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Controls of dimethyl sulphide in the Bay of Bengal during BOBMEX-Pilot cruise 1998

DRS at CSIR-National Institute of Oceanography

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Title Controls of dimethyl sulphide in the Bay of Bengal during BOBMEX-Pilot cruise 1998
 
Creator Shenoy, D.M.
DileepKumar, M.
Sarma, V.V.S.S.
 
Subject greenhouse effect
tmospheric heat budget
 
Description The air-sea exchange is one of the main mechanisms maintaining the abundances of trace gases in the atmosphere. Some of these, such as carbon dioxide and dimethyl sulphide (DMS), will have a bearing on the atmospheric heat budget. While the former facilitates the trapping of radiation (greenhouse effect) the latter works in the opposite direction through reflectance of radiation back into space by sulphate aerosols that form from oxidation of DMS in atmosphere. Here we report on the first measurements made on DMS in the Bay of Bengal and the factors regulating its abundance in seawater. Phytoplankton alone does not seem to control the extent of DMS concentrations. We find that changes in salinity could effectively regulate the extent of DMSP production by marine phytoplankton. In addition, we provide the first ever evidence to the occurrence of DMS precursor, DMSP, in marine aerosols collected in the boundary layer. This suggests that the marine aerosol transport of DMSP will supplement DMS gaseous evasion in maintaining the atmospheric non-sea salt sulphur budget.
 
Date 2006-09-04T04:55:00Z
2006-09-04T04:55:00Z
2000
 
Type Journal Article
 
Identifier Proc. Indian Acad. Sci. (Earth Planet. Sci.), vol.109(2), 279-283p.
http://drs.nio.org/drs/handle/2264/360
 
Language en
 
Format 121864 bytes
application/pdf
 
Publisher Indian Academy of Sciences