Miesięczne warunki termiczno-opadowe i ich zależność od cyrkulacji atmosferycznej

• Autorzy: Kossowska-Cezak U.

Warianty tytułu

EN

Monthly thermal and precipitation conditions and their dependence upon atmospheric circulation

• Języki publikacji: PL

Abstrakty

EN

On the basis of two time sequences (for 1871-1970 and 1951-1994) of average monthly temperatures and monthly precipitation sums in Warsaw the nature of relation between these two quantities was analysed. Months were divided into three classes of equal cardinality: the cold, the normal and the warm ones and the dry, the normal and the rainy ones. It was stated that between November and February the cold months have precipitation at the normal level or below, while warm months have precipitation at the normal level or above. From May to September the situation is reversed: the cold months are more often rainy, while wann ones - dry. The months of March, April and October are of transitory character, since in the case of these months the cold dry and rainy as well as warm dry and rainy months occur with equal probability (Table 1 ). In the second part of the paper the frequency and the nature of anomalous months were considered, with the normal months understood as such during which temperature and precipitation are contained in the interval [multiannual average - standard deviation; multiannual average + standard deviation]. It was stated that during the cooler part of the year greater negative than positive deviations of temperature occur, and that frequently cold and very cold months are dry, while during summer there are bigger positive deviations and the warm as well as very warm months are often dry, and never rain (Table 2). The temperature and the precipitation in the months with extreme thermal and/or precipitation features were put together (Table 3) and the nature of atmospheric circulation in the anomalus months was analysed. It turned out that in winter (from November to February) the abnormally cold months feature the domination of anticyclonic eastern and northern circulation, while the abnormally warm months - domination of cyclonic western and south-western circulation. In spring (from March to May) cold months feature domination of the circulation types from the northern sector, both cyclonic and anticyclonic ones, while warm months - from the southern sector. In summer (from June to September) during the cold months cyclonic circulation from the northern sector, and especially from the north-western sector dominates, while during the warm months - anticyclonic circulation from the southern and eastern sectors. During cold October the anticyclonic circulation from the North or the East appears most often, while during warm October - cyclonic or anticyclonic circulation from the southern or south-western sector. During the whole year the dry months feature very high frequency of the anticyclonic circulation types ( especially the eastern ones), while the rainy months - the cyclonic types (Table 4).

• Wydawca: -
• Czasopismo: Prace i Studia Geograficzne
• Rocznik: 1997
• Tom: 20
• Opis fizyczny: s.125-144, tab.,bibliogr.

Twórcy

autor

Kossowska-Cezak U.

Bibliografia

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