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

Vijayakumar, R and Kulkarni, JR (1995) The variability of the interannual oscillations of the indian summer monsoon rainfall. Advances in Atmospheric Sciences, 12 (1). pp. 95-102.

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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.

Item Type: Article
Additional Information: Copyright of this article belongs to Science Press
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 29 May 2015 10:08
Last Modified: 29 May 2015 10:08
URI: http://moeseprints.incois.gov.in/id/eprint/1027

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