Browsing by Author "Wypych, Agnieszka"
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Item Fale upałów latem 2015 roku i ich uwarunkowania cyrkulacyjne(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2016) Sulikowska, Agnieszka; Wypych, Agnieszka; Woszczek, IzabelaThe main goal of the study was to characterize the thermal conditions during the hot summer of 2015 and to determine the circulation types with respect to the occurrence of extremely high air temperature and heat waves in Poland. The daily maximum (TMAX) and minimum (TMIN) air temperatures from 7 stations in Poland in 1951–2015 were used, as well as the Grosswetterlagen and Niedzwiedź circulation type classifications. A day with an extremely high air temperature (DTE) was defined as having TMAX above the 95th percentile and a heat wave as a sequence of at least 3 such days. The results prove that the summer of 2015 in Poland was unusually hot, especially in the south-western part of the country. The circulation types accompanying DTE and the heat waves were mainly anticyclonic with an advection of tropical air masses from the southern sector.Item Late spring freezes in Poland in relation to atmospheric circulation(Wydział Nauk Geograficznych i Geologicznych Uniwersytetu im. Adama Mickiewicza, 2014) Ustrnul, Zbigniew; Wypych, Agnieszka; Winkler, Julie A.; Czekierda, DanutaLate spring freeze events, a significant agroclimatic hazard, are investigated for Poland. Daily minimum air temperatures from 184 stations for the period 1951–2010 were used to analyze the frequency and conditional probability of late spring freezes. In addition, three classification schemes were employed to investigate the atmospheric circulation responsible for late spring freezes events. The findings suggest that knowledge of the airflow influencing late spring freezes can help to understand the complex historical trends and projected future changes in freeze risk for perennial crops.