Possible variation in methane flux caused by gas hydrate formation on the northeastern continental slope off Sakhalin Island, Russia |
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Authors: | Hirotsugu Minami Kazuya Tatsumi Akihiro Hachikubo Satoshi Yamashita Hirotoshi Sakagami Nobuo Takahashi Hitoshi Shoji Young Keun Jin Anatoly Obzhirov Nataliya Nikolaeva Alexander Derkachev |
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Affiliation: | 1. Kitami Institute of Technology, 165 Koen-cho, Kitami, Hokkaido, 090-8507, Japan 2. Korea Polar Research Institute, Songdo-dong Yeonsu-gu, Incheon, 406-840, South Korea 3. V.I. Il’ichev Pacific Oceanological Institute Far Eastern Branch, Russian Academy of Sciences, 43 Baltiyskaya Street, Vladivostok, 690041, Russia
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Abstract: | The Sakhalin Slope Gas Hydrate Project (SSGH) is an international collaborative effort by scientists from Japan, Korea, and Russia to investigate natural gas hydrates (GHs) that have accumulated on the continental slope off Sakhalin Island, Okhotsk Sea. From 2009 to 2011, field operations of the SSGH-09, -10, and -11 projects were conducted. GH-bearing and -free sediment cores were retrieved using steel hydro- and gravity corers. The concentrations of sulfate ions in sediment pore waters were measured to investigate sulfate concentration–depth profiles. Seventeen cores showed linear depth profiles of sulfate concentrations. In contrast, eight cores and two cores showed concave-up and -down profiles plausibly explained by sudden increase and decrease in methane flux from below, respectively, presumably caused by the formation of gas hydrate adjacent to the core sampling sites. |
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