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Role of warm ocean conditions in the genesis and rapid intensification of tropical cyclone ‘Tauktae’ along the west coast of India

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Abstract

Tropical cyclone ‘Tauktae’, in May 2021, was the strongest pre-monsoon cyclone that formed in the Arabian Sea after Kandla in 1998. It turned into an extremely severe cyclonic storm undergoing rapid intensification under favourable conditions. The current study is an effort to understand the role of warm ocean conditions favourable for the genesis and intensification of extremely severe cyclonic storm ‘Tauktae’. Very high sea surface temperature anomaly (0.8–1.6°C) and high tropical cyclone heat potential (120–140 kJ/cm2) over the tropical cyclone genesis point and along the tropical cyclone track provided the conditions for the rapid intensification of the tropical cyclone ‘Tauktae’. High sea surface temperature and tropical cyclone heat potential enhanced the accumulated cyclone energy of tropical cyclone ‘Tauktae’, which is very high when compared to the climatological mean. The presence of warm core eddies was seen in the area, where the tropical cyclone had rapidly intensified from a very severe cyclone to an extremely severe cyclonic storm from 16 to 17 May 2021. High sea surface temperature, tropical cyclone heat potential, and warm-core eddies create warm ocean conditions that provided continuous energy in the form of sensible and latent heat flux from the ocean surface to the atmosphere. Our analysis shows that along with the favourable atmospheric conditions, the excessively warm ocean led to the genesis and intensification of tropical cyclone ‘Tauktae’. As the Arabian Sea continues to warm, it is inevitable to monitor and understand its effect on tropical cyclone genesis and intensification, which can open the way to predict and mitigate the catastrophic effect of such extreme weather events over India.

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Data availability

The datasets of sea surface temperature from 1990 to 2020 having a grid resolution of 0.25°×0.25° used in the current study is available at https://psl.noaa.gov/data/gridded/data.noaa.oisst.v2.highres.html. The ocean temperature and sea surface height data that support the findings in this study is obtained from Copernicus marine service https://marine.copernicus.eu/. Data of relative vorticity, relative humidity, temperature, and wind used in this study is obtained from ECMWF https://www.ecmwf.int/en/forecasts/datasets. Further, the data on tropical cyclone wind speed and frequency are available at https://rsmcnewdelhi.imd.gov.in/. The data of geostrophic current was calculated using the zonal and meridional geostrophic velocity (aforementioned in section 4 (Eq. 4)).

Code availability

The computer code used for the analysis was written in Ferret. Specific codes will be available upon reasonable request.

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Acknowledgements

We gratefully acknowledge the Kerala University of Fisheries and Ocean Studies (KUFOS) for supporting and providing us with the facilities to do this study. We also thank the Directorate of Environment and Climate Change (DoECC), Government of Kerala, for providing the research grant to conduct the study. We thank National Oceanic and Atmospheric Administration (NOAA) and European Centre for Medium-Range Forecasts (ECMWF) from which we obtained different ocean and atmospheric data for conducting this study.

Funding

One of the authors, Athira P Ratnakaran, gratefully acknowledges Directorate of Environment and Climate Change (DoECC), Government of Kerala for providing the research grant (G.O (Rt) No.53/2021/Envt.), for conducting this research.

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Contributions

All authors contributed to the study conception, design, and interpretation of the results. Data collection and computations were performed by APR. The whole work was done under the guidance of AB. AB and APR prepared the final version of the manuscript. All authors read and approved the final manuscript.

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Correspondence to B. Abish.

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Ratnakaran, A.P., Abish, B. Role of warm ocean conditions in the genesis and rapid intensification of tropical cyclone ‘Tauktae’ along the west coast of India. Theor Appl Climatol 153, 417–430 (2023). https://doi.org/10.1007/s00704-023-04480-7

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  • DOI: https://doi.org/10.1007/s00704-023-04480-7

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