Badania Fizjograficzne, Seria A, Tom 68, 2017
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Browsing Badania Fizjograficzne, Seria A, Tom 68, 2017 by Author "Szyga-Pluta, Katarzyna"
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Item Przymrozki i okres bezprzymrozkowy w latach 2001–2016 na Stacji Ekologicznej w Jeziorach (Wielkopolski Park Narodowy)(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2017) Szyga-Pluta, KatarzynaThe paper presents the characteristics of frosts occurrence at the Ecological Station in Jeziory (Wielkopolski National Park) in years 2001–2016. The frequency of occurrence of frosts in the spring and autumn, their intensity and duration of the frost-free period were analyzed. A tendency was observed to extend the frost-free period, which results primarily from the early disappearance of spring frosts. The slight frosts occurred the most often in Jeziory. The most severe frosts occurred occasionally due to the specific location of the station on the forest clearing.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.Item Variation of cloudiness in the mountain region on the example of the Sudetes(Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk, 2017) Szyga-Pluta, KatarzynaThe purpose of the study is to present a comparison of cloudiness at different levels of a mountain region and to emphasize the specific characteristics of cloud cover observed in valleys and on mountain summits, based on the example of the Sudetes. The analysis is based on cloudiness observations made in Jelenia Góra and on Mt Śnieżka in the years 1971–2015. The results obtained in the study demonstrate that the average cloudiness generally increases with altitude in the Sudetes. However, in the colder half of the year, in anticyclonic weather and thermal inversion conditions, this system may be inverted. There are more cloudless and clear days on average in the valleys and more overcast and cloudy days recorded at the tops of the Sudetes. The annual cloud cover amount is similar, due to atmospheric circulation. The diurnal pattern varies as an effect of the influence of local conditions. The increase in cloudiness during the period from 1971–2015 is more significant in Jelenia Góra than on Śnieżka.