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O tak zwanych "trwałych typach pogody" w klimatach morskich europejskiej części atlantyckiego sektora Arktyki i Subarktyki w okresie 1961-1970

Ferdynus J.

Problemy Klimatologii Polarnej

1998

nr 8

95--103

Ocean climates of the Atlantic Sector of the Arctic and Subarctic are characterized by extremely large changeability of weather conditions appearing during a year and the subsequent years. The changeability in the annual structure of weather types is manifested by a large number of the observed weather types. In the analized stations a number af the observed weather types during a statistical year are changed from 214 at Jan Mayen to 175 af Bjőrnőya. Extremely large number of weather types are noted during the polar night (figure l) The analysis of figure l shows that in the chosen stations there appear periods in which the changeability is decreasing and the frequency of weather types is increasing. These types appear nearly every year in the same periods and their frequeney is signiticant "stable types of weather". These “stable types of weather" are observed from May to October (especially during the polar day). The weathers are characterized by large or total cloudiness, rainfall, and a slight wind speed, also there can be noted weathers with strong winds (table l). In the autumn-winter period due to the intensity of atmospheric circulation the stable weather are rarely observed. They differ from the stable weather types from the warm period. They are characterized by lack of cloudiness or moderate cloudiness (table l). Their origin is connected with the appearance of the settled and immobile anticyclone.