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Opady normalne i anomalne w Krakowie w latach 1850-1998. [Komunikat]

Twardosz R.

Przegląd Geofizyczny

2000

Z. 2

171-182

The paper presents an analysis of annual distribution of normal precipitation and frequency of pre-cipitation anomalies in Cracow. Annual and monthly precipitation totals from the Climatological Station of the Jagiellonian University from the years 1850-1998 were used. The method of S.Mrugała (1977) was applied in order to determine the norm and anomalies of precipitation. Long-time regularities of anomalies as well as correlation between periods with precipitation above and below norm on the one hand and synoptic situations according to classification of T.Niedźwiedź (1999) on the other were determined. Considerable differentiation of normal and anomalous precipitation was pointed out, both in the annual and long-term course. Negative anomalies are more frequent and last longer than the posi-tive ones both in a year and in particular months. It was determined that the sign of the annual precipitation anomaly depends on the distribution of frequency of anomalies in particular months. Such relations turned out to be strongest in case of below norm precipitation, when the frequency of negative anomalies was predominating in all the months, while in June and August only negative anomalies took place. The occurrence of anomalous periods is conditioned by the kind of synoptic situation. It was calcu-lated that during the periods of negative precipitation anomalies there is an increase of frequency of anticyclonic situations (Ka and WA), while positive precipitation anomalies correspond to the growth of frequency of cyclonic situations (Wc, Bc, Nc).