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Detection of methane plumes in the water column of Losatchev hydrothermal vent field, Mid-Atlantic Ridse

ISSN号：0253-4193
期刊名称：《海洋学报》
时间：0
分类：TE37[石油与天然气工程—油气田开发工程]
作者机构：[1]Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China, [2]Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China
相关基金：Supported by Key Project of the National Natural Science Foundation of China （Grant No. 40473032）, and the National Natural Science Foundation of China （Grant Nos. 40532011 and 40403004）;The authors wish to thank the chief scientists, captain, and crews of the R/V Da Yang Yi Hao in the cruise DYI05-17. Special thanks are due to Prof Lin Jian of the Woods Hole 0ceanographic Institution （WH0I）, Zhu Jian of Peking University and Zhou Peifeng of Second Institute of 0ceanology for providing the data of temperature and nephelometry.

作者： ZHOU HuaiYang[1], WU ZiJun[1,2], PENG XiaoTong[1], JIANG Lei[1], TANG Song[1]

关键词：甲烷, 浓度异常, 热气流, 层离法, Logachev vent field, hydrothermal plume, methane concentration anomalies

中文摘要：

在在 R/V 上的 DY105-17 巡航期间在 2005 的“达·杨·伊·豪”，在在 Logachev 上面的水列的甲烷集中热水发泄地被 applyingstripping/trapping-gaschromatographic (GC ) 测量，不同甲烷羽毛被检测。在 Logachev 区域以内的背景甲烷集中从 1.05 nmol/L 到 1.68nmol/L 的 Resultsshow，比大西洋的背景水平显著地高深渊 0.4--0.5nmol/L 的平原，建议那热水的发泄是到海洋的溶解甲烷的主要来源。在水列的甲烷集中的 Thehighest 异例从 7.14 nmol/L 到 113.9nmol/L 并且发生就 at180 -- 在海地板上面的 500 m。甲烷集中的分发和热水的羽毛的结构的特征被内在的热水的液体，海洋底部水流的混合过程和微生物引起的氧化的供应强烈影响。而且，在在 stationMAR-CTD3 和另外的车站之间的甲烷羽毛的分发的差别显示一可能未知热水高发泄地点 nearby.Thereoccurs 与温度和用悬液计测量悬液异例一起的甲烷的集中，它强烈证实在水列的甲烷集中的微妙的测量是定位热水的发泄的活性部位的有效方法之一。

英文摘要：

During DY105-17 cruise onboard the PJV ＂Da Yang Yi Hao＂ in 2005, methane concentrations in the water column above Logachev hydrothermal vent field were measured by applying stripping/trapping-gas chromatographic （GC） and the distinct methane plumes were detected. Results show that the background methane concentration within the Logachev area is from 1.05 nmol/L to 1.68 nmol/L, significantly higher than the background level of the Atlantic abyssal plain of 0.4-0.5 nmol/L, suggesting that hydrothermal venting is a major source of dissolved methane to the ocean. The highest anomalies of methane concentrations in the water column range from 7.14 nmol/L to 113.9 nmol/L and occur just at 180-500 m above the seafloor. The distribution of methane concentration and the structural characteristics of hydrothermal plumes are strongly influenced by the supply of underlying hydrothermal fluids, the mixing process of ocean bottom currents and the microbial oxidation. Furthermore, the differences in distribution of methane plume between the station MAR-CTD3 and the other stations indicate a probable unknown hydrothermal vent site nearby. There occurs high concentration of methane along with temperature and nephelometry anomalies, which strongly confirms that the subtle measurement of methane concentration in water column is one of the effective ways to locate active sites of hydrothermal venting.

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