Chemical weathering and long‐term CO<sub>2</sub> consumption in the Ayeyarwady and Mekong river basins in the Himalayas

DOI Web Site Web Site 被引用文献5件 参考文献28件
  • Takuya Manaka
    Atmosphere and Ocean Research Institute University of Tokyo Chiba Japan
  • Souya Otani
    Atmosphere and Ocean Research Institute University of Tokyo Chiba Japan
  • Akihiko Inamura
    Geological Survey of Japan National Institute of Advanced Industrial Science and Technology (AIST) Ibaraki Japan
  • Atsushi Suzuki
    Geological Survey of Japan National Institute of Advanced Industrial Science and Technology (AIST) Ibaraki Japan
  • Thura Aung
    Myanmar Earthquake Committee, Myanmar Engineering Society Yangon Myanmar
  • Raywadee Roachanakanan
    Faculty of Environment and Resource Studies Mahidol University Nakhon Pathom Thailand
  • Takeshige Ishiwa
    Atmosphere and Ocean Research Institute University of Tokyo Chiba Japan
  • Hodaka Kawahata
    Atmosphere and Ocean Research Institute University of Tokyo Chiba Japan

書誌事項

公開日
2015-06
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2015jg002932
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>The role of terrestrial river systems in the global carbon cycle on a long timescale has been a subject of interest, especially in the context of past climate changes such as the global cooling in the Cenozoic. The discharges of water and carbon into the ocean from the Himalayan watersheds are among the highest in the world. However, there are few reliable geochemical data from the Ayeyarwady River. This study focused on reevaluating chemical weathering in the Himalayan watersheds based on samples taken from the Ayeyarwady, Mekong, and Chao Phraya Rivers and on chemical analysis of the composition of dissolved substances in these rivers. Comparisons of water quality showed that, unlike in previous studies, the total alkalinity budgets of the Ayeyarwady are dominated by carbonate rather than silicate weathering. Long‐term CO<jats:sub>2</jats:sub> consumption by silicate weathering in the Ayeyarwady is estimated to be only 63–145 × 10<jats:sup>9</jats:sup> mol yr<jats:sup>−1</jats:sup>, which is only 10% of the previous estimate. Our results also suggest that the total Himalayan watersheds account for only about 10% of the total global CO<jats:sub>2</jats:sub> consumption by silicate weathering. Although we need further studies, chemical weathering and associated CO<jats:sub>2</jats:sub> uptake in the Himalayas likely played a lesser role in long‐term global cooling in the past than previously appreciated.</jats:p>

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