Geographia Polonica (1999) vol. 72, iss. 1, pp. 143-155 | Full text
Mean daily temperatures for 10 Polish meteorological stations from the period 1956-1990 were examined from the point of view of their periodicity. Classical spectrum estimation based on the Fourier transformation of the autocorrelation function was used. Particular attention was paid to similarities in power spectra for different stations. Two significant and well-marked periods are characteristic of time series for all the stations analysed: ~7.3 years and 196 days. Other common climatic fluctuations such as quasi-bien-nial, quasi-five-year or quasi-eleven-year oscillations were not found and neither were shorter cycles of the order of days or tens of days.
Krzysztof Fortuniak, Zakład Meteorologii i Klimatologii, Uniwersytet Łódzki, Lipowa 81, 90-568 Łódź, Poland
Kazimierz Kłysik, Zakład Meteorologii i Klimatologii, Uniwersytet Łódzki, Lipowa 81, 90-568 Łódź, Poland