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Effect of vertical stability and circulation on the depth of the chlorophyll maximum in the Bay of Bengal during May-June, 1996

DRS at CSIR-National Institute of Oceanography

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Title Effect of vertical stability and circulation on the depth of the chlorophyll maximum in the Bay of Bengal during May-June, 1996
 
Creator Murty, V.S.N.
Gupta, G.V.M.
Sarma, V.V.
Rao, B.P.
Jyothi, D.
Shastri, P.N.M.
Supraveena, Y.
 
Subject salinity data
temperature data
gyres
water circulation
chlorphylls
vertical stability
 
Description A two-gyre circulation system consisting of an anticyclonic gyre (ACG) in the northwestern Bay of Bengal and a cyclonic gyre (CG) west of the Andaman Islands is shown by the hydrographic data collected during May-June, prior to the southwest monsoon of 1996. This circulation system leads to an intense southwestward flow in the central Bay. The circulation pattern characterizes the transition from the pre-monsoon (spring season) ACG to the southwest monsoon CG. A deep chlorophyll maximum (DCM) is found in the depth range 30-50 m in the coastal region and 50-100 m in the open sea. The DCM is located below the surface mixed layer, in the oxycline and nutricline, and above the seasonal thermocline/pycnocline, which coincides with the deep stability maximum (DSM). In the ACG, the DCM is located at 100 m when DSM is at 140 m deep, whereas in the CG, the DCM and DSM rise to 50 and 80 m, respectively. The magnitude of the chlorophyll maximum (CMAX) is nearly twice as high in the CG zone as in the ACG zone. The depths of both DCM and DSM, however, are twice as large in the ACG zone as in the CG zone. This shows that the meso-scale circulation patterns affect the spatial distribution of chlorophyll a (both DCM and CMAX) in the Bay of Bengal
 
Date 2009-01-09T09:22:24Z
2009-01-09T09:22:24Z
2000
 
Type Journal Article
 
Identifier Deep-Sea Research (I: Oceanographic Research Papers), Vol.47; 859-873p.
http://drs.nio.org/drs/handle/2264/1720
 
Language en
 
Rights Copyright [2000]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Pergamon