Seasonality in carbon chemistry of Cochin backwaters

Pranav, P and Roy, Rajdeep and Chiranjivi, Jayaram and D’Costa, Priya M and Choudhury, Saroj Bandhu and Menon, Nandini and Nagamani, P V and Sathyendranath, Shubha and Abdulaziz, Anas and Shesha Sai, M V R and Sajhunneesa, T and George, Grinson (2021) Seasonality in carbon chemistry of Cochin backwaters. Regional Studies in Marine Science. pp. 1-28.

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Abstract

Seasonality in carbon chemistry of Cochin backwaters, Southern India, was investigated between 2018 and 2019. Dissolved inorganic carbon (DIC) showed strong seasonal variations. Lowest DIC was observed during the Southwest Monsoon (SWM), in conjunction with low salinity in surface waters, suggesting strong freshwater influence. The maximum concentration of partial pressure of carbon dioxide in water (pCO 2w) was recorded from polluted waters of Vembanad Lake (16,000 atm). Excluding the SWM, the inner most stations (freshwater) showed lower pCO 2w levels compared with the outermost (estuarine) ones. With regard to sampling stations, all the environmental properties, except silicate and phosphate, exhibited significant variation, pointing to large spatial heterogeneity across the stations. Redundancy analysis suggested salinity to be inversely related to surface pCO 2w. High pH and low pCO 2w observed in some of the inner most stations indicates role of pH in carbonate speciation. Our study indicates large seasonal fluctuation in biogeochemical parameters and strong heterogeneity between individual stations which therefore necessitates development of local biogeochemical models for better understanding of carbon budget in these waters.

Item Type:	Article
Uncontrolled Keywords:	Vembanad Lake; carbon dioxide; Cochin; Dissolved Inorganic Carbon; Monsoon
Subjects:	Oceanography Oceanography > Hydrology Oceanography > Seawater study Marine Environment
Divisions:	CMFRI-Kochi > Marine Capture > Fishery Resources Assessment Division Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Fishery Resources Assessment Division CMFRI-Kochi > Marine Capture > Fishery Resources Assessment Division Subject Area > CMFRI-Kochi > Marine Capture > Fishery Resources Assessment Division
Depositing User:	Arun Surendran
Date Deposited:	16 Jun 2021 06:15
Last Modified:	16 Jun 2021 06:15
URI:	http://eprints.cmfri.org.in/id/eprint/15144

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