence of atmospheric circulation on multiannual changes in biothermal conditions using the UTCI index. In the analysis, data for 1991-2020, from both Polish and Czech meteorological stations, was considered, while the circulation factor was evaluated using the Litynski classification. The research indicated a positive tendency of UTCI values for the majority of circulation types, which consequently contributed to a decrease in the frequency of cold stress categories. In the summits, a decline in the number of days with extreme cold stress was the most characteristic feature, especially under anticyclonic and northern circulation. Tendencies of heat stress occurrence were in most cases statistically insignificant, except for cyclonic and transitional circulation.

Automated summary

This paper studies the multiannual changes of biothermal conditions in the Sudetes Mountains and the influence of atmospheric circulation on them. It is found that the UTCI value shows a positive trend, the frequency of cold stress categories decreases, and the number of days with extreme cold stress at the summit decreases. The trend of heat stress occurrence is not significant except for cyclonic and transitional circulation.