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Spatial variations of DMS, DMSP and phytoplankton in the Bay of Bengal during the summer monsoon 2001

DRS at CSIR-National Institute of Oceanography

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Title Spatial variations of DMS, DMSP and phytoplankton in the Bay of Bengal during the summer monsoon 2001
 
Creator Shenoy, D.M.
Paul, J.T.
Gauns, M.
Ramaiah, N.
DileepKumar, M.
 
Subject Bay of Bengal
phytoplankton abundance
 
Description Data on the distribution of Dimethylsulphide (DMS) and dimethylsulphoniopropionate (DMSP) in relation to phytoplankton abundance in different oceanic environments is important to understand the biogeochemistry of DMS, which plays an important role in the radiation balance of the earth. During the summer monsoon of 2001 measurements were made for DMS and DMSPt (total DMSP) together with related biological parameters in the Bay of Bengal. Both DMS and DMSPt were restricted to the upper 40 m of the water column. Diatoms accounted for more than 95% of the phytoplankton and were the major contributors to the DMS and DMSPt pool. The mean concentration of DMS in the upper 40 m was observed to be around 1.8 ± 1.9 nM in the study area, while DMSPt concentrations varied between 0.7 nM and 40.2 nM with a mean of 10.4 ± 8.2 nM. The observed lower DMSPt in the northern Bay in spite of higher mean primary productivity, chlorophyll a and phytoplankton cell counts seemed to result from grazing. Though salinity divides the Bay into different biogeochemical provinces there is no relation between salinity and DMS or DMSPt. On the other hand DMS was linearly related to chlorophyll a : phaeopigments ratio. The results suggest the need for deeper insight into the role of diatoms in the biogeochemical cycling of DMS.
 
Date 2006-07-14T11:35:23Z
2006-07-14T11:35:23Z
2006
 
Type Journal Article
 
Identifier Marine Environmental Research, vol.62(2), 83–97pp.
http://drs.nio.org/drs/handle/2264/216
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2006] Elsevier
 
Format 354719 bytes
application/pdf
 
Publisher Elsevier