カメルーン・ニオス湖ガス災害に果たした湖の役割

DOI Web Site 被引用文献1件

書誌事項

タイトル別名
  • Outburst of carbon dioxide from Lake Nyos, Cameroon
  • カメルーン ニオスコ ガス サイガイ ニ ハタシタ ミズウミ ノ ヤクワリ

この論文をさがす

抄録

Outbursts of a large volume of carbon dioxide took place on 21 August 1986 at Lake Nyos, Cameroon, leading more than 1700 lives to death by asphyxiation. Geochemical and limnological survey made some 50 days after the disaster revealed that the lake water was still stratified with respect to temperature, chemistry and density except a very surface layer. The dissolved species were overwhelmingly dominated by CO2 (aq) and HCO3- with a substantial concentration of Fe2+ in deep waters. Stable isotopic compositions of carbon (δ13C=-3‰) and helium (5.7 times the atmospheric 3He/4He ratio) strongly indicate a mantle origin of the gases. Very low concentrations of Cl- and SO42- argue against the volcanic gas injection hypothesis as a cause of the disaster. The gas bursts were caused by outgassing of CO2-laden deep water which was displaced upward and effervesced near the surface, possibly triggered by an increased input rate of warmer, CO2-charged groundwater from the bottom during the rainy season.

収録刊行物

  • 地球化学

    地球化学 21 (2), 39-47, 1987

    一般社団法人日本地球化学会

被引用文献 (1)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ