Atmospheric Co2 Sink: Silicate Weathering or Carbonate Weathering
详细信息
- 责任者：Liu Zaihua (State Key Laboratory of Environmental Geochemistry ; Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang550002 ; China) ; Dreybrodt ; W.
- 刊名：Quaternary Sciences
- 出版年：2011
- 卷期：31(3)
- 关键词：化学风化作用 ; chemical weathering ; 碳循环 ; carbon cycle
- 页码：p.426-430
- 图表：2 illus., 30 refs.
- 分类号：1800
- issnNo：ISSN1001-7410
- isbnNo：CN11-2708/P
摘要
In this paper, the authors show that the rapid kinetics of carbonate dissolution and the importance of small amounts of carbonate minerals in controlling the dissolved inorganic carbon (DIC) of silicate watersheds coupled with aquatic photosynthetic uptake of the weathering-related DIC and burial of the resulting organic carbon suggest that the atmospheric CO2 sink by carbonate weathering may previously have been greatly underestimated with a factor of about 3 amounting to 0.477 Pg C/a. This indicates that the contribution of silicate weathering to atmospheric CO2 sink may be only 6 ％ while the other 94 ％ is by carbonate weathering.