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学科主题: Geology ; Meteorology & Atmospheric Sciences ; Oceanography
题名: Temporal Variation in Natural Gas Seep Rate and Influence Factors in the Lingtou Promontory Seep Field of the Northern South China Sea
作者: Di, PF ; Feng, D ; Chen, DF
通讯作者: cdf@gig.ac.cn
关键词: Hydrocarbon seep ; Methane flux ; Time series ; Tidal effect pore activation ; South China Sea
刊名: TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
发表日期: 2014
卷: 25, 期:5, 页:665-672
收录类别: sci
部门归属: [Di, Pengfei ; Feng, Dong ; Chen, Duofu] Chinese Acad Sci, Key Lab Marginal Sea Geol, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China ; [Chen, Duofu] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China ; [Di, Pengfei ; Chen, Duofu] Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Sanya, Peoples R China
项目归属: 海洋地质
资助者: National Natural Scientific Foundation of China [41306045, 91228206]; Knowledge Innovation Project of the Chinese Academy of Sciences [SQ201110]; "Hundred Talents Program" of CAS; Key Laboratory of Renewable Energy and Gas Hydrate, Chinese Academy of Sciences [y207k11001]
摘要: Natural hydrocarbon seeps in marine environment are important sources of methane and other greenhouse gases into the ocean and the atmosphere. This greenhouse gas seepage influences the global methane budget and global climate change. Hydrocarbon seeps on the shallow seabed produce a near-shore gas bubble zone along the western coast of Hainan Island, in the northern South China Sea. However, few studies on the quantitative value of the methane flux and on temporal variation and influence factors of hydrocarbon seeps have been conducted until now. This study describes the results of continuous gas vent measurements for 420 hours on the seabed of the Lingtou promontory shore. The amount of gas released from a single gas vent was 30.5 m(3) during the measurement period. The gas flow rate ranged from 22 - 72 L h(-1), with an average rate of 53.4 L h(-1). The time series analyses of the 420-hour record clearly show three principal tidal components with periods of 5.4, 4.6, and 2.4 hours, which are the main factors controlling the gas flow rate. Low flow rates were associated with high tide and high flow rates associated with low tide. A 1-m increase in seawater height results in a decrease of 20 - 30 L h(-1) or 35 - 56% of the hourly flow rate. Therefore, the changes in gas volume escape from the pore could be attributed to the hydrostatic pressure effect induced by water depth. This dominant mechanism controlled pore activation as well as the gas flow rate, suggesting that in the marine environment, especially the shallow-water shelf area, sea level changes may result in great variations in methane release into the ocean and atmosphere.
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WOS记录号: WOS:000343071100006
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10602
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Di, PF; Feng, D; Chen, DF.Temporal Variation in Natural Gas Seep Rate and Influence Factors in the Lingtou Promontory Seep Field of the Northern South China Sea,TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES,2014,25(5):665-672
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