Struktura pola opadów Polski na tle warunków cyrkulacyjnych
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Date
2010
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Wydawnictwo Poznańskiego Towarzystwa Przyjaciół Nauk
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Abstract
The way circulation factors influence the spatial structure of the precipitation area in Poland was
studied on the basis of everyday pluviometric data from 31 metrological stations as well as a circulation catalogue
published by M. Stępniewska-Podrażka. The analysis covered all 7-day-long or longer periods which
displayed the same type of circulation in the years 1951–1990. The pluviometric data gathered made it possible
to characterise the pluviometric regimes for each town in the specified periods taking account of 3 factors:
total precipitation, frequency of precipitation and intensity of precipitation. The study focused on pluviometric
similarities between neighbouring points (stations) under specified conditions of atmospheric circulation.
When considering matters related to the objective of the study, account was taken of the elements of the graph
theory which not only made it possible to graphically represent the directions of similarity research but also
showed the degree of consistency between pluviometric similarity networks from a statistical point of view.
The research uncovered some particular features of structural organisation of the precipitation area depending
on the conditions of atmospheric circulation:
–– Variation in similarity within the precipitation areas is disturbed to a different degree The number of
similar relations in constructed graph networks varied between 9 and 75.
–– Cases of perfect similarity can be observed only under anti-cyclonic circulation and were present in SEa,
Sa and Oa circulation types.
–– The degree of similarity within the precipitation area varies depending on the character of circulation. The
mean frequency with which precipitation similarities were identified along studied edges is at its lowest
under cyclonic circulation and at its highest under anti-cyclonic conditions.
–– When analyzed by seasons, the frequency of pluviometric precipitation similarity along specified relation
lines was lower in the warm half-year under cyclonic, intermediate and anti-cyclonic circulation conditions.
The graph method of studying structural features of the precipitation area used in this paper has proved to
be a useful and effective research tool especially when applied to analyses of spatial relations. Presented examples
of graphs are a more or less clear indication that the spatial structure of the precipitation area in Poland
studied from the perspective of pluviometric similarity relations is determined by circulation factors with the
spatial scope of this influence depending on the season.
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Keywords
Poland, atmospheric precipitation, atmospheric circulation
Citation
Badania Fizjograficzne, Seria A, Tom 61, 2010, s. 31-72
ISBN
978-83-7654-010-8