Temperature extremes and circulation types in the Czech Republic, 1961-2020

0559357 - ÚVGZ 2023 RIV GB eng J - Journal Article
Zahradníček, Pavel - Brázdil, Rudolf - Řehoř, Jan - Lhotka, Ondřej - Dobrovolný, Petr - Štěpánek, Petr - Trnka, Miroslav
Temperature extremes and circulation types in the Czech Republic, 1961-2020.
International Journal of Climatology. Roč. 42, č. 9 (2022), s. 4808-4829. ISSN 0899-8418. E-ISSN 1097-0088
R&D Projects: GA MŠMT(CZ) EF16_019/0000797; GA ČR(CZ) GA18-15958S; GA MZe(CZ) QK1910338
Institutional support: RVO:86652079
Keywords : circulation type * cold-wave * the Czech Republic * day-to-day change * fluctuation * frost day * heat-wave * ice day * maximum temperature * minimum temperature * summer day * trend * tropical day * warm and cold anomalies
OECD category: Climatic research
Impact factor: 3.9, year: 2022
Method of publishing: Open access
https://rmets.onlinelibrary.wiley.com/doi/10.1002/joc.7505

This paper presents the characteristics of extreme temperatures in the Czech Republic, as calculated from homogenized series of daily maximum (TMAX) and daily minimum (TMIN) temperatures recorded by 133 climatological stations throughout the territory in the 1961-2020 period. In general, statistically significant increasing linear trends were recognized in series of absolute TMAX, absolute TMIN, numbers of summer days, tropical days, days with tropical nights, heat-wave, and warm-anomaly days. Significant decreasing linear trends appeared in series of numbers of frost days, ice days, cold-wave, and cold-anomaly days. Objective classification of circulation types demonstrated the importance of anticyclonic types (especially those with warm airflow from the southern quadrant) and an unclassified type in the development of summer hot extremes, while winter cold extremes were linked to cold (north-)easterly advection. Significant changes in the frequency of certain circulation types emerged, as well as an increasing number of anticyclonic types conducive to hot extremes, a trend that contributed to their more frequent occurrence in recent decades. Existing trends in temperatures were complemented by spatiotemporal analysis of extreme temperatures, the characteristics of extremes and the circulation types in the two ,,normal,, periods of 1961-1990 and 1991-2020. These exhibited significant differences in means and variances. The results obtained are also discussed in a broader context.
Permanent Link: https://hdl.handle.net/11104/0332695