Observational perspective of SST changes during life cycle of tropical cyclones over Bay of Bengal

Praveen Kumar Pothapakula, Krishna K. Osuri, Sujata Pattanayak, U. C. Mohanty (), Sourav Sil and Raghu Nadimpalli
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Praveen Kumar Pothapakula: Indian Institute of Technology Bhubaneswar
Krishna K. Osuri: National Institute of Technology Rourkela
Sujata Pattanayak: Indian Institute of Technology Bhubaneswar
U. C. Mohanty: Indian Institute of Technology Bhubaneswar
Sourav Sil: Indian Institute of Technology Bhubaneswar
Raghu Nadimpalli: Indian Institute of Technology Bhubaneswar

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2017, vol. 88, issue 3, No 23, 1769-1787

Abstract: Abstract Sea surface temperature (SST) plays a significant role in tropical cyclone (TC) formation and intensity evolution, while at the same time, TC induces SST changes during its life cycle. This work deals with the TC-induced SST changes associated with 21 TCs of Bay of Bengal (BoB) during 2006–2013. The SST analyses obtained from National Centre for Oceanic Information Services (INCOIS-SST) and real-time global SST (RTG-SST) are used along with buoy observations. Initial analyses reveal that INCOIS-SST is consistently better than RTG-SST with a good correlation and least root-mean-square error for both post- and pre-monsoon seasons. Overall results demonstrated that mean SST cooling decreases with increased translation speed of TCs within a radius of 50, 100 and 200 km from its centre. Further, a maximum SST cooling of ~2 and ~1.8 °C is noticed in pre- and post-monsoon, respectively, within the radial distance of 50–100 km from centre for slow-moving TCs, 1.2 and 1.0 °C for moderate and 0.9 and 0.7 °C for fast-moving TCs. The TCs formed over the southern BoB have a greater SST cooling up to 200 km radial distance followed by those formed over central and northern BoB in pre- and post-monsoon; however, the magnitudes of cooling in pre-monsoon seasons are greater than post-monsoon season. The minimum cooling over northern BoB may be attributed to the strong haline stratification as compared to the central and southern BoB during both seasons. However, there is a higher magnitude of stratification in post- compared to pre-monsoon, which might play a significant role in lesser SST cooling in post-monsoon season compared to pre-monsoon season.

Keywords: Tropical cyclones; Sea surface temperature; Bay of Bengal; Post-monsoon; Pre-monsoon (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1007/s11069-017-2945-9

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