Role of the eastern equatorial Indian Ocean warming in the Indian summer monsoon rainfall trend

GOSWAMI BB. 2022. Role of the eastern equatorial Indian Ocean warming in the Indian summer monsoon rainfall trend. Climate Dynamics.

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Journal Article | Epub ahead of print | English

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Abstract
The Indian summer monsoon rainfall (ISMR) has been declining since the 1950s. However, since 2002 it is reported to have revived. For these observed changes in the ISMR, several explanations have been reported. Among these explanations, however, the role of the eastern equatorial Indian Ocean (EEIO) is missing despite being one of the warmest regions in the Indian Ocean, and monotonously warming. A recent study reported that EEIO warming impacts the rainfall over northern India. Here we report that warming in the EEIO weakens the low-level Indian summer monsoon circulation and reduces ISMR. A warm EEIO drives easterly winds in the Indo–Pacific sector as a Gill response. The warm EEIO also enhances nocturnal convection offshore the western coast of Sumatra. The latent heating associated with the increased convection augments the Gill response and the resultant circulation opposes the monsoon low-level circulation and weakens the seasonal rainfall.
Publishing Year
Date Published
2022-05-25
Journal Title
Climate Dynamics
Acknowledgement
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF-2018R1A5A1024958). Model simulation and data transfer were supported by the National Supercomputing Center with supercomputing resources including technical support (KSC-2019-CHA-0005), the National Center for Meteorological Supercomputer of Korea Meteorological Administration, and by the Korea Research Environment Open NETwork (KREONET), respectively. The authors declare no conflicts of interest.
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IST-REx-ID

Cite this

GOSWAMI BB. Role of the eastern equatorial Indian Ocean warming in the Indian summer monsoon rainfall trend. Climate Dynamics. 2022. doi:10.1007/s00382-022-06337-7
GOSWAMI, B. B. (2022). Role of the eastern equatorial Indian Ocean warming in the Indian summer monsoon rainfall trend. Climate Dynamics. Springer Nature. https://doi.org/10.1007/s00382-022-06337-7
GOSWAMI, BIDYUT B. “Role of the Eastern Equatorial Indian Ocean Warming in the Indian Summer Monsoon Rainfall Trend.” Climate Dynamics. Springer Nature, 2022. https://doi.org/10.1007/s00382-022-06337-7.
B. B. GOSWAMI, “Role of the eastern equatorial Indian Ocean warming in the Indian summer monsoon rainfall trend,” Climate Dynamics. Springer Nature, 2022.
GOSWAMI BB. 2022. Role of the eastern equatorial Indian Ocean warming in the Indian summer monsoon rainfall trend. Climate Dynamics.
GOSWAMI, BIDYUT B. “Role of the Eastern Equatorial Indian Ocean Warming in the Indian Summer Monsoon Rainfall Trend.” Climate Dynamics, Springer Nature, 2022, doi:10.1007/s00382-022-06337-7.

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