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Submarine groundwater discharge in estuaries and coastal waters is a significant factor of inorganic carbon dynamics and partial pressure of CO2 in water [pCO2] in estuaries and coastal waters worldwide. We did coupled radon and pCO2 investigations of groundwater and surface waters in two major tropical estuaries in India, the Hooghly and Matla estuaries, to investigate the causes of pCO2 dynamics. Our finding that total alkalinity and dissolved inorganic carbon were also higher in the groundwater than in the estuarine surface waters indicates a significant contribution of SGD to the estuary's inorganic carbon dynamics. This research will contribute to efforts to increase regional-scale coastal carbon budgets to a global level by contributing to an improved understanding of SGD's role in inorganic carbon cycling in tropical estuaries and coastal oceans.
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