Role of warm ocean conditions and the MJO in the genesis and intensification of extremely severe cyclone Fani

Abstract Cyclone Fani, in April 2019, was the strongest pre-monsoon cyclone to form in the Bay of Bengal after 1994. It underwent rapid intensification and intensified quickly to an extremely severe cyclone. It maintained a wind speed of ≥ 51 m s−1 (≥ 100 knots) for a record time period of 36 h. The...

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Autores principales:	Vineet Kumar Singh, M. K. Roxy, Medha Deshpande
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a557f2b170be40059a3e199fa5b2942d
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spelling	oai:doaj.org-article:a557f2b170be40059a3e199fa5b2942d2021-12-02T12:09:51ZRole of warm ocean conditions and the MJO in the genesis and intensification of extremely severe cyclone Fani10.1038/s41598-021-82680-92045-2322https://doaj.org/article/a557f2b170be40059a3e199fa5b2942d2021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-82680-9https://doaj.org/toc/2045-2322Abstract Cyclone Fani, in April 2019, was the strongest pre-monsoon cyclone to form in the Bay of Bengal after 1994. It underwent rapid intensification and intensified quickly to an extremely severe cyclone. It maintained a wind speed of ≥ 51 m s−1 (≥ 100 knots) for a record time period of 36 h. The total lifespan of the cyclone was double than the climatological lifespan. Also, the duration of the cyclone in its extremely severe phase and the accumulated cyclone energy were significantly larger than the climatological records for the pre-monsoon season. In the current study, we investigate the ocean-atmospheric conditions that led to its genesis, rapid intensification and long lifespan. Our analysis shows that the Madden Julian Oscillation and anomalous high sea surface temperatures provided conducive dynamic and thermodynamic conditions for the genesis of cyclone Fani, despite forming very close to the equator where cyclogenesis is generally unlikely. Further, favourable ocean subsurface conditions and the presence of a warm core eddy in the region led to its rapid intensification to an extremely severe cyclone. A large area of warm ocean surface and subsurface temperatures aided the cyclone to maintain very high wind speed for a record time period. The vital role of the ocean surface and the subsurface in the genesis and the intensification highlights the need to efficiently incorporate ocean initial conditions (surface and sub-surface) and ocean–atmosphere coupling in the operational cyclone forecasting framework.Vineet Kumar SinghM. K. RoxyMedha DeshpandeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Vineet Kumar Singh M. K. Roxy Medha Deshpande Role of warm ocean conditions and the MJO in the genesis and intensification of extremely severe cyclone Fani
description	Abstract Cyclone Fani, in April 2019, was the strongest pre-monsoon cyclone to form in the Bay of Bengal after 1994. It underwent rapid intensification and intensified quickly to an extremely severe cyclone. It maintained a wind speed of ≥ 51 m s−1 (≥ 100 knots) for a record time period of 36 h. The total lifespan of the cyclone was double than the climatological lifespan. Also, the duration of the cyclone in its extremely severe phase and the accumulated cyclone energy were significantly larger than the climatological records for the pre-monsoon season. In the current study, we investigate the ocean-atmospheric conditions that led to its genesis, rapid intensification and long lifespan. Our analysis shows that the Madden Julian Oscillation and anomalous high sea surface temperatures provided conducive dynamic and thermodynamic conditions for the genesis of cyclone Fani, despite forming very close to the equator where cyclogenesis is generally unlikely. Further, favourable ocean subsurface conditions and the presence of a warm core eddy in the region led to its rapid intensification to an extremely severe cyclone. A large area of warm ocean surface and subsurface temperatures aided the cyclone to maintain very high wind speed for a record time period. The vital role of the ocean surface and the subsurface in the genesis and the intensification highlights the need to efficiently incorporate ocean initial conditions (surface and sub-surface) and ocean–atmosphere coupling in the operational cyclone forecasting framework.
format	article
author	Vineet Kumar Singh M. K. Roxy Medha Deshpande
author_facet	Vineet Kumar Singh M. K. Roxy Medha Deshpande
author_sort	Vineet Kumar Singh
title	Role of warm ocean conditions and the MJO in the genesis and intensification of extremely severe cyclone Fani
title_short	Role of warm ocean conditions and the MJO in the genesis and intensification of extremely severe cyclone Fani
title_full	Role of warm ocean conditions and the MJO in the genesis and intensification of extremely severe cyclone Fani
title_fullStr	Role of warm ocean conditions and the MJO in the genesis and intensification of extremely severe cyclone Fani
title_full_unstemmed	Role of warm ocean conditions and the MJO in the genesis and intensification of extremely severe cyclone Fani
title_sort	role of warm ocean conditions and the mjo in the genesis and intensification of extremely severe cyclone fani
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a557f2b170be40059a3e199fa5b2942d
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_version_	1718394647185719296

Role of warm ocean conditions and the MJO in the genesis and intensification of extremely severe cyclone Fani

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