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Methane sources and sinks in the subtropical South Pacific along 17°S as traced by stable isotope ratiosOriginal Research Article
http://hdl.handle.net/10659/4268
http://hdl.handle.net/10659/4268dfd343f3-10e8-4ea4-b64a-a61a358a2010
名前 / ファイル | ライセンス | アクション |
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S-2015-6_yoshida.pdf (1.4 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2016-05-23 | |||||
タイトル | ||||||
タイトル | Methane sources and sinks in the subtropical South Pacific along 17°S as traced by stable isotope ratiosOriginal Research Article | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Stable isotopes | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Methane sources and sinks | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Marine methane flux | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Subtropical South Pacific | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Yoshikawa, Chisato
× Yoshikawa, Chisato× Hayashi, Elena× Yamada, Keita× Yoshida, Osamu× Toyoda, Sakae× Yoshida, Naohiro |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We analyzed the concentration and stable carbon isotopic ratio (δ^<13>C-CH_4) of methane in the atmosphere and in dissolved methane in water column along 17°S in the subtropical South Pacific. Additionally, the hydrogen isotopic ratios (δD-CH_4) of some water samples were analyzed. The sea–air CH_4 flux is high in the eastern region and off the west coast of Australia, which is related to the high concentrations of dissolved CH_4 and high wind speeds. Moreover, there is a positive correlation between the CH4 and chlorophyll a concentrations at the surface. This consistency suggested that active CH_4 productions related to the primary production cause surface CH_4 accumulation. CH_4 shows a decrease in concentration and an increase in δ^<13>C-CH_4 and δD-CH_4 values from the surface to the depth of about 1000 m. The relationship between δ^<13>C-CH_4 values and CH_4 concentration indicates that the isotopic enrichment of CH_4 reflects microbial oxidation of CH_4 with isotopic fractionation during vertical transport via vertical sinking and/or zooplankton migration. East of 120°W, δ^<13>C-CH_4 values at around 1000 m exceed − 30.0‰. The relationships among the δ^<13>C-CH_4 values, CH_4 concentrations, and oxygen concentrations indicate that the ^<13>C-enriched CH_4 originates not only from in situ CH_4 production and oxidation but also from CH_4 transported from the eastern margin off Peru. Furthermore, at a site near the Central Lau Spreading Centers in the Lau Basin, high δ^<13>C-CH_4 values (up to − 21.4‰) are observed in the benthic water, suggesting a hydrothermal field source. | |||||
書誌情報 |
Chemical Geology 巻 382, p. 24-31, 発行日 2014-08 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0009-2541 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1016/j.chemgeo.2014.05.024 | |||||
権利 | ||||||
権利情報 | © 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license | |||||
権利(URI) | ||||||
権利情報 | http://creativecommons.org/licenses/by-nc-nd/3.0/ | http://creativecommons.org/licenses/by-nc-nd/3.0/ | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
出版者 | ||||||
出版者 | Elsevier B.V. | |||||
資源タイプ | ||||||
内容記述タイプ | Other | |||||
内容記述 | Article |