| In situ Raman-based measurements of high dissolved methane concentrations in hydrate-rich ocean sediments | |
| Zhang, Xin1,2; Hester, Keith C.1,3; Ussler, William1; Walz, Peter M.1; Peltzer, Edward T.1; Brewer, Peter G.1; Zhang, X (reprint author), Monterey Bay Aquarium Res Inst, 7700 Sandholdt Rd, Moss Landing, CA 95039 USA | |
| 2011-04-19 | |
| 发表期刊 | GEOPHYSICAL RESEARCH LETTERS
 |
| ISSN | 0094-8276 |
| 卷号 | 38页码:L08605 |
| 文章类型 | Article |
| 摘要 | Ocean sediment dissolved CH4 concentrations are of interest for possible climate-driven venting from sea floor hydrate decomposition, for supporting the large-scale microbial anaerobic oxidation of CH4 that holds the oceanic CH4 budget in balance, and for environmental issues of the oil and gas industry. Analyses of CH4 from recovered cores near vent locations typically show a maximum of similar to 1 mM, close to the 1 atmosphere equilibrium value. We show from novel in situ measurement with a Raman-based probe that geochemically coherent profiles of dissolved CH4 occur rising to 30 mM (pCH(4) = 3 MPa) or an excess pressure similar to 3x greater than CO2 in a bottle of champagne. Normalization of the CH4 Raman nu(1) peak to the ubiquitous water nu(2) bending peak provides a fundamental internal calibration. Very large losses of CH4 and fractions of other gases (CO2, H2S) must typically occur from recovered cores at gas rich sites. The new data are consistent with observations of microbial biomass and observed CH4 oxidation rates at hydrate rich sites and support estimates of a greatly expanded near surface oceanic pore water CH4 reservoir. Citation: Zhang, X., K. C. Hester, W. Ussler, P. M. Walz, E. T. Peltzer, and P. G. Brewer (2011), In situ Raman-based measurements of high dissolved methane concentrations in hydrate-rich ocean sediments, Geophys. Res. Lett., 38, L08605, doi: 10.1029/2011GL047141.; Ocean sediment dissolved CH(4) concentrations are of interest for possible climate-driven venting from sea floor hydrate decomposition, for supporting the large-scale microbial anaerobic oxidation of CH(4) that holds the oceanic CH(4) budget in balance, and for environmental issues of the oil and gas industry. Analyses of CH(4) from recovered cores near vent locations typically show a maximum of similar to 1 mM, close to the 1 atmosphere equilibrium value. We show from novel in situ measurement with a Raman-based probe that geochemically coherent profiles of dissolved CH(4) occur rising to 30 mM (pCH(4) = 3 MPa) or an excess pressure similar to 3x greater than CO(2) in a bottle of champagne. Normalization of the CH(4) Raman nu(1) peak to the ubiquitous water nu(2) bending peak provides a fundamental internal calibration. Very large losses of CH(4) and fractions of other gases (CO(2), H(2)S) must typically occur from recovered cores at gas rich sites. The new data are consistent with observations of microbial biomass and observed CH(4) oxidation rates at hydrate rich sites and support estimates of a greatly expanded near surface oceanic pore water CH(4) reservoir. Citation: Zhang, X., K. C. Hester, W. Ussler, P. M. Walz, E. T. Peltzer, and P. G. Brewer (2011), In situ Raman-based measurements of high dissolved methane concentrations in hydrate-rich ocean sediments, Geophys. Res. Lett., 38, L08605, doi: 10.1029/2011GL047141. |
| 学科领域 | Geology |
| DOI | 10.1029/2011GL047141 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000289854100006 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/11503 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Zhang, X (reprint author), Monterey Bay Aquarium Res Inst, 7700 Sandholdt Rd, Moss Landing, CA 95039 USA |
| 作者单位 | 1.Monterey Bay Aquarium Res Inst, Moss Landing, CA 95039 USA 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 3.ConocoPhillips Bartlesville Technol Ctr, Bartlesville, OK USA |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Zhang, Xin,Hester, Keith C.,Ussler, William,et al. In situ Raman-based measurements of high dissolved methane concentrations in hydrate-rich ocean sediments[J]. GEOPHYSICAL RESEARCH LETTERS,2011,38:L08605. |
| APA | Zhang, Xin.,Hester, Keith C..,Ussler, William.,Walz, Peter M..,Peltzer, Edward T..,...&Zhang, X .(2011).In situ Raman-based measurements of high dissolved methane concentrations in hydrate-rich ocean sediments.GEOPHYSICAL RESEARCH LETTERS,38,L08605. |
| MLA | Zhang, Xin,et al."In situ Raman-based measurements of high dissolved methane concentrations in hydrate-rich ocean sediments".GEOPHYSICAL RESEARCH LETTERS 38(2011):L08605. |
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