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Contrasting Chl-a responses to the tropical cyclones Thane and Phailin in the Bay of Bengal

DRS at CSIR-National Institute of Oceanography

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Title Contrasting Chl-a responses to the tropical cyclones Thane and Phailin in the Bay of Bengal
 
Creator Vidya, P.J.
Das, S.
ManiMurali, R.
 
Subject Aquatic communities
Oceanographic support services
Meteorology and climatology
Aquatic ecology, productivity
 
Description Satellite-derived ocean colour data was used to identify the phytoplankton bloom associated with tropical cyclones Thane and Phailin in the Bay of Bengal (BoB). Cyclone Thane was category 2 cyclone (25-31 December 2011), and Phailin was category 5 cyclone (8-14 October 2013), and both occurred during the post-monsoon season. The present study examined the effect of cyclone intensity difference on the chlorophyll a (Chl-a) production in the BoB. Two and seven times Chl-a enhancement was observed after the passage of Phailin and Thane respectively. Possible causes were examined using the satellite-derived sea surface temperature, sea surface height anomalies and sea surface winds. In both cases, cyclone intensified the strength of the pre-existing cyclonic eddies after its passage. Our study shows that the strong stratification along the Phailin track suppresses the Chl-a enhancement after its passage. However, comparatively weaker stratification along the Thane track promotes entrainment of more nutrients and enhances the Chl-a production even though with lesser intensity. In this study, the extent of Chl-a production associated with cyclones was attributed to upper ocean physical processes than the intensity.
 
Date 2017-03-01T08:55:14Z
2017-03-01T08:55:14Z
2017
 
Type Journal Article
 
Identifier Journal of Marine Systems, vol.165; 2017; 103-114
yes
http://drs.nio.org/drs/handle/2264/5077
 
Language en
 
Relation J_Mar_Syst_165_103.jpg
 
Rights An edited version of this paper was published by Elsevier. Copyright [2016] Elsevier
 
Publisher Elsevier