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vol. 14, nr. 2 (2009)
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Atmospheric circulation variability in the Bydgosko-Toruński region in the period 1881-2005
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Rajmund Przybylak, Rafał Maszewski
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Department of Climatology, Institute of Geography, Nicolaus Copernicus University ul. Gagarina 9, 87-100 Toruń |
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vol. 14 (2009), nr. 2,
pp. 427-447
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abstract:
The article presents the results of research on atmospheric circulation changes in the Bydgosko-Toruński Region (RB-T) in the 1881-2005 time period. For this purpose, the catalogue of daily synoptic situations for the above Region (twenty one synoptic situations) published by the German Weather Service was used. Daily synoptic maps for the sea level were used to make the catalogue. During the period under study a statistically significant increase in the frequency of cyclonic situations (0.60 day/10 years) in the cold season and a decrease in the other seasons were observed. In a one-year-time the statistically insignificant decreases of the frequency were observed (–0.86 day/10years). Both the increase in the frequency of cyclonic situations during the cold season and of anticyclonic in the warm season cause, to a great extent, climate warming in Poland. The analysis of the frequency of particular types of circulation has shown statistically significant increase in the frequency of non-advective types (0.70÷0.80 day/10 years) and decrease in the types from the eastern sector (–0.40÷0.60 day/10 years) and, to a lesser extent, from the northern sector (0.00÷–0.30/10 years).
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keywords:
atmospheric circulation, types of circulation, Poland, long-term variability
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original in:
Polish
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