Production of dimethylsulphide during the seasonal anoxia off Goa

Subsurface waters over the western Indian continental shelf experience seasonal anoxia towards the end of the southwest monsoon season. During a 3-day study carried out at the Candolim time series site (off the coast of Goa), dimethylsulphide (DMS) concentrations showed a 40-fold increase to a maxim...

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Bibliographic Details
Published in:	Biogeochemistry Vol. 110; no. 1/3; pp. 47 - 55
Main Authors:	Shenoy, Damodar M., Sujith, K. B., Gauns, Mangesh U., Patil, Shrikant, Sarkar, Amit, Naik, Hema, Narvekar, P. V., Naqvi, S. W. A.
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Dordrecht Springer 01-09-2012 Springer Netherlands Springer Nature B.V
Subjects:	Animal and plant ecology Animal, plant and microbial ecology Anoxia Anoxic conditions Biogeochemistry Biogeosciences Biological and medical sciences Biomass Chlorophylls Continental shelves Diatoms Earth and Environmental Science Earth Sciences Earth, ocean, space Ecosystems Environmental Chemistry Exact sciences and technology External geophysics Fundamental and applied biological sciences. Psychology Geochemistry Hydrogen sulfide Life Sciences Marine Metabolites Mineralogy Oxygen Physical and chemical properties of sea water Physics of the oceans Phytoplankton Plankton Sea water Sea water ecosystems Seas Seasons Sediments Silicates Slurries Sulfide compounds Surface water Synecology Water geochemistry Wind Arabian Sea Indian Ocean Goa India Asia India Arabian Sea Anoxia DMS DMSO DMSP experimental studies continental shelf hydrogen anoxic events hydrochemistry carbon phytoplankton sulfur plankton sulfides sea water dimethyl sulfide geochemical cycle accumulation chlorophyll concentration carbon cycle subsurface surface water depth marine environment monsoons seasonal variations
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Summary:	Subsurface waters over the western Indian continental shelf experience seasonal anoxia towards the end of the southwest monsoon season. During a 3-day study carried out at the Candolim time series site (off the coast of Goa), dimethylsulphide (DMS) concentrations showed a 40-fold increase to a maximum of 442 nM at 25 m depth compared to the oxygenated surface waters. This extremely high DMS was found to be associated with relatively low chlorophyll a, low phytoplankton cell counts and a high concentration of hydrogen sulphide. However, total dimethylsulphoniopropionate, total dimethylsulphoxide and methanethiol concentrations were quite low and unlikely to account for the DMS build-up through presently known pathways of DMS production. While there are several possible mechanisms for the observed accumulation of DMS, we were unable to pinpoint the exact pathway of DMS production. Future work will involve investigation of the source of DMS through sediment slurry experiments, to explore this interesting link between the carbon and sulphur cycles under anoxic conditions.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0168-2563 1573-515X
DOI:	10.1007/s10533-012-9720-5