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A wavelet filter was employed for removing the strong annual wave in the Atuel river runoff data to analyze for other wavelength phenomena of interest and to examine the influence of the ENSO events. After this removal, the influence of ENSO signal in different frequency bands and indications of climatic changes in bands larger than 10 years could be observed. Other significant phenomena were also observed. As the Andean Argentinean rivers in the Cuyo region have significant similarities, the conclusions about the Atuel river could be extended to other rivers in this region.
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Compagnucci et al. (2000) studied this question.
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