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Assessing tropical cyclones characteristics over the Arabian Sea and Bay of Bengal in the recent decades

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Abstract

The tropical cyclones (TCs) are most likely to increase over the North Indian Ocean (NIO) due to rapid heating in a warming climate. However, past studies have made contrasting statements while analyzing different study periods. This study examines the variability of TC’s characteristics such as severity, frequency, and longevity over the Arabian Sea (ARB) and the Bay of Bengal (BoB) during the satellite era (1990–2017). The cumulative frequency of depression, deep depression events and intense storms (combining very severe cyclonic storms, extremely severe cyclonic storms, and super cyclonic storms) have been found to increase (decrease) in the ARB (BoB). However, the cumulative frequency of all TCs (wind speed > 61 kmph) in the two basins has shown an insignificant change during the study period. The number of annual cyclonic days over both the basins has also witnessed a slight enhancement, suggesting an increase in the duration of TCs. Wind-driven energy metrics “power dissipation index (PDI)” and “accumulated cyclone energy (ACE)” are computed and compared against the mean sea level pressure-driven metric “accumulated cyclone intensity (ACI)” using the ‘Best-Tracks’ data from the India Meteorological Department (IMD), analyzing the climatology of cyclone’s destruction potential, energy, and intensity. The trends for three metrics have revealed a rise (fall) in the ARB (BoB), although not significant. Results indicate that the ARB basin has shown a higher capability of developing very intense TCs when compared to the BoB basin in recent years. Annually integrated values of the employed metrics have evidently affirmed the associated variations during the El Nino, La Nina, and Indian Ocean Dipole (IOD) phases. ACI values over both the basins were found to be increased in the La Nina years, whereas it decreased (increased) in the negative IOD years over the ARB (BoB).

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Data availability

The datasets used in this study are freely available and can be downloaded from the following links:

https://ggweather.com/enso/oni.htm.

http://www.bom.gov.au/climate/iod/.

https://psl.noaa.gov/gcos_wgsp/Timeseries/Data/nino34.long.data.

https://rsmcnewdelhi.imd.gov.in/report.php?internal_menu=MzM .

https://cds.climate.copernicus.eu/cdsapp#!/search?type=dataset.

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Acknowledgements

The first author is thankful to the Department of Science and Technology, Government of India, for giving the DST-INSPIRE research fellowship, registration number IF160165. Indian Institute of Science Education and Research (IISER) Bhopal has provided the research facilities and laboratory environment. Pankaj Kumar acknowledges funding from the Department of Science and Technology (DST), Government of India, grant number DST/INT/RUS/RSF/P-33/G, and the Russian Science Foundation (Project No.: 19-47-02015). Aaquib Javed acknowledges IISER Bhopal for the PhD fellowship. For data used in the study, India Meteorological Department, European Centre for Medium-range Weather Forecasting, National Oceanic and Atmospheric Administration-Physical Sciences Laboratory, Climate Prediction Center, and Met Office Hadley Centre are acknowledged.

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Correspondence to Pankaj Kumar.

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Tiwari, G., Kumar, P., Javed, A. et al. Assessing tropical cyclones characteristics over the Arabian Sea and Bay of Bengal in the recent decades. Meteorol Atmos Phys 134, 44 (2022). https://doi.org/10.1007/s00703-022-00883-9

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  • DOI: https://doi.org/10.1007/s00703-022-00883-9

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