Hydrochemical origins and weathering-controlled CO2 consumption rates in the mainstream of the Yangtze River

ZHANG Hong; ZHOU Quanping; JIANG Yuehua; JIN Yang; YANG Guoqiang; GU Xuan; MEI Shijia; WANG Xiaolong

doi:10.16030/j.cnki.issn.1000-3665.202106027

2022 Vol. 49, No. 1

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ZHANG Hong, ZHOU Quanping, JIANG Yuehua, JIN Yang, YANG Guoqiang, GU Xuan, MEI Shijia, WANG Xiaolong. Hydrochemical origins and weathering-controlled CO2 consumption rates in the mainstream of the Yangtze River[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 30-40. doi: 10.16030/j.cnki.issn.1000-3665.202106027

Citation:

ZHANG Hong, ZHOU Quanping, JIANG Yuehua, JIN Yang, YANG Guoqiang, GU Xuan, MEI Shijia, WANG Xiaolong. Hydrochemical origins and weathering-controlled CO₂ consumption rates in the mainstream of the Yangtze River[J]. Hydrogeology & Engineering Geology, 2022, 49(1): 30-40. doi: 10.16030/j.cnki.issn.1000-3665.202106027

Hydrochemical origins and weathering-controlled CO₂ consumption rates in the mainstream of the Yangtze River

1.
Nanjing Center, China Geological Survey, Nanjing, Jiangsu　210016, China
2.
Key Laboratory of Watershed Eco-Geological Processes, Ministry of Natural Resources, Nanjing, Jiangsu　210016, China
3.
Graduate School of Chinese Academy of Geological Sciences, Beijing　100037, China
4.
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Science, Nanjing, Jiangsu　210008, China

More Information

Corresponding author: ZHOU Quanping, 18951757339@163.com

Received Date: 17 June 2021

Revised Date: 14 August 2021

Publish Date: 15 January 2022

Abstract

Abstract

Because river water in the Yangtze River watershed with a huge area is influenced by variable lithologies and large-scale water projects such as the Three Gorges Dam, the hydrochemical origins of the main stream are still controversial. Furthermore, previous estimations on the carbon sink in the watershed caused by mineral weathering are mostly based on the mass-balance calculations of cations, but this method generally involves the selection of parameters of various mineral end-members, which causes the uncertainty of results. In this study, the temporal and spatial evolutions of hydrochemistry of the main stream are determined, and a new method for the determination of CO₂ consumption rates during mineral weathering processes are proposed based on the mass-balance calculations of $\rm{HCO}_3^{-} $ < img text_id='' class='formula-img' style='display:none;' src='202106027_Z-20211103164316.png'/ > of the upper reaches. The results show that dissolution of evaporites, circulating salts, minerals weathering and sulfate dissolution are the main hydrogeochemical reactions controlling the ionic compositions of river water of the mainstream of the Yangtze River, while human activities mainly control the contents of $\rm{NO}_3^{-} $ < img text_id='' class='formula-img' style='display:none;' src='202106027_Z-20211103164348.png'/ > in the river water within 3000 km from the estuary. The CO₂ consumption rates of silicate weathering and carbonate weathering in the upper reaches of the Yangtze River are 1.16×10⁵ mol/(km²·a) and 4.75×10⁵ mol/(km²·a), respectively. This study may provide a better understanding of the major hydrochemical processes, enriches and promotes the theory of carbon cycle.
- mainstream of the Yangtze River /
- Three Gorges Dam (TGD) /
- multivariate statistical analysis /
- hydrochemical origin /
- CO₂ consumption

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References

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