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Conference Paper

Late and Early Season Deficits of Indian Monsoon Rainfall: The North Atlantic Footprint

Authors

Vuruputur,  Venugopal
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Borah,  Pritam Jyoti
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sukhatme,  Jai
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Vuruputur, V., Borah, P. J., Sukhatme, J. (2023): Late and Early Season Deficits of Indian Monsoon Rainfall: The North Atlantic Footprint, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3512


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019428
Abstract
El Nino is often considered to be a major tropical forcing that has a tendency to suppress Indian summer monsoon rainfall (ISMR; June through September) through various teleconnection pathways. The work presented here systematically characterises the midlatitude influence on the evolution of both late and early season monsoon rainfall. In particular, we show that in years when the equatorial Pacific Ocean and Indian ocean temperatures are near-neutral, significant deficits in late-August/early-September as well as June rainfall can be associated with a Rossby wave-train originating from a persistent (2 to 3 week duration) deep tropospheric vorticity forcing located in the North Atlantic. We will also discuss the implications of our findings on ISMR predictability.