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In-situ and on-line measurement of gas flux at a hydrocarbon seep from the northern South China Sea
Di, Pengfei1,3; Feng, Dong1; Chen, Duofu1,2,3
2014-06-15
Source PublicationCONTINENTAL SHELF RESEARCH
Volume81Issue:1Pages:80-87
Abstract

Natural hydrocarbon seeps in the marine environment are important sources of methane and other greenhouse gases to the ocean and the atmosphere. Accurate quantification of methane flux at hydrocarbon seeps is therefore necessary to evaluate their influence on the global methane budget and climate change. Hydrocarbon seeps on the seabed produce a near-shore gas bubble zone along the shallow western coast of Hainan Island, northern South China Sea. An in-situ and on-line gas flux measuring device was deployed over a hydrocarbon seep to quantify the gas flux by equal volume exchange venting from the seabed offshore of Ledong Town, Hainan Island, over 19 days. The physiochemical parameters and the dissolved methane concentration of the bottom water at the hydrocarbon seep were also measured. The gas flux from the hydrocarbon seep varied from 22 to 771/day with the tidal period and was strongly negatively correlated with water depth. The flux data from the seep suggests that the variation in hydrostatic pressure induced by tidal forcing and ocean swell may control the variation of the gas flux. The bottom water dissolved methane concentration, ranging from 26 to 74 nmol/L, was negatively correlated with temperature and water depth at the seabed and positively with the gas flux. The total gas volume released from the hydrocarbon seep was 30.5 m(3) for the 19-day period, providing an estimated gas flux of 600 m(3)/yr. The 120 known hydrocarbon seeps along the eastern edge of the Yinggehai Basin could vent a large quantity of methane from the seafloor, which suggests that hydrocarbon seeps on the continental margin of the northern South China Sea may be an important natural source of methane to the atmosphere. (C) 2014 Elsevier Ltd. All rights reserved.

SubtypeArticle
KeywordHydrocarbon Seep Gas Flux In-situ And On-line Measurement Fluid Activity Nearshore Yinggehai Northern South China Sea
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.csr.2014.04.001
Indexed BySCI
Language英语
WOS KeywordGulf-of-mexico ; Methane Hydrate Deposits ; Aleutian Subduction Zone ; Yinggehai Basin ; Hydrothermal Vent ; Natural Gases ; Atmospheric Methane ; Chemical Fluxes ; Mud Volcanos ; Time-series
WOS SubjectOceanography
WOS IDWOS:000336825300008
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.idsse.ac.cn/handle/183446/755
Collection外单位合作知识产出
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Guangdong, Peoples R China
3.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China
First Author AffilicationInstitute of Deep-sea Science and Engineering,CAS
Recommended Citation
GB/T 7714
Di, Pengfei,Feng, Dong,Chen, Duofu. In-situ and on-line measurement of gas flux at a hydrocarbon seep from the northern South China Sea[J]. CONTINENTAL SHELF RESEARCH,2014,81(1):80-87.
APA Di, Pengfei,Feng, Dong,&Chen, Duofu.(2014).In-situ and on-line measurement of gas flux at a hydrocarbon seep from the northern South China Sea.CONTINENTAL SHELF RESEARCH,81(1),80-87.
MLA Di, Pengfei,et al."In-situ and on-line measurement of gas flux at a hydrocarbon seep from the northern South China Sea".CONTINENTAL SHELF RESEARCH 81.1(2014):80-87.
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