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The variability of the interannual oscillations of the indian summer monsoon rainfall

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Abstract

A new method of analysis namely, Singular Spectrum Analysis (SSA) is applied to the Indian Summer Monsoon (June-September) Rainfall (ISMR) series. The method is efficient in extracting the statistically significant oscillations with periods 2.8 and 2.3 year from the white noise of the ISMR series. The study shows that 2.8 / 2.3 year cycle captures the variability of the ISMR related to Southern Oscillation / Quasi Biennial Oscillation. The temporal structure of these oscillations show that these are in phase in extreme (excess and drought) monsoon conditions as well as in El Nino Southern Oscillation (ENSO) years. Both these oscillations show minimum variability during the period 1920–1940 and there is an increasing trend in the variability of these oscillations in the recent decades. The study enables to obtain pure signal consisting of reconstructed time series using these two oscillations, from the original white noise series.

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The authors are thankful to Prof. R. N. Keshavamurty, Director for his constant encouragement. They wish to express their sincere thanks to Dr. A. S. R. Murty, Deputy Director for the guidance and valuable suggestions.

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Vijayakumar, R., Kulkarni, J.R. The variability of the interannual oscillations of the indian summer monsoon rainfall. Adv. Atmos. Sci. 12, 95–102 (1995). https://doi.org/10.1007/BF02661291

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  • DOI: https://doi.org/10.1007/BF02661291

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