Wu,W., Xu,S., Yang,J. and Yin,H.(2008): Silicate weathering and CO2 consumption deduced from the seven Chinese rivers originating in the Qinghai-Tibet Plateau. Chemical Geology, 249, 307-320.

『青海−チベット高原に源流をもつ７つの中国河川から推定された珪酸塩風化とCO2消費』

『Abstract
　We present river chemical data for the seven Chinese rivers (the Jinsha Jiang, Yalong Jiang, Min Jiang, Dadu He, Lancang Jiang, Nu Jiang and Huang He) originating in the Qinghai-Tibet Plateau. Our sampling locations are near sites where the seven ricers flow down the plateau. Water samples we recollected in both high-water periods (summer) and low-water periods (winter). Our study shows that most of the Ca, Mg and HCO3 in the seven rivers are derived from the carbonate weathering and only small fractions (10％) of the cations are derived from silicate weathering. The chemical erosion rates of silicate and carbonate range from 1.1 mm ka-1 to 3.4 mm ka-1 and from 7.5 mm ka-1 to 29.9 mm ka-1 respectively. The long term CO2 consumption by silicate weathering in the seven Chinese river basins ranges from 0.7×105 mol km-2 a-1 to 3.7×105 mol km-2 a-1. Based on our analysis of chemical data from the seven Chinese rivers and the previously published data of the Ganges, Brahmaputra and Indus, the main ten rivers originating in the Himalaya ad Qinghai-Tibet Plateau consume 328×109 mol a-1 of atmospheric CO2. This is only 3.8％ of the CO2 consumption derived from global silicate weathering (8700×109 mol a-1), indicating that the chemical weathering of the Himalaya and Qinghai-Tibet Plateau makes a very small contribution to the reduction of the global atmospheric CO2 concentration.

Keywords: Qinghai-Tibet Plateau; River; Continental weathering; Atmospheric CO2 consumption』

1. Introduction
2. Study areas and sampling locations
　2.1. The Jinsha Jiang
　2.2. The Lancang Jiang
　2.3. The Nu Jiang
　2.4. The Huang He
　2.5. The Yalong Jiang
　2.6. The Min Jiang
　2.7. The Dadu He
3. Sampling and analysis
4. Results and discussion
　4.1. Sources of major ions in the rivers
　　4.1.1. Atmospheric input and anthropogenic activity
　　4.1.2. Silicate weathering
　　4.1.3. Carbonates and evaporites
　4.2. Data comparison
　4.3. The weathering rates in the seven Chinese basins
　4.4. The CO2 consumption rate
　4.5. Worldwide comparison
5. Conclusions
Acknowledgements
References

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