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http://dx.doi.org/10.12989/ose.2020.10.2.181

Seasonal variability of cyclone heat potential and cyclonic responses in the Bay of Bengal characterized using moored observatories  

Vengatesan, G. (National Institute of Ocean Technology, Ministry of Earth Sciences)
Shanmugam, P. (Indian Institute of Technology)
Venkatesan, R. (National Institute of Ocean Technology, Ministry of Earth Sciences)
Vedachalam, N. (National Institute of Ocean Technology, Ministry of Earth Sciences)
Joseph, Jossia K. (National Institute of Ocean Technology, Ministry of Earth Sciences)
Publication Information
Ocean Systems Engineering / v.10, no.2, 2020 , pp. 181-199 More about this Journal
Abstract
Cyclone Heat Potential (CHP) is an essential parameter for accurate prediction of the intensity of tropical cyclones. The variability of the heat storage in the near-surface layers and the vertical stratification near the surface due to large fresh water inputs create challenges in predicting the intraseasonal and interannual evolution of monsoons and tropical cyclones in the Bay of Bengal. This paper for the first time presents the D26- referenced cyclone heat potential observed in the Bay of Bengal during the period 2012-17 based on the in-situ data collected from 5.5 million demanding offshore instrument-hours of operation in the Ocean Moored Buoy Network for Northern Indian Ocean (OMNI) buoy network by the National Institute of Ocean Technology. It is observed that the CHP in the Bay of Bengal varied from 0-220 kJ/㎠ during various seasons. From the moored buoy observations, a CHP of ~ 90 kJ/㎠ with the D26 isotherm of minimum 100m is favorable for the intensification of the post-monsoon tropical cyclones. The responses of the D26 thermal structure during major tropical cyclone events in the Bay of Bengal are also presented.
Keywords
Bay of Bengal; Cyclone Heat Potential; Tropical cyclones; OMNI Buoy;
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