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Temporal Variation in Natural Gas Seep Rate and Influence Factors in the Lingtou Promontory Seep Field of the Northern South China Sea
Di, Pengfei1,3; Feng, Dong1; Chen, Duofu1,2,3
2014-10-01
Source PublicationTERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES
Volume25Issue:5Pages:665-672
Abstract

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.

SubtypeArticle
KeywordHydrocarbon Seep Methane Flux Time Series Tidal Effect Pore Activation South China Sea
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.3319/TAO.2014.04.30.01(Oc)
Indexed BySCI
Language英语
WOS KeywordGulf-of-mexico ; Methane Hydrate Deposits ; Aleutian Subduction Zone ; Fluid-flow ; Hydrothermal Vent ; Hydrocarbon Seep ; Yinggehai Basin ; Atmospheric Methane ; Chemical Fluxes ; Mud Volcanos
WOS SubjectGeosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Oceanography
WOS IDWOS:000343071100006
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/777
Collection外单位合作知识产出
Affiliation1.Chinese Acad Sci, Key Lab Marginal Sea Geol, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China
3.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Sanya, Peoples R China
First Author AffilicationInstitute of Deep-sea Science and Engineering,CAS
Recommended Citation
GB/T 7714
Di, Pengfei,Feng, Dong,Chen, Duofu. Temporal Variation in Natural Gas Seep Rate and Influence Factors in the Lingtou Promontory Seep Field of the Northern South China Sea[J]. TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES,2014,25(5):665-672.
APA Di, Pengfei,Feng, Dong,&Chen, Duofu.(2014).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,25(5),665-672.
MLA Di, Pengfei,et al."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 25.5(2014):665-672.
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