Browsing by Author "Tomczyk, Arkadiusz"
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Item Atlas klimatu Polski (1991–2020)(Bogucki Wydawnictwo Naukowe, 2022) Tomczyk, Arkadiusz; Bednorz, EwaItem Fale mrozów w Poznaniu i ich cyrkulacyjne uwarunkowania(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2016) Tomczyk, ArkadiuszThe article aims to determine the long-term variability of frosty days and frost waves occurrence in Poznań, as well as to define the pressure conditions triggering off frost waves. A frosty day was defined as a day with the maximum temperature below the 5th percentile of the daily maximum temperature from a whole year (-1.7°C). A frost wave was defined as a sequence of at least 5 frosty days. In the analysed period, there were 44 frost waves which in total took 406 days. The most frequent were 7-day waves which represented 25% of all the frost waves. These tended to occur between November and March, with a majority of them (as much as 54.5%) in January. The occurrence of frost waves in Poznań in the discussed multiannual period was related to a ridge of high pressure above Eastern and Central Europe. During frost waves, the pressure over the analysed area was higher than the average in the winter season. According to the Grosswetterlagen (GWL) classification of weather types, frosty days forming frost waves were mainly associated with the anticyclonic circulation (54.0%).Item The period of intense vegetation growth and maturing of plants in north-western Poland(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2017) Tomczyk, Arkadiusz; Szyga-Pluta, KatarzynaThe objective of the study consisted in determining the changeability of the dates of commencement and termination of the period of intense vegetation growth and the period of maturing of plants in north-western Poland, and also the respective durations thereof. Use was made of data concerning average monthly air temperatures for the years 1966–2015, which were obtained from the collections of the Institute of Meteorology and Water Management – National Research Institute. The period of intense vegetation growth has been defined as a period with average daily air temperature of ≥ 10oC, whereas the period of maturing of plants as one with an average daily air temperature of ≥ 15oC. The dates of commencement and termination of the aforementioned periods were determined using mathematical formulae proposed by Gumiński. On average, the period of intense vegetation growth commenced 3 days/10 years earlier and terminated 1 day/10 years later. In turn, the period of maturing of plants commenced on average 2 days/10 years earlier and terminated on average 2 days/10 years later. Research also revealed an increase in the duration of both the period of intense vegetation growth, and the period of maturing of plants in north-western Poland.