EVALUATION OF CLIMATIC-CHANGE THROUGH HARMONIC-ANALYSIS

In the present work, a precipitation and temperature series from Barce lona (Spain) are analysed in order to detect the possible existence of climatic changes or cycles. The analysis is carried out both from the temporal and spectral standpoints. The techniques used range from the ,classical periodogram and Blackman-Tukey method through to the Maximu m Entropy method. The results do not show the existence of climatic cy cles, though they do show a clear tendency toward increased precipitat ion and decreased temperature, since the last years of series.