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| Abstract Submission No. | ABS-2022-05-0122 |
| Title of Abstract | Monsoonal distribution of DMS, DMSP and DMSO in the eastern Arabian sea |
| Authors | Sidhesh G. Borker*, Damodar M. Shenoy, Bhagyashri R. Naik, Kausar F. Bepari, Mangesh U. Gauns |
| Organisation | CSIR -National Institute of Oceanography |
| Address | vidyanagar, gogal Margao, Goa, India Pincode: 403601 Mobile: 8975969162 E-mail: borkersiddesh5@gmail.com |
| Country | India |
| Presentation | Poster |
| Abstract | Dimethylsulphide (DMS) is an organosulphur compound produced in the surface layer of the ocean. It is formed from its precursor Dimethylsulphinopropionate (DMSP), an osmolyte found in phytoplankton cells and on escape into the atmosphere it participates in the radiation balance of the earth system. Distribution of DMS, total dimethylsulphoniopropionate (DMSPt) and total dimethylsulphoxide (DMSOt) was studied along a north-south transect in the eastern Arabian Sea (8-21°N; 68°E) during the summer monsoons (SM; September) of 2014, 2016 and 2017 and the winter monsoon (WM; February) of 2017. The study was restricted to the upper euphotic zone (150 m) of the water column. DMS and associated compounds were measured using a Shimadzu gas chromatograph following the purge and trap technique. Concentrations of DMS and DMSPt showed significant seasonal and inter-annual variation. Maximum concentrations were observed during the SM of 2017 followed by SM of 2016, WM of 2017 with the lowest concentrations observed during the SM of 2014. Phytoplankton biomass also followed a similar trend during the study period. The mean concentrations of DMS, DMSPt and DMSOt during summer monsoon are 10.68±25 nM, 10.11±20 nM and 16.42±10 nM, respectively, and those in winter monsoon are 2.22±10, 9.44±15 and 14.43±20 nM, respectively. The work focuses on how nutrients input into the surface layers during the SM and WM influences phytoplankton distribution, DMS and DMSPt in the eastern Arabian Sea. |