Controls of dimethyl sulphide in the Bay of Bengal during BOBMEX-Pilot cruise 1998 |
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Authors: | D M Shenoy M Dileep Kumar V V S S Sarma |
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Institution: | (1) National Institute of Oceanography, 403004 Dona Paula, Goa, India;(2) CEREGE, Université d’Aix-Marseille III, Europole de l’Arbois, BP 80, 13545 Cedex 4, Aix En Provence, France |
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Abstract: | 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. |
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Keywords: | Dimethyl sulphide air-sea exchange BOBMEX Bay of Bengal aerosols |
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