PERIODICITY OF ANNUAL PRECIPITATION IN DIFFERENT CLIMATE REGIONS OF CROATIA

The periodicity of a 100-year series of annual precipitation over Croatia has been studied by means of power spectrum analysis at 3 stations representing the different climatic regions of Croatia. The annual precipitation variance spectra in the continental lowland (Osijek) and at the north East Adriatic coast (Crikvenica) can be fitted by Markov ''white noise'' continuum, but in the transitional region between the Dinaric Alps and the Pannonian lowland (Zagreb-Gric) a ''non-white noise'' continuum is necessary. Quasi-periodic oscillations appear in two spectra ranges: short (2.2 and 4.7 years) and medium (25.0 and 33.3 years). These results are compared with those of other authors for other parts of the Europe.