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The occurrence of atmospheric thaw in Poland over the last 50 years

Auteur(s) et Affiliation(s)

CZARNECKA, M.
West Pomeranian Univ. of Technology, Dept. of Meteorology and Climatology, Szczecin, Pologne
West Pomeranian Univ. of Technology, Dept. of Meteorology and Climatology, Szczecin, Pologne


Description :
The study is concerned with the temporal and spatial characterisation of atmospheric thaw variability in Poland. The phenomenon was described on the basis of mean daily values of air temperature for the winter months October-March over the period 1960/61-2009/10 obtained from 34 meteorological stations. It has been shown that atmospheric thaws occur on average as soon as 10 days after the first instance of a decrease in temperature below 0°C lasting at least 3 days. Atmospheric thaws are a constant element of the climate in Poland and occur with a frequency of 30-45% of the calendar winter (December-February) and 30% to almost 50% of the period of the thermic winter. Thaws are most common in the western part of Poland, particularly in the north-west. The spatial distribution of thaw is strongly dependent on longitude and less on height above sea level. Multiyear variability of thaw days is determined by atmospheric circulation. The role of circulation expressed by NAO index in the explanation of the variability of thaw occurrence was statistically insignificant.


Type de document :
Article de périodique

Source :
Geographia polonica, issn : 0016-7282, 2013, vol. 86, n°. 4, p. 327-340, nombre de pages : 14, Références bibliographiques : 42 ref.

Date :
2013

Editeur :
Pays édition : Pologne, Warszawa, Państwowe Wydawnictwo Naukowe

Langue :
Anglais
Droits :
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