Interdecadal Changes in the ENSO–Monsoon System
Christopher TorrenceAd-vanced Study Program, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000Peter J. WebsterProgram in Atmospheric and Oceanic Sciences, University of Colorado, Boulder, Colorado
1999en
ABI
Abstract
The El Nin o-Southern Oscillation (ENSO) and Indian monsoon are shown to have undergone significant interdecadal changes in variance and coherency over the last 125 years. Wavelet analysis is applied to indexes of equatorial Pacific sea surface temperature (Nin o3 SST), the Southern Oscillation index, and all-India rainfall. Time series of 2-7-yr variance indicate intervals of high ENSO-monsoon variance (1875ENSO-monsoon variance ( -1920ENSO-monsoon variance ( and 1960-90) -90) and an interval of low variance . The ENSO-monsoon variance also contains a modulation of ENSOmonsoon amplitudes on a 12-20-yr timescale.
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