Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-109 Manuscript under review for journal Biogeosciences Discussion started: 20 March 2018 c Author(s) 2018. CC BY 4.0 License. 1 Geochemistry of the dissolved loads of rivers in Southeast Coastal Region, China: 2 Anthropogenic impact on chemical weathering and carbon sequestration 3 Wenjing Liu1,2,3, Zhifang Xu1,2,3*, Huiguo Sun1,2,3, Tong Zhao1,2,3, Chao Shi1,2, Taoze Liu4 4 1 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and 5 Geophysics, Chinese Academy of Sciences, Beijing 100029, China 6 2 Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China 7 3 University of Chinese Academy of Sciences, Beijing 100049, China 8 4 State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese 9 Academy of Sciences, Guiyang, Guizhou 550002, China 10 * Corresponding author.
[email protected] (Zhifang Xu, Tel: +86 10 82998289) 1 Biogeosciences Discuss., https://doi.org/10.5194/bg-2018-109 Manuscript under review for journal Biogeosciences Discussion started: 20 March 2018 c Author(s) 2018. CC BY 4.0 License. 11 Abstract: 12 Southeast coastal region is the most developed and populated area in China. 13 Meanwhile, it has been the most severe acid rain impacted region for many years. The 14 chemical compositions and carbon isotope ratio of dissolved inorganic carbon 13 15 (δ CDIC) of rivers were investigated to evaluate the chemical weathering and 16 associated atmospheric CO2 consumption rates. Mass balance calculation indicated 17 that the dissolved loads of major rivers in the Southeast Coastal Rivers Basin 18 (SECRB) were contributed by atmospheric (14.4%, 6.6-23.4%), anthropogenic 19 (17.8%, 0-55.2%), silicate weathering (38.3%, 10.7-74.0%) and carbonate weathering 20 inputs (29.4%, 3.9-62.0%).