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

• Main Authors: Vuruputur, Venugopal, Borah, Pritam Jyoti, Sukhatme, Jai
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Indian; Pacific; North Atlantic
• Online Access: https://dx.doi.org/10.57757/iugg23-3512; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019428

<!--!introduction!--> 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. ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...