A preliminary study on the inorganic carbon sink function of mineral weathering during sediment transport in the Yangtze River mainstream

被引：0
|
作者：
Zhang X. [1 ]
Luo J. [1 ,2 ]
Wang X. [1 ]
Tang J. [1 ]
Peng T. [3 ]
Zhu B. [1 ]
机构：
[1] Key Laboratory of Mountain Environment Evolution and Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Sichuan, Chengdu
[2] Faculty of Geosciences and Environmental Engineering, South-west Jiaotong University, Sichuan, Chengdu
[3] Puding Karst Ecosystem Observation and Research Station, Chinese Academy of Sciences, Puding, Guizhou
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 07期
关键词：
calcium and magnesium minerals; carbon sink; rock weathering; suspended sediment; transport; Yangtze River;
D O I：
10.19762/j.cnki.dizhixuebao.2022055
中图分类号：
学科分类号：
摘要：
This study proposed that the dissolution of calcium and magnesium minerals in river sediment could sequester C02 and function as a carbon sink. Based on the published literature, the contents of CaO, MgO, calcite and dolomite in suspended sediment collected from 25 sampling points in the mainstream and 13 sampling points in the tributaries of the Yangtze River in 4 sampling campaigns during 2003 - 2007 were used to calculate the total inorganic carbon sink (TCS) capacity and nonsubstantial and substantial inorganic carbon sink (NSCS and SCS) capacities of suspended sediment along the river. Results showed that the TCS, NSCS and SCS caused by weathering of Ca and Mg minerals at Cuntan-Datong section were 2. 57X107 tons, 1. 70X107 tons and 0. 87X107 tons per year during the period of 1956 - 2000. Due to the reduction of sediment yield, the annual TCS, NSCS and SCS of the Cuntan-Datong section during 2006 - 2019 decreased by 18. 52 X 10 tons, 12.24X10 tons and 8. 72 X 10 tons, respectively, compared to the period before 2002. The average annual sedimentation of the Three Gorges Reservoir (TGR) was 114. 5X 106 tons, and the related TCS loss was 6. 76X106 tons, which were equivalent to 7. 9% of the 85. 8X106 tons of C02 emissions reduced by the clean energy production of the Three Gorges Hydropower Station. The annual TCS of global rivers was estimated as 757 X 10 tons (the SCS was more than one quarter of the TCS), which is equivalent to 71. 6 % of the TCS by global rock weathering with 1. 06 X 10 tons of sequestered C02. The dissolution rate of calcium and magnesium minerals for offsite rock weathering was higher than that for in situ rock weathering. © 2023 Geological Society of China. All rights reserved.
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页码：2378 / 2385
页数：7
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