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• W4206978035 startingPage "153296" @default.
• W4206978035 abstract "Rivers significantly contribute to the global carbon budget, but data limitations and uncertainty are hampered by CO2 quantification in the global rivers. Thus, this study estimated riverine pCO2 by employing the pH-alkalinity-temperature method, and dissolved inorganic (DIC), dissolved organic (DOC), particulate organic (POC) carbon, and their isotopes (δ13C) with Chlorophyll-a (Chl a) were measured in river water samples from 26 sampling sites for characterization and source identification in the Yangtze River system. The estimated pCO2 varies from (120 ppm) to (3400 ppm) with an average (1085 ppm) across the Yangtze River and pCO2 is almost three times oversaturated than the ambient air (380 ppm). The downstream sites pronounced elevated pCO2 than the upstream sites. The relationship of δ13CDIC and pCO2 indicated that pCO2 control is seasonally independent. The significant correlations between DOC, POC, and pCO2 revealed that organic carbon influenced pCO2 in the river. The seasonal fluctuations of pCO2 were observed with an average of (762.23 ppm) and (1407.35 ppm) in winter and summer, respectively. δ13CDIC showed that the metabolic process has a negligible influence on DIC, δ13CDIC, and pCO2. δ13CDIC values increased from -8.95‰ to -4.91‰ during summer, whereas winter increased from -19.76‰ to -1.97‰ suggesting that DIC derived from carbonate weathering, dissolution of atmospheric and soil CO2. The δ13CDOC (-30.43‰ to -24.05‰) and δ13CPOC (-29.87‰ to -23.37‰) values confirmed that organic carbon mainly derived from the degradation of organic materials in soil. δ13CDIC revealed that anthropogenic sewage discharge slightly modified DIC composition. Overall, this study provides new insight into recent seasonal fluctuations of the pCO2, DOC, POC, DIC, δ13C, and their inputs. Thus, these variations and inputs of carbon transported by the Yangtze River could have a significant influence not only on the biogeochemical cycle and ecosystem process but also on the global carbon budget." @default.
• W4206978035 created "2022-01-26" @default.
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• W4206978035 date "2022-05-01" @default.
• W4206978035 modified "2023-10-05" @default.
• W4206978035 title "Dynamic of riverine pCO2, biogeochemical characteristics, and carbon sources inferred from δ13C in a subtropical river system" @default.
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• W4206978035 doi "https://doi.org/10.1016/j.scitotenv.2022.153296" @default.
• W4206978035 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35074366" @default.
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