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The indian monsoon variability during the last two millennia and links to the tropical equatorial Pacific

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Abstract

This study examines the variability of the Indian summer monsoon rainfall (ISMR) during the last two millennia using a near-annually resolved speleothem oxygen isotope record from Kadapa cave in peninsular India. Our results show that the monsoon precipitation variations experienced a wet phase during the dark age cold period (DACP; ~250–800 CE) as evidenced from the progressive depletion of the δ18O values; followed by high amplitude variability during the medieval warm period (MWP; ~ 900–1300 CE), and drier monsoon conditions with enriched δ18O values during the edge of the little ice age (LIA; ~ 1500–1850 CE). It is further noted that the monsoon precipitation variability as observed in the Kadapa speleothem record during the last two millennia is corroborated by other speleothem and sediment records from the Indian subcontinent and adjoining oceanic areas. Analyses of reconstructed climate proxies, suggest that the intertropical convergence zone (ITCZ) during the DACP was stable and located relatively northward with pronounced La Niña conditions prevailing in the tropical Pacific. On the other hand, the high amplitude monsoon precipitation variations during the MWP appear to have resulted from multi-decadal fluctuations in the latitudinal position of the ITCZ, accompanied by enhanced activity of ENSO. Additionally the low monsoon precipitation during the LIA is found to be closely linked to a southward shift of the ITCZ, with precipitation reductions during the edge of LIA associated with volcanic cooling. Enriched and depleted δ18O values are consistent with the instrumental records of weakening and revival of monsoon precipitation during 1850–2000 CE and post-2000 CE, respectively.

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Acknowledgements

We thank the Director, Indian Institute of Tropical Meteorology for support and encouragement, Late Prof. Ramabrahmam Vellore, Kadapa, for his support in collecting the Speleothem sample. We also thank the Physical Research Laboratory, Ahmedabad for stable isotope analysis on IRMS, and Dr. G. R. Tripathy, Indian Institute of Science and Education Research for XRD analyses. The National Oceanic and Atmospheric Administration (NOAA)/ National Climatic Data Center (NCDC) paleoclimatology program is acknowledged for providing proxy data. The work was supported by the PACMEDY Project under the Ministry of Earth Sciences, India, and Belmont Forum, Paris, France. We thank Mr. Mahesh P. Kalshetti, Mr. Naresh Ganeshi, Mr. Ajinkya Aswale and Dr. Dandi Ramu for their support in graphic illustration with NCL and data analysis in CDO. Thank the anonymous reviewers for their constructive comments and suggestions.

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Correspondence to Naveen Gandhi.

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Reddy, A.P., Gandhi, N., Yadava, M.G. et al. The indian monsoon variability during the last two millennia and links to the tropical equatorial Pacific. Clim Dyn 60, 3645–3660 (2023). https://doi.org/10.1007/s00382-022-06513-9

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  • DOI: https://doi.org/10.1007/s00382-022-06513-9

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