Climate Dynamics

, Volume 21, Issue 3–4, pp 233–242 | Cite as

Pacific decadal oscillation and variability of the Indian summer monsoon rainfall

  • R. Krishnan
  • M. Sugi


Recent studies have furnished evidence for interdecadal variability in the tropical Pacific Ocean. The importance of this phenomenon in causing persistent anomalies over different regions of the globe has drawn considerable attention in view of its relevance in climate assessment. Here, we examine multi-source climate records in order to identify possible signatures of this longer time scale variability on the Indian summer monsoon. The findings indicate a coherent inverse relationship between the inter-decadal fluctuations of Pacific Ocean sea surface temperature (SST) and the Indian monsoon rainfall during the last century. A warm (cold) phase of the Pacific interdecadal variability is characterized by a decrease (increase) in the monsoon rainfall and a corresponding increase (decrease) in the surface air temperature over the Indian subcontinent. This interdecadal relationship can also be confirmed from the teleconnection patterns evident from long-period sea level pressure (SLP) dataset. The SLP anomalies over South and Southeast Asia and the equatorial west Pacific are dynamically consistent in showing an out-of-phase pattern with the SLP anomalies over the tropical central-eastern Pacific. The remote influence of the Pacific interdecadal variability on the monsoon is shown to be associated with prominent signals in the tropical and southern Indian Ocean indicative of coherent inter-basin variability on decadal time scales. If indeed, the atmosphere–ocean coupling associated with the Pacific interdecadal variability is independent from that of the interannual El Niño-Southern Oscillation (ENSO), then the climate response should depend on the evolutionary characteristics of both the time scales. It is seen from our analysis that the Indian monsoon is more vulnerable to drought situations, when El Niño events occur during warm phases of the Pacific interdecadal variability. Conversely, wet monsoons are more likely to prevail, when La Niña events coincide during cold phases of the Pacific interdecadal variability.


Monsoon Rainfall Pacific Decadal Oscillation Indian Summer Monsoon India Summer Monsoon Rainfall Southern Indian Ocean 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



A substantial part of this work was carried out when the author RK was a visiting researcher at the Frontier Research System for Global Change (FRSGC), Tsukuba, Japan. Part of the work was carried out under the Indian Ocean Modelling/Department of Ocean Development (INDOMOD/DOD) project. We are very grateful to Prof. Suki Manabe for meticulously reviewing this manuscript and for providing us valuable suggestions and insights about the PDO. We thank the two referees for their helpful reviews.


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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  1. 1.Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Road, Pashan, NCL-Post, Pune 411008, India
  2. 2.Meteorological Research Institute, Tsukuba-shi, Ibaraki-Ken, Japan

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