Sub-bottom methane hydrates off northeastern Sakhalin Island, Russia : Evaluation of methane flux by dissolved ions in the sediment pore waters

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  • サハリン北東沖の海底表層型メタンハイドレート : 間隙水中の溶存イオンによるメタンフラックス評価
  • サハリン ホクトウオキ ノ カイテイ ヒョウソウガタ メタンハイドレート : カンゲキ スイチュウ ノ ヨウゾンイオン ニ ヨル メタンフラックス ヒョウカ

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Abstract

The hydro-Carbon Hydrate Accumulations in the Okhotsk Sea project (CHAOS) and the Sakhalin Slope Gas Hydrate project (SSGH and SSGH II) are international collaborative research projects organized by scientists from Japanese, Russian and Korean research institutes to study natural methane hydrates (MHs) that have accumulated on the continental slope off Sakhalin Island, Russia. More than 20 MH-bearing sites have been newly-discovered by the retrieval of MH samples from the seafloor. Several hundred seepage sites/structures have been newly- discovered by the geophysical surveys during the field operations of the projects. The concentrations of sulfate ion as well as conservative ion such as chloride and sodium ion in the sediment pore waters were measured to investigate the concentration-depth profiles of these ions. The findings suggest that the methane flux from below has been varied (increased or decreased suddenly) presumably caused by the formation of MH adjacent to the core sampling sites.

Journal

  • 低温科学

    低温科学 74 153-161, 2016-03-31

    低温科学第74巻編集委員会

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