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• W3145588335 abstract "Carbon sequestration resulting from carbonate rock weathering is closely linked to the global carbon cycle and has turned out to be important in the adjustment of atmospheric CO2 levels. Traditional karst dynamic models based on water-rock-gas interactions underestimate carbon sink fluxes related to carbonate rock weathering because they ignore the utilization of dissolved inorganic carbon (DIC) by aquatic organisms. In this study, a new model based on water-rock-gas-organism interactions was applied in the Pearl River basin, China, to recalculate atmospheric CO2 consumption and to develop an accurate estimation model for carbon sink fluxes at catchment scale. Stable carbon isotope (d 13 C) and C/N ratios were used in the counting processes. Data were collected from published literature as well as through field investigation and labo- ratory analysis. Results show that the Pearl River carbon sink in the Pearl River is 4.31 9 10 9 kg/a, i.e., 15.8 9 10 9 kg of atmospheric CO2 per year. Of this, the carbon sink resulting from carbonate rock weathering amounts to 2.14 9 10 9 kg/a, i.e., 49.7 % of the total. The three largest tributaries of Pearl River, Dongjiang, Beijiang, and Xiji- ang, respectively absorb 0.5 9 10 9 , 1.19 9 10 9 , and 2.62 9 10 9 kg of carbon from the atmosphere annually, accounting for 12, 28 and 60 % of the river's total carbon sink. When compared with the results of previous resear- ches that disregarded the role of aquatic organisms, the new calculation method provides a carbon sink flux value that is 1.2-3.3 times higher, and 1.6 times higher on an average. To improve the calculation accuracy of atmo- spheric CO2 consumption in global karstic rivers, further research is needed regarding carbon sequestration mecha- nisms that involve aquatic organisms." @default.
• W3145588335 created "2021-04-13" @default.
• W3145588335 creator A5075215497 @default.
• W3145588335 date "2015-01-01" @default.
• W3145588335 modified "2023-09-27" @default.
• W3145588335 title "Estimation of carbon sink fluxes in the Pearl River basin (China) based on a water-rock-gas-organism interaction model" @default.
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• W3145588335 hasPublicationYear "2015" @default.
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