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Wavelet analysis of precipitation extremes over India and teleconnections to climate indices

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Abstract

Precipitation patterns and extremes are significantly influenced by various climatic factors and large-scale atmospheric circulation patterns. This study uses wavelet coherence analysis to detect significant interannual and interdecadal oscillations in monthly precipitation extremes across India and their teleconnections to three prominent climate indices, namely, Niño 3.4, Pacific Decadal Oscillation, and Indian Ocean Dipole (IOD). Further, partial wavelet coherence analysis is used to estimate the standalone relationship between the climate indices and precipitation after removing the effect of interdependency. The wavelet analysis of monthly precipitation extremes at 30 different locations across India reveals that (a) interannual (2–8 years) and interdecadal (8–32 years) oscillations are statistically significant, and (b) the oscillations vary in both time and space. The results from the partial wavelet coherence analysis reveal that Niño 3.4 and IOD are the significant drivers of Indian precipitation at interannual and interdecadal scales. Intriguingly, the study also confirms that the strength of influence of large-scale atmospheric circulation patterns on Indian precipitation extremes varies with spatial physiography of the region.

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Abbreviations

ENSO:

El Niño-Southern Oscillation

IOD:

Indian Ocean Dipole

PDO:

Pacific Decadal Oscillation

SST:

Sea surface temperature

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Acknowledgements

Maheswaran Rathinasamy acknowledges the funding support from the Inspire Faculty Award, Department of Science and Technology, India (IFA-12-ENG/28) and Science and Engineering Research Board (SERB), India (ECRA/16/1721). Ankit Agarwal was financially supported by Deutsche Forschungsgemeinschaft (DFG) (GRK 2043/1) within the graduate research training group Natural risk in a changing world (NatRiskChange) at the University of Potsdam (http://www.uni-potsdam.de/natriskchange).

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Correspondence to Bellie Sivakumar.

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Rathinasamy, M., Agarwal, A., Sivakumar, B. et al. Wavelet analysis of precipitation extremes over India and teleconnections to climate indices. Stoch Environ Res Risk Assess 33, 2053–2069 (2019). https://doi.org/10.1007/s00477-019-01738-3

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  • DOI: https://doi.org/10.1007/s00477-019-01738-3

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