Hydrochemistry of the middle and upper reaches of the Yarlung Tsangpo River system: weathering processes and CO2 consumption

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• 作者：Liguang Jiang ; Zhijun Yao ; Rui Wang ; Zhaofei Liu ; Lei Wang…
• 关键词：Yarlung Tsangpo ; Hydrochemistry ; Major ions ; Weathering processes ; CO2 consumption
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：74
• 期：3
• 页码：2369-2379
• 全文大小：1,547 KB
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• 作者单位：Liguang Jiang (1)
  Zhijun Yao (1)
  Rui Wang (1) (2)
  Zhaofei Liu (1)
  Lei Wang (1) (2)
  Shanshan Wu (1)
  
  1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A Datun Road, Chaoyang District, Beijing, 100101, China
  2. University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing, 100049, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

The study focuses on the chemical compositions of the river waters in the middle and upper reaches of the Yarlung Tsangpo river system. Samples were collected in two periods along the river system to analyze the spatio-temporal variation characteristics and to determine the weathering processes and CO2 consumption. The results show that the chemical facies of river waters are dominated by Ca-HCO3 type and the TDS values cover a wide range of 98.2-19.8?mg/l with an average value of 268.6?mg/l, which is higher than that of the global river waters. There are three major reservoirs (carbonates, evaporites, and silicates) contributing to the major ions, and the predominances of the reservoirs of different rivers show spatial heterogeneity. The chemical weathering rates of silicates and carbonates are 3.43 and 4.49?t/km2/year, respectively. Overall, the middle and upper reaches of Yarlung Tsangpo are responsible for 0.3 and 0.16?% of global atmospheric CO2 consumption by silicates (1.7?×?105?mol/km2/year) and carbonates (1.27?×?105?mol/km2/year), respectively. In addition, the chemical weathering fluxes of the catchments consume atmospheric CO2 of 0.5456?Tg C/year, accounting for 0.14?% of the total organic carbon flux to the oceans by rivers globally.