Upper Ocean Response to the Tropical Cyclone Ockhi and its Impact on Primary Production in Arabian Sea

S Saranya Ganesh, S Abhilash, A K Sahai, Athira U, S Josepha P, P Vijaykumar, Max Millan and B Chakrapani
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S Abhilash: Indian Institute of Tropical Meteorology, India
Max Millan: Department of Atmospheric Sciences, Cochin University of Science and Technology, India
B Chakrapani: School of Global studies, University of Sussex, UK

Oceanography & Fisheries Open Access Journal, 2019, vol. 10, issue 3, 76-83

Abstract: This study investigates the upper ocean response and primary productivity over Arabian Sea due to tropical cyclone ‘Ockhi’, a rare tropical storm system that formed over southwest Bay of Bengal and moved westward into the Arabian Sea while rapidly intensifying into a severe storm. Multi-satellite data products comprising Sea Surface Temperature (SST), turbulent fluxes, surface wind, and Ekman pumping derived from European Reanalysis – 5 (ERA5) daily surface wind data is used to examine the evolution and life cycle of the storm. MODIS derived Chlorophyll-a (Chlor-a), daily averaged Photosynthetically Available Radiation (PAR) and Particulate Organic Carbon (POC) are utilized for detailed analysis of the impact of the storm. Evolution of SST starting from the week prior to Ockhi shows that Southeast Arabian Sea and South-west Bay of Bengal regions had high values ranging from 28 to more than 30ºC, temperatures favorable enough to fuel the intensification of Ockhi. As the storm system moved north-westward, a clear reduction in SST is observed over the west-central Arabian Sea, affirming the upper ocean cooling associated with strong upwelling in the storm centre.

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Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:adp:jofoaj:v:10:y:2019:i:3:p:76-83

DOI: 10.19080/OFOAJ.2019.10.555786

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