CO2 effluxes from an urban tidal river flowing through two of the most populated and polluted cities of India.

CO2 effluxes from an urban tidal river flowing through two of the most populated and polluted cities of India. Environ Sci Pollut Res Int. 2020 May 24;: Authors: Chanda A, Das S, Bhattacharyya S, Akhand A, Das I, Samanta S, Choudhury SB, Hazra S Abstract Urbanized rivers flowing through polluted megacities receive substantial amount of carbon from domestic sewage and industrial effluents which can significantly alter the air-water CO2 flux rates. In this regard, we quantified the partial pressure of CO2 in the surface water (pCO2(water)), air-water CO2 fluxes, and associated biogeochemical parameters in the Hooghly River, India, flowing through two of the most polluted cities of the country, Kolkata and Howrah, over a complete annual cycle during spring tidal phase (SP) and neap tidal phase (NP). This urbanized part of Hooghly River was always supersaturated with CO2 having an annual mean pCO2(water) and air-water CO2 flux of ~ 3800 μatm and ~ 49 mol C m-2 year-1, respectively. Significant seasonal variability was observed for both pCO2(water) and air-water CO2 flux (pre-monsoon, 3038 ± 539 μatm and 5049 ± 964 μmol m-2 h-1; monsoon, 4609 ± 711 μatm and 7918 ± 1400 μmol m-2 h-1; post-monsoon, 2558 ± 258 μatm and 4048 ± 759 μmol m-2 h-1, respectively). Monthly mean pH and total alkalinity varied from 7.482 to 8.099 and from 2437 to 4136 μmol kg-1, respectively, over the annual cycle. pCO2(water) showed significant positiv...
Source: Environmental Science and Pollution Research International - Category: Environmental Health Authors: Tags: Environ Sci Pollut Res Int Source Type: research