Cold spells in the city of Poznań and their circulation conditions (original) (raw)
2024, Theoretical and applied climatology
Wolock (2010) an increase in mean winter Norther Hemisphere temperature is associated with a substantial decrease in snow cover extent since about 1970.Similar directions of change were also indicated in numerous studies from the territory of Poland (Kejna and Rudzki 2021; Marosz et al. 2023). As pointed out in studies based on long measurement series, a clear increase in the rate of air temperature rise has been noted since the end of the 1980s (Migała et al. 2016; Kolendowicz et al. 2019; Pospieszyńska and Przybylak 2019). The most intense warming was recorded in winter and spring (or spring and winter) (Kolendowicz et al. 2019; Pospieszyńska and Przybylak 2019). Similar results were obtained by Ustrnul et al. (2021) analysing changes in thermal conditions in Poland between 1951 and 2018. As demonstrated by Kejna and Rudzki (2021), the increase in the average annual air temperature in Poland between 1961 and 2018 was 0.3 °C/10 years. The most significant changes were recorded on the Silesian, Wielkopolska, and Mazovian lowlands, and in the central part of the Baltic coast. The results presented above were obtained based on research conducted using synoptic stations located in the outskirts of cities. Such a location does not fully reflect the conditions prevailing in the urban area, which are varied and are the result of specific physical properties of materials covering the ground in the city, absorbing more solar radiation than they reflect (Oke 1982; Lopes et al. 2001; Błażejczyk
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