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ZMIENN OŚĆ CZASOWA I ZRÓŻNICOWANIE PRZESTRZENN E ZACHM URZENIA W POLSCE W LATACH 2001–2016

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Sypniewska L., Szyga–Pluta K.
Badania Fizjograficzne Seria A - Geografia Fizyczna
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2018
|
issue 9(69)
193-213
EN
The study presents the characteristic of annual, seasonal and diurnal course of cloudiness in Poland in 2001–2016. The analysis was performed on 28 meteorological stations (IMGW-PIB); the data came from threefold climatological observations. Based on the data, the average course of annual, seasonal and diurnal cloud cover, maximum and minimum values were estimated. Moreover, the average number of characteristic nephological days during the year was calculated. The analysis confirmed a decrease in cloudiness in the spring and in the summer accompanied by an increase in the autumn and in the winter season. Furthermore, in the summer the values of diurnal cloud variation were higher in the summer than in the winter. August was the least cloudy month (56%) while December proved most cloudy (79%). During the entire period in question, the Pomeranian Lakeland was most clouded while the Szczecin Shore Zone proved the least cloudy.
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MIĘDZYDOBOWE ZMIANY BODŹ COWOŚCI CIŚNIENIA ATMOSFERYCZNEGO W POZNANIU W LATACH 1988–2017

100%
Nawrocka M., Szyga–Pluta K.
Badania Fizjograficzne Seria A - Geografia Fizyczna
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2018
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issue 9(69)
135-149
EN
The aim of the paper was to investigate the stimuli of the atmospheric pressure and the dependence of large pressure changes on atmospheric circulation in Poznań. The values of the average daily atmospheric pressure from the Poznań-Ławica meteorological station in years 1988-2017 were used. The frequency of days with atmospheric pressure greater than 1015 hPa and lower than 985 hPa as well as the number of days with interdiurnal change of the atmospheric pressure were calculated in specified ranges: 0.0-4.0 hPa, 4.1-8.0 hPa, 8.1-16.0 hPa and >16.1 hPa. Next, the conditional probability of the interdiurnal changes of the air pressure and the Grosswetterlagen (GWL) types of atmospheric circulation was determined. In Poznań in 1988–2017, the most stimulus air pressure changes occurred between November and February and the least stimulus – from May to August. Strong and very strong stimulus of atmospheric pressure is most often found in cyclonic circulation types with masses of air flowing from north-western directions.
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PERIOD OF INTENSE VEGETATION IN POLAND IN THE YEARS 1966–2015

100%
Tomczyk A. M., Szyga–Pluta K.
Badania Fizjograficzne Seria A - Geografia Fizyczna
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2018
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issue 9(69)
239-248
PL
The purpose of this paper was to determine long-range and spatial variability of the start and end dates of a period of intense vegetation in Poland in 1966–2015. The article is based on average monthly air temperature values acquired for 20 Polish stations for 1966–2015, made available by the Institute of Meteorology and Water Management – the National Research Institute. Based on the obtained data, the dates of the beginning and end of the intense vegetation period were determined. In this study, the intense vegetation period was defined as one with an average daily air temperature ≥10°C. The mathematical formulas proposed by Gumiński (1948) were used to determine the dates of the beginning and end of the period. A period of intense vegetation in Poland in the years 1966–2015 has extended. The dates of the beginning of the period of intense vegetation changed in the latitudinal system from the south to the north while the intensity of changes in the date of the beginning in the studied area was characterized by longitudinal distribution – the most prominent in the west of Poland. The end of the intense vegetation period occurs earliest in the north-east of Poland, and latest in the west and the south. The end date changes were less significant than the start date changes. The length of the intense vegetation period ranges from the north-east to the south-west of Poland, and the most dramatic changes occurred in the west and the south-east of Poland.
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