Indian Journal of Geo-Marine Sciences

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Variation of Biogenic Sulphur Compounds in the Estuarine and Coastal Waters of Goa, West Coast of India


Affiliations
1 CSIR - National Institute of Oceanography, Chemical Oceanography Division, Dona Paula, Goa – 403 004, India
 

Dimethylsulphide (DMS) originates predominantly from dimethylsulphoniopropionate (DMSP), a metabolite produced by phytoplankton. Through its contribution to the production of new aerosols and cloud condensation nuclei, a high concentration of DMS has the potential to influence the radiation budget of the earth. Estuaries and coastal regions being dynamic may produce significantly high concentrations of DMS and DMSP. The present study aimed to investigate the spatial variation of DMS, its precursor total dimethylsulphoniopropionate (DMSPt), and its sink total dimethylsulphoxide (DMSOt) at 7 estuarine locations in 4 rivers and a coastal station in Goa during the North East Monsoon (NEM). Generally, higher concentrations of DMS and DMSPt were observed at the near mouth stations and the coastal station compared to upstream stations. Though a positive correlation was observed between salinity and DMSPt, it was not significant, indicating the involvement of other factors influencing DMSP and DMS concentrations. Diatoms were the most abundant group accounting for > 90 % of the phytoplankton. However, higher fractions of dinoflagellates, nano- and picoplankton probably contributed to the DMSPt, DMS and DMSOt production at the coastal and near mouth stations. As the wind speeds were low, DMS flux was governed by surface DMS concentrations and varied between 0.07 and 2.11 µmoles S m-2 D-1 with an average of 0.92±0.80 μmoles S m-2 D-1. In comparison to DMSPt and DMS, a relatively higher concentration of DMSOt was observed in the study area. While the high DMSOt concentration at the estuarine mouths may be attributed to the photo- or biological oxidation of DMS, those in the upper reaches point to an unknown source and warrants further investigation.

Keywords

Coast, DMS, DMSPt, DMSOt, Estuary, Phytoplankton, Salinity.
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  • Variation of Biogenic Sulphur Compounds in the Estuarine and Coastal Waters of Goa, West Coast of India

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Authors

S. G. Borker
CSIR - National Institute of Oceanography, Chemical Oceanography Division, Dona Paula, Goa – 403 004, India
D. M. Shenoy
CSIR - National Institute of Oceanography, Chemical Oceanography Division, Dona Paula, Goa – 403 004, India
K. F. Bepari
CSIR - National Institute of Oceanography, Chemical Oceanography Division, Dona Paula, Goa – 403 004, India
S. Kurian
CSIR - National Institute of Oceanography, Chemical Oceanography Division, Dona Paula, Goa – 403 004, India
H. Uskaikar
CSIR - National Institute of Oceanography, Chemical Oceanography Division, Dona Paula, Goa – 403 004, India

Abstract


Dimethylsulphide (DMS) originates predominantly from dimethylsulphoniopropionate (DMSP), a metabolite produced by phytoplankton. Through its contribution to the production of new aerosols and cloud condensation nuclei, a high concentration of DMS has the potential to influence the radiation budget of the earth. Estuaries and coastal regions being dynamic may produce significantly high concentrations of DMS and DMSP. The present study aimed to investigate the spatial variation of DMS, its precursor total dimethylsulphoniopropionate (DMSPt), and its sink total dimethylsulphoxide (DMSOt) at 7 estuarine locations in 4 rivers and a coastal station in Goa during the North East Monsoon (NEM). Generally, higher concentrations of DMS and DMSPt were observed at the near mouth stations and the coastal station compared to upstream stations. Though a positive correlation was observed between salinity and DMSPt, it was not significant, indicating the involvement of other factors influencing DMSP and DMS concentrations. Diatoms were the most abundant group accounting for > 90 % of the phytoplankton. However, higher fractions of dinoflagellates, nano- and picoplankton probably contributed to the DMSPt, DMS and DMSOt production at the coastal and near mouth stations. As the wind speeds were low, DMS flux was governed by surface DMS concentrations and varied between 0.07 and 2.11 µmoles S m-2 D-1 with an average of 0.92±0.80 μmoles S m-2 D-1. In comparison to DMSPt and DMS, a relatively higher concentration of DMSOt was observed in the study area. While the high DMSOt concentration at the estuarine mouths may be attributed to the photo- or biological oxidation of DMS, those in the upper reaches point to an unknown source and warrants further investigation.

Keywords


Coast, DMS, DMSPt, DMSOt, Estuary, Phytoplankton, Salinity.

References