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The Distribution of Dissolved Methane and Its Air-Sea Flux in the Plume of a Seep Field, Lingtou Promontory, South China Sea
Di, Pengfei; Feng, Dong1,2; Chen, Duofu1,2
2019
Source PublicationGEOFLUIDS
ISSN1468-8115
Volume2019Pages:UNSP 3240697
AbstractMethane (CH4), the most abundant hydrocarbon gas in the atmosphere, plays an important role in global climate change. Quantifying the dissolved methane and its air-sea flux from hydrocarbon seeps is therefore of great importance. Large quantities of natural gas are emitted from the seafloor to the coastal ocean near the Lingtou Promontory, South China Sea. We quantified concentrations of methane in surface and bottom waters at 48 stations in a 56km(2) study area. High spatial variability in dissolved methane concentrations was observed in the surface mixed layer (0.5m water depth) and bottom water (water-sediment interface), with values ranging from 2.90nmolL(-1) to 13570.02nmolL(-1) and from 4.98nmolL(-1) to 31740.02nmolL(-1), respectively. The significant difference between concentrations of dissolved methane in surface and bottom waters suggests that most of the methane emitted from the seafloor is dissolved in the water column. The dissolution of methane in seawater may result in local oxygen depletion that may lead to ecological effects. The delta C-13 values of dissolved methane ranging from -59.76 parts per thousand to -48.59 parts per thousand indicate a mixture of biogenic and thermogenic gas sources. The average air-sea methane flux of Yinggehai Basin was 672.57 mu molm(-2)d(-1), which cannot be ignored in environment assessment. Coastal regions, especially with hydrocarbon seeps in shallow waters of the continental margin, may therefore be an important source of methane to the atmosphere.
DepartmentOMG
DOI10.1155/2019/3240697
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17946
Collection中科院边缘海地质重点实验室
Affiliation1.Chinese Acad Sci, CAS Key Lab Ocean & Marginal Sea Geol, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Shandong, Peoples R China
3.Shanghai Ocean Univ, Shanghai Engn Res Ctr Hadal Sci & Technol, Coll Marine Sci, Shanghai 201306, Peoples R China
Recommended Citation
GB/T 7714
Di, Pengfei,Feng, Dong,Chen, Duofu. The Distribution of Dissolved Methane and Its Air-Sea Flux in the Plume of a Seep Field, Lingtou Promontory, South China Sea[J]. GEOFLUIDS,2019,2019:UNSP 3240697.
APA Di, Pengfei,Feng, Dong,&Chen, Duofu.(2019).The Distribution of Dissolved Methane and Its Air-Sea Flux in the Plume of a Seep Field, Lingtou Promontory, South China Sea.GEOFLUIDS,2019,UNSP 3240697.
MLA Di, Pengfei,et al."The Distribution of Dissolved Methane and Its Air-Sea Flux in the Plume of a Seep Field, Lingtou Promontory, South China Sea".GEOFLUIDS 2019(2019):UNSP 3240697.
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