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| Yanagawa, Katsunori; Tani, Atsushi; Yamamoto, Naoya; Hachikubo, Akihiro; Kano, Akihiro; Matsumoto, Ryo; Suzuki, Yohey. |
| The biological flux and lifetime of methanol in anoxic marine sediments are largely unknown. We herein reported, for the first time, quantitative methanol removal rates in subsurface sediments. Anaerobic incubation experiments with radiotracers showed high rates of microbial methanol consumption. Notably, methanol oxidation to CO2 surpassed methanol assimilation and methanogenesis from CO2/H2 and methanol. Nevertheless, a significant decrease in methanol was not observed after the incubation, and this was attributed to the microbial production of methanol in parallel with its consumption. These results suggest that microbial reactions play an important role in the sources and sinks of methanol in subseafloor sediments. |
| Tipo: Text |
Palavras-chave: Methanol consumption; Methanol production; Marine sediment. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00342/45319/44777.pdf |
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| Hachikubo, Akihiro; Yanagawa, Katsunori; Tomaru, Hitoshi; Lu, Hailong; Matsumoto, Ryo. |
| Hydrate-bearing sediment cores were retrieved from the Joetsu Basin (off Joetsu city, Niigata Prefecture) at the eastern margin of the Japan Sea during the MD179 gas hydrates cruise onboard R/V Marion Dufresne in June 2010. We measured molecular and stable isotope compositions of volatiles bound in the gas hydrates and headspace gases obtained from sediments to clarify how the minor components of hydrocarbons affects to gas hydrate crystals. The hydrate-bound hydrocarbons at Umitaka Spur (southwestern Joetsu Basin) primarily consisted of thermogenic methane, whereas those at Joetsu Knoll (northwestern Joetsu Basin, about 15 km from Umitaka Spur) contained both thermogenic methane and a mixture of thermogenic and microbial methane. The depth concentration... |
| Tipo: Text |
Palavras-chave: Gas hydrate; Japan Sea; Stable isotope; Neopentane; Biodegradation. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00294/40493/39284.pdf |
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