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Movement of seasonal eddies and its relation with cyclonic heat potential and cyclogenesis points in the Bay of Bengal

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Abstract

Movement of seasonal eddies in the Bay of Bengal (BOB) and its relation with cyclonic heat potential (CHP) and cyclogenesis points have been investigated in this study using 6 years (2002–2007) of global ocean monthly analysis datasets based on the Simple Ocean Data Assimilation (SODA) package (SODA v2.0.4) of Carton et al. (2005) and Indian Meteorological Department cyclogenesis points. The region dominated by anticyclonic eddies with CHP greater than 70 × 107 J/m2 as well as good correlations (>0.9) with sea surface height (SSH) and 26°C isothermal depth (D 26) can be a potential region of cyclogenesis. The region dominated by cyclonic eddies with CHP greater than 50 × 107 J/m2 and good correlation (>0.9) with both SSH and D 26 can serve as a potential region of high-level depression. Potential cyclogenesis regions are the southern BOB (5°N–12°N) for the post-monsoon season and the head of BOB (north of 15°N) during southwest monsoon. Seven potential regions are identified for the eddy formation for different seasons, which are consistent with the cyclogenesis points. The CHP distributions alone are able to explain the cyclone tracks for the pre-monsoon and post-monsoon seasons but not for the monsoon season.

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Acknowledgments

The first author gratefully acknowledges the financial support from the Council of Scientific and Industrial Research (CSIR) to complete the work. This study is also supported by the INDOMOD research project (POM, RP2007) of INCOIS under the Ministry of Earth Sciences, Government of India, and the MOP-2 Program (CCM, RP2008) sponsored by SAC, ISRO. The cyclogenesis points derived from Cyclone e-Atlas of IMD are greatly acknowledged. We are thankful to the CORAL head for academic facilities and support. We are grateful to emeritus Professor P. C. Pandey for his encouragement and scientific discussions. We are also grateful to the anonymous reviewers for their valuable comments and suggestions which help to improve the manuscript.

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  1. Centre for Oceans, Rivers, Atmosphere and Land Sciences (CORAL), Indian Institute of Technology Kharagpur, Kharagpur, India

    Bishnu Kumar & Arun Chakraborty

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  1. Bishnu Kumar
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  2. Arun Chakraborty
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Correspondence to Arun Chakraborty.

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Kumar, B., Chakraborty, A. Movement of seasonal eddies and its relation with cyclonic heat potential and cyclogenesis points in the Bay of Bengal. Nat Hazards 59, 1671–1689 (2011). https://doi.org/10.1007/s11069-011-9858-9

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  • DOI: https://doi.org/10.1007/s11069-011-9858-9

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