Power spectrum analysis of the annual rainfall series for Massachusetts (NE,U.S.A.) |
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| Authors: | R P Kane N R Teixeira |
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| Institution: | (1) Instituto de Pesquisas Espaciais - INPE, C.P. 515, 12201 São José dos Campos, SP, Brazil |
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| Abstract: | Maximum Entropy Spectral Analysis of the annual rainfall series for 1887–1976 (90 years) for Massachusetts (northeastern USA.) shows T = 17.8 (very near the 18.6 year luni-solar signal) as the most prominent periodicity. However, it explains only 12% variance. Also, the next prominent periodicity is T = 2.72 years, i.e. in the QBO (Quasi-Biennial Oscillation, T = 2–3 years) region. Also, regular periodicities account for only 50% variance, leaving 50% as a random component. Hence, predictions are unreliable. Roughly, excess rainfall during 1990–1994 and droughts during 1992–2002 are indicated; but occasional years of opposite behavior cannot be ruled out. |
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