Indian Journal of Geo-Marine Sciences

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Observations on Physico-Chemical Variability of Seawater along Tamil Nadu Coast, India Onboard CRV Sagar Purvi


Affiliations
1 Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, Tamil Nadu – 608 502, India
2 Marine Ecosystem Division, BPSG/EPSA, Space Applications Centre (ISRO) Ahmedabad – 380 015, India

Parameters that define the environmental variables, such as, phytoplankton biomass, chl-a, and nutrient concentration have been studied and analyzed during July 2017. During this study, vertical distribution of physico-chemical and water quality parameters has also been analyzed. Decrease in water temperature and dissolved oxygen from the surface to deep water up to the thermocline and oxycline were observed, which would be in relation to oxygen minimum zone. At the depth of 100 m, the concentration of chl-a is found high as compared to the surface water. The estimation of deep chlorophyll maximum has been chosen as a major investigation in this study. Moderate and high chl-a concentration (0.5-2.8 mg m-3) regardless of less NO3 flux (0.01-0.6 μM) have been recorded through in-situ and satellite observations. The concentration of SiO4 (5-35 μM) is likely enhanced in the vertical and surface water productivity. Principal component analysis and multiple linear regressions were carried out in order to determine the difference of the variables between the surface and deep water.
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  • Observations on Physico-Chemical Variability of Seawater along Tamil Nadu Coast, India Onboard CRV Sagar Purvi

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Authors

K. Priyanka
Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, Tamil Nadu – 608 502, India
R. K. Sarangi
Marine Ecosystem Division, BPSG/EPSA, Space Applications Centre (ISRO) Ahmedabad – 380 015, India
A. Saravanakumar
Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, Tamil Nadu – 608 502, India
G. Suthagar
Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, Tamil Nadu – 608 502, India
D. Poornima
Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, Tamil Nadu – 608 502, India

Abstract


Parameters that define the environmental variables, such as, phytoplankton biomass, chl-a, and nutrient concentration have been studied and analyzed during July 2017. During this study, vertical distribution of physico-chemical and water quality parameters has also been analyzed. Decrease in water temperature and dissolved oxygen from the surface to deep water up to the thermocline and oxycline were observed, which would be in relation to oxygen minimum zone. At the depth of 100 m, the concentration of chl-a is found high as compared to the surface water. The estimation of deep chlorophyll maximum has been chosen as a major investigation in this study. Moderate and high chl-a concentration (0.5-2.8 mg m-3) regardless of less NO3 flux (0.01-0.6 μM) have been recorded through in-situ and satellite observations. The concentration of SiO4 (5-35 μM) is likely enhanced in the vertical and surface water productivity. Principal component analysis and multiple linear regressions were carried out in order to determine the difference of the variables between the surface and deep water.