EXTREME TEMPERATURE DAYS IN KOŁOBRZEG IN THE YEARS 1976-2005 AND THEIR RELATION TO ATMOSPHERIC CIRCULATION TYPES
Journal Title: Baltic Coastal Zone - Year 2011, Vol 15, Issue 15
Abstract
In this work a general characteristics of thermal conditions in Kołobrzeg in the years 1976-2005 is presented. The most important part of the paper is the analysis of extreme temperature days (very frosty, frosty, warm and hot) in relation to the types of atmospheric circulation (according to the classification proposed by Osuchowska-Klein 1978). Daily mean and extreme air temperature data for the weather station in Kołobrzeg were the basis of the paper. The obtained results provide strong evidence that the occurrence of days with extreme air temperatures depends mostly on the atmospheric circulation pattern. Particularly high and low air temperatures in Kołobrzeg, in most cases, are not determined by the character (cyclonic or anticyclonic) of atmospheric circulation, but mainly by the direction of air advection. More detailed analysis has revealed that in the winter months (Dec-Feb) the highest frequency of days with sub-zero maximum temperatures is usually associated with the incursion of continental polar air during anticyclonic circulation types. Conversely, maritime air flow from the Atlantic Ocean most often induced by zonal circulation (especially during cyclonic types over Poland) regularly brings warming in winter. In the warm halfyear (Apr-Sep) strong and persistent advection of the air from the southern or eastern sector (in anticyclonic types: E1, E, D2C and cyclonic ones: F and B) is the most important factor determining the occurrence of warm and hot days in Kołobrzeg. The days with tmax ≥ 25oC appear most rarely during the types accompanied by the winds from the western or northern sector.
Authors and Affiliations
Dariusz Baranowski
Keywords
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- EP ID EP160878
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