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

Author

Listed:
  • Praveen Kumar Pothapakula

    (Indian Institute of Technology Bhubaneswar
    Goethe Universität)

  • 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)

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.

Suggested Citation

  • Praveen Kumar Pothapakula & Krishna K. Osuri & Sujata Pattanayak & U. C. Mohanty & Sourav Sil & Raghu Nadimpalli, 2017. "Observational perspective of SST changes during life cycle of tropical cyclones over 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. 88(3), pages 1769-1787, September.
    • Handle: RePEc:spr:nathaz:v:88:y:2017:i:3:d:10.1007_s11069-017-2945-9
    DOI: 10.1007/s11069-017-2945-9
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    References listed on IDEAS

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    1. Raghu Nadimpalli & Krishna K. Osuri & Sujata Pattanayak & U. C. Mohanty & M. M. Nageswararao & S. Kiran Prasad, 2016. "Real-time prediction of movement, intensity and storm surge of very severe cyclonic storm Hudhud over Bay of Bengal using high-resolution dynamical model," 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. 81(3), pages 1771-1795, April.
    2. Vishal Bongirwar & V. Rakesh & C. Kishtawal & P. Joshi, 2011. "Impact of satellite observed microwave SST on the simulation of tropical cyclones," 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. 58(3), pages 929-944, September.
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    Cited by:

    1. K. K. Basheer Ahammed & Arvind Chandra Pandey & Bikash Ranjan Parida & Wasim & Chandra Shekhar Dwivedi, 2023. "Impact Assessment of Tropical Cyclones Amphan and Nisarga in 2020 in the Northern Indian Ocean," Sustainability, MDPI, vol. 15(5), pages 1-21, February.

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