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Variability in abundance and fluxes of dimethyl sulphide in the Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Variability in abundance and fluxes of dimethyl sulphide in the Indian Ocean
 
Creator Shenoy, D.M.
DileepKumar, M.
 
Subject Indian Ocean
Dimethyl sulphide
 
Description Dimethyl sulphide (DMS) is a biogenic gas of climatic significance on which limited information is available from the Indian Ocean. To fill in this gap, we collected data on DMS and DMSPt (total dimethylsulphoniopropionate) by participating in a dozen cruises. Here, we discuss on the variability in DMS and DMSPt in the north and central Indian Ocean regions in terms of their spatial and temporal variation. DMS and DMSPt exhibited significant spatial and temporal variability. Apart from the concentration gradients in DMS within the Arabian Sea, Bay of Bengal and Central Indian Ocean basins, differences in average abundances were conspicuous between these basins. The Arabian Sea contained more DMS (mixed layer (MLD) averaged was 7.8 nM) followed by the Bay of Bengal (2.8 nM) and the Central Indian Ocean (2.7 nM). The highest concentrations of DMS and DMSPt (525 nM and 916 nM, respectively) were found in upwelling regimes along the west coast of India during the Southwest monsoon and fall intermonsoon seasons. Average surface DMS was the highest in the Arabian Sea. On the other hand observed sea-to air fluxes of DMS were higher in the Bay of Bengal due to the prevalence of turbulent conditions. In the Arabian Sea wind speeds were low and hence the sea-to-air fluxes. The total diffusive flux of DMS from the study area to atmosphere is estimated to be about 1.02 X 1012 g S y-1, which contributes to 4.1 - 6.3 % of the global DMS emission.
 
Date 2007-05-22T09:33:40Z
2007-05-22T09:33:40Z
2007
 
Type Journal Article
 
Identifier Biogeochemistry, vol.83(1-3), 277-292p.
http://drs.nio.org/drs/handle/2264/613
 
Language en
 
Rights An edited version of this paper was published by Springer. Copyright [2007] Springer
 
Format 797124 bytes
application/pdf
 
Publisher Springer