中国地理科学(英文版) ›› 2005, Vol. 15 ›› Issue (1): 16-21.

• 论文 • 上一篇    下一篇

CHEMICAL WEATHERING PROCESSES AND ATMOSPHERIC CO2 CONSUMPTION OF HUANGHE RIVER AND CHANGJIANG RIVER BASINS

LI Jing-ying1, ZHANG Jing2,3   

  1. 1. School of Materials and Environmental Sciences, Qingdao University of Science & Technology, Qingdao 266042, P. R. China;
    2. Chemistry and Chemical Engineering College, Ocean University of China, Qingdao 266003, P. R. China;
    3. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, P. R. China
  • 收稿日期:2004-10-25 出版日期:2005-03-20 发布日期:2011-12-15
  • 作者简介:LI Jing-ying(1974- ),female,a native of Xinye of Henan Province,Ph.D.,associate professor,specialized in environ-mental geochemistry.E-mail:wxx1jy2001@public.qd.sd.cn.
  • 基金资助:

    Undertheauspicesof Ministry of Science and Technology Project of China(No.G1999043075)

CHEMICAL WEATHERING PROCESSES AND ATMOSPHERIC CO2 CONSUMPTION OF HUANGHE RIVER AND CHANGJIANG RIVER BASINS

LI Jing-ying1, ZHANG Jing2,3   

  1. 1. School of Materials and Environmental Sciences, Qingdao University of Science & Technology, Qingdao 266042, P. R. China;
    2. Chemistry and Chemical Engineering College, Ocean University of China, Qingdao 266003, P. R. China;
    3. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, P. R. China
  • Received:2004-10-25 Online:2005-03-20 Published:2011-12-15

摘要:

Rock weathering plays an important role in studying the long-term carbon cycles and global climatic change. According to the statistics analysis, the Huanghe(Yellow)River water chemistry was mainly controlled by evaporite and carbonate weathering, which were responsible for over 90% of total dissolved ions. As compared with the Huanghe River basin, dissolved load of the Changjiang(Yangtze)River was mainly originated from the carbonate dissolution. The chemical weathering rates were estimated to be 39.29 t/(km2·a)and 61.58 t/(km2·a)by deducting the HCO3- derived from atmosphere in the Huanghe River and Changjiang River watersheds, respectively. The CO2 consumption rates by rock weathering were calculated to be 120.84×103 mol/km2 and 452.46×103 mol/km2 annually in the two basins, respectively. The total CO2 consumption of the two basins amounted to 918.51×109 mol/a, accounting for 3.83% of the world gross. In contrast to other world watersheds, the stronger evaporite reaction and infirm silicate weathering can explain such feature that CO2 consumption rates were lower than a global average, suggesting that the sequential weathering may be go on in the two Chinese drainage basins.

关键词: Huanghe River basin, Changjiang River basin, chemical weathering rate, CO2 consumption

Abstract:

Rock weathering plays an important role in studying the long-term carbon cycles and global climatic change. According to the statistics analysis, the Huanghe(Yellow)River water chemistry was mainly controlled by evaporite and carbonate weathering, which were responsible for over 90% of total dissolved ions. As compared with the Huanghe River basin, dissolved load of the Changjiang(Yangtze)River was mainly originated from the carbonate dissolution. The chemical weathering rates were estimated to be 39.29 t/(km2·a)and 61.58 t/(km2·a)by deducting the HCO3- derived from atmosphere in the Huanghe River and Changjiang River watersheds, respectively. The CO2 consumption rates by rock weathering were calculated to be 120.84×103 mol/km2 and 452.46×103 mol/km2 annually in the two basins, respectively. The total CO2 consumption of the two basins amounted to 918.51×109 mol/a, accounting for 3.83% of the world gross. In contrast to other world watersheds, the stronger evaporite reaction and infirm silicate weathering can explain such feature that CO2 consumption rates were lower than a global average, suggesting that the sequential weathering may be go on in the two Chinese drainage basins.

Key words: Huanghe River basin, Changjiang River basin, chemical weathering rate, CO2 consumption

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