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Winter UTCI variability in Poland in the 21st century

100%
Wereski S., Krzyżewska A., Dobek M.
Miscellanea Geographica. Regional Studies on Development
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2020
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vol. 24
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issue 3
128-137
EN
The study analyses spatial and temporal variability of the UTCI index during winter seasons in Poland in the 21st century. The most frequent UTCI thermal stress category was moderate cold stress with a frequency varying from 45.8% in Łeba (Coastal region) to 66.1% in Zielona Góra (Central region). In mountain areas, this class was less frequent (7.3-12.3%). The second most frequent class was strong cold stress with values from 11.1% in Zakopane (Carpathian region) to 43.4% in Suwałki (North-East region). In mountain areas, very strong cold stress and extreme cold stress occurred frequently (25.0-35.5% and 17.7-52.0%, respectively). Few cases of extreme cold stress were observed on other Polish stations. Thermoneutral zone was not recorded in the mountain area, although on other Polish stations its frequency ranged from 0.1% in Chojnice, Suwałki and Białystok located in northern part of Poland to 4.3% in Zakopane (Carpathian region).
2
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Impact of atmospheric circulation on the occurrence of very strong and extreme cold stress in Poland

100%
Owczarek M., Tomczyk A. M.
Quaestiones Geographicae
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2022
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vol. 41
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issue 3
111-126
EN
The primary objective of the study was the determination of the spatial and multiannual variability of occurrence of days with very strong and extreme cold stress in Poland according to the Universal Thermal Climate Index (UTCI), as well as determination of baric conditions favouring their occurrence. The study was based on data from the years 1966/67 to 2018/19 from the Institute of Meteorology and Water Management – National Research Institute and National Centre for Environmental Prediction/National Centre for Atmospheric Research (NCEP/NCAR). The research showed a statistically significant decrease in the number of days with very strong and extreme cold stress on half of the analysed stations, and a slight tendency or no changes on the remaining stations. The occurrence of days with extreme cold stress in Poland, as revealed by the analysis was primarily related to the presence of high-pressure systems blocking zonal circulation. The study resulted in the designation of three circulation types, i.e. two types related to anticyclonic systems and one cyclonic type.
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Bodźcowość warunków biometeorologicznych we Wrocławiu

84%
Bryś K., Ojrzyńska H.
Acta Geographica Lodziensia
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2016
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vol. 104
193-200
PL
Bodźcowość warunków biometeorologicznych we Wrocławiu przeanalizowana została na podstawie wartości wskaźnika oceny obciążeń cieplnych człowieka UTCI (Universal Thermal Climate Index) w latach 2008–2014. Wyliczono je z danych o kroku godzinowym otrzymanych z Obserwatorium Agro- i Hydrometeorologii Uniwersytetu Przyrodniczego we Wrocławiu, z uwzględnieniem składowych całkowitego bilansu promieniowania słonecznego. Analizie poddane zostały roczne i wieloletnie przebiegi wartości wskaźnika UTCI oraz częstość występowania klas wartości wskaźnika odpowiadających określonej bodźcowości (stres ciepła i zimna). Dla wybranych okresów fal ciepła i chłodu porównano przebiegi głównych meteorologicznych determinant wskaźnika UTCI. Potwierdzono słabą bodźcowość warunków biometeorologicznych Wrocławia. Wykazano, że warunki biometeorologiczne wrocławskich przedmieść charakteryzują się znaczną frekwencją braku obciążeń cieplnych. Zaznaczono, że w ostatnich latach wzrasta liczba sytuacji ze stresem zimna, co w obszarach o stosunkowo niskiej szorstkości podłoża spowodowane jest dynamiką ruchu powietrza w częściej występujących sytuacjach cyklonalnych.
EN
Stimulating qualities of biometeorological conditions of Wrocław were analyzed on the basis of the values of the Universal Thermal Climate Index (UTCI) of the years 2008–2014. UTCI values were calculated from 1-hour data with the use of components of solar radiation balance, measured in the Agro- and Hydrometeorological Observatory of Wrocław University of Environmental and Life Science. Annual and long-standing courses of UTCI and the occurrence frequency of UTCI levels corresponding to a specific stimulating condition (heat and cold stress) were analyzed. For the selected coldwave and heat-wave, the courses of the main meteorological determinants of UTCI were compared. It was demonstrated that the biometeorological conditions of Wrocław suburbia are characterized by a considerable frequency of heat load deficit. It was remarked that the number of incidents of cold stress has increased in recent years. In in the areas of relatively smal l surface roughness, the reason can be attributed to the dynamics of the wind in more frequently occurring cyclonic circulation.
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