Cycles and trends in the Czech temperature series using wavelet transform

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Authors

PIŠOFT Petr KALVOVÁ Jaroslava BRÁZDIL Rudolf

Year of publication 2004
Type Article in Periodical
Magazine / Source International Journal of Climatology
MU Faculty or unit

Faculty of Science

Citation
Field Atmosphere sciences, meteorology
Keywords climate variability; wavelet transform; temperature series; Czech Republic; trend; oscillations
Description Temperature variability in the Czech Republic is analyzed by means of the wavelet transform. This advanced time-frequency analysis provides information about the nature and time-frequency localization of present oscillations. The data-set comprises four mean monthly temperature series from Prague-Klementinum, Brno, Mt. Milešovka and the gridded temperature series for the Czech Republic. The results of their wavelet transforms are presented as a) trend analysis (computed by the inverse wavelet transform) and b) periodicities and oscillations (distinguishable from the series wavelet power spectra and global wavelet spectra). The results show considerable similarity among individual series. Examples are the common time period between 1930 and 2002 expressed in all power spectra, the pronounced oscillations of about 8 and 12-14 years in all series, and the noticeable increase of temperatures in all cases. As a supplement to this study, wavelet transforms were performed on the variance-adjusted version of combined land and marine temperature anomalies for the Northern Hemisphere from the Hadley Centre. Only some results of this analysis are mentioned and discussed.
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