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Role of ocean–atmosphere interactions on contrasting characteristics of two cyclones over the Arabian Sea

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Abstract

The role of ocean–atmosphere interaction in modulating the track and intensity of two cyclonic storms, Nisarga and Nanauk, which originated from almost similar locations in June in the Arabian Sea with completely different tracks, is investigated in this study. Sea surface temperature (SST), steering flow, relative vorticity, latent heat flux (LHF), specific humidity, vertical wind shear (VWS), outgoing longwave radiation (OLR), convective available potential energy (CAPE), and Madden–Julian oscillation (MJO) phases are analyzed to elucidate the causes of contrasting characteristics of these two cyclones. During the progression and intensification of the storm Nanauk, SST decreased drastically (magnitude of ~ 4 °C), while VWS anomaly is found to be increased (~ 8 ms−1), followed by entrainment of dry air leading to a decrease in upward LHF anomaly (~ 3.5 to 4 J m−2) hindering further moisture supply. Moreover, just before the storm initiation, the CAPE anomaly was around − 800 to − 1000 J kg–1 and the MJO condition was also unfavorable for the continuous intensification of the cyclone. All these factors contributed to the quick dissipation of cyclone Nanauk. However, high SST (~ 31 °C) along with other favorable atmospheric conditions contrary to cyclone Nanauk provided a conducive environment for Nisarga to intensify and prevail. A high-pressure anticyclonic circulation at the eastern side of Nisarga over Indian land dragged the storm north-eastwards across the Maharashtra coast. The convective phase of MJO (magnitude > 1) along with the strong lower tropospheric westerly wind at the west side of the convective system also helped cyclone Nisarga to propagate eastward.

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All the datasets used in this study are obtained from open source as acknowledged.

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Acknowledgements

The authors are grateful to the reviewers for their valuable suggestions. The authors acknowledge the India Meteorological Department (IMD) Regional Specialised Meteorological Centre (RSMC), Optimum Interpolation Sea Surface Temperature (OISST), and Australian Bureau of Meteorology for providing the required data for this study. European Centre for Medium-Range Weather Forecasts (ECMWF) is acknowledged for providing ECMWF Re-Analysis (ERA-interim) data. The authors are grateful for the support of the head, of CSIR 4PI. The first author of the paper is supported by a grant from CSIR-NCP (Grant No.31-2(281)/2021-22/Bud).

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Correspondence to P. Ipsita.

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Ipsita, P., Rakesh, V. & Mohapatra, G.N. Role of ocean–atmosphere interactions on contrasting characteristics of two cyclones over the Arabian Sea. Meteorol Atmos Phys 135, 50 (2023). https://doi.org/10.1007/s00703-023-00987-w

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  • DOI: https://doi.org/10.1007/s00703-023-00987-w

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