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Role of ocean heat content in boosting post-monsoon tropical storms over Bay of Bengal during La-Niña events


This study aims to analyze the role of ocean heat content in boosting the post-monsoon cyclonic activities over Bay of Bengal during La-Niña events. In strong La-Niña years, accumulated cyclone energy in Bay of Bengal is much more as compared to any other year. It is observed that during late June to October of moderate to strong La-Nina years, western Pacific is warmer. Sea surface temperature anomaly of western Pacific Ocean clearly indicates the presence of relatively warmer water mass in the channel connecting the Indian Ocean and Pacific Ocean, situated above Australia. Ocean currents transport the heat zonally from Pacific to South eastern Indian Ocean. Excess heat of the southern Indian Ocean is eventually transported to eastern equatorial Indian Ocean through strong geostrophic component of ocean current. By September the northward transport of this excess heat from eastern equatorial Indian Ocean to Bay of Bengal takes place during La-Nina years boosting the cyclonic activities thereafter.

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Authors would like to thank the Director, SAC and Deputy Director (EPSA) for their great support and encouragement for this work. This work would not be complete without the data provided by ISRO, AVISO, JTWC, NOAA and ECMWF.

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Correspondence to Suchandra Aich Bhowmick.

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This paper is a contribution to the special collection on ENSO Diversity. The special collection aims at improving understanding of the origin, evolution, and impacts of ENSO events that differ in amplitude and spatial patterns, in both observational and modeling contexts, and in the current as well as future climate scenarios. This special collection is coordinated by Antonietta Capotondi, Eric Guilyardi, Ben Kirtman and Sang-Wook Yeh.

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Bhowmick, S.A., Agarwal, N., Ali, M.M. et al. Role of ocean heat content in boosting post-monsoon tropical storms over Bay of Bengal during La-Niña events. Clim Dyn 52, 7225–7234 (2019).

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