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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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  • Bishnu Kumar
  • Arun Chakraborty

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 × 10 7 J/m 2 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 × 10 7 J/m 2 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. Copyright Springer Science+Business Media B.V. 2011

Suggested Citation

  • Bishnu Kumar & Arun Chakraborty, 2011. "Movement of seasonal eddies and its relation with cyclonic heat potential and cyclogenesis points in the Bay of Bengal," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 59(3), pages 1671-1689, December.
    • Handle: RePEc:spr:nathaz:v:59:y:2011:i:3:p:1671-1689
    DOI: 10.1007/s11069-011-9858-9
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    References listed on IDEAS

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    1. Y. Sadhuram & B. Rao & D. Rao & P. Shastri & M. Subrahmanyam, 2004. "Seasonal Variability of Cyclone Heat Potential in the Bay of Bengal," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 32(2), pages 191-209, June.
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