Assessment of shallow methane (CH4) gas using stable carbon and hydrogen isotopes in the sediments of the Gunsan Basin, eastern-central Yellow Sea, off the southwest of Korea
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 이준호 | - |
dc.contributor.author | 정갑식 | - |
dc.contributor.author | 우한준 | - |
dc.contributor.author | 강정원 | - |
dc.contributor.author | Urumu Tsunogai | - |
dc.date.accessioned | 2020-07-15T18:54:33Z | - |
dc.date.available | 2020-07-15T18:54:33Z | - |
dc.date.created | 2020-02-11 | - |
dc.date.issued | 2016-12-12 | - |
dc.identifier.uri | https://sciwatch.kiost.ac.kr/handle/2020.kiost/24258 | - |
dc.description.abstract | In the Gunsan Basin, eastern-central Yellow Sea (YS), gas seepages were observed from the uppermost sedimentary layer charged locally with gases that are important indicators of marine resources, environmental changes, and geo-hazards. Methane (CH4) among the gases is the most abundant organic compound in the Earth’s atmosphere, where it acts as a greenhouse gas and thus has implications for global climate change. Headspace CH4 was determined in surface and core sediments in order to understand the C- and H- isotopes signatures in the Gunsan Basin that were collected onboard R/V Onnuri and Eardo in 2013 to 2015. The surface sediments contain 0.2 to 16.9 µ M CH4 that are mostly produced by microbial fermentation of organic materials in shallow depth, as indicated by the light values of δ13CCH4 (– 70.2~-50.7‰ VPDB). CH4 is actively seeping mainly in the western central part of the Gunsan Basin where the underlying sedimentary layers are thick and heavily faulted. In the cores, CH4 is concentrated 1 to 20 μM through the core depths without any relationships to grain size, organic matter contents. Largely different from those, δ13CCH4 ranges in – 62.0~-18.0‰ VPDB (δ2DCH4 range in – 296.0~-144.0‰ VSMOW), that is, strongly mixed CH4 of thermogenic and biogenic origins in the core sediments. The CH4 flux at the sediment-water interface (SWI) using Fick’s first law of diffusion was calculated 2~2ane (CH4) among the gases is the most abundant organic compound in the Earth’s atmosphere, where it acts as a greenhouse gas and thus has implications for global climate change. Headspace CH4 was determined in surface and core sediments in order to understand the C- and H- isotopes signatures in the Gunsan Basin that were collected onboard R/V Onnuri and Eardo in 2013 to 2015. The surface sediments contain 0.2 to 16.9 µ M CH4 that are mostly produced by microbial fermentation of organic materials in shallow depth, as indicated by the light values of δ13CCH4 (– 70.2~-50.7‰ VPDB). CH4 is actively seeping mainly in the western central part of the Gunsan Basin where the underlying sedimentary layers are thick and heavily faulted. In the cores, CH4 is concentrated 1 to 20 μM through the core depths without any relationships to grain size, organic matter contents. Largely different from those, δ13CCH4 ranges in – 62.0~-18.0‰ VPDB (δ2DCH4 range in – 296.0~-144.0‰ VSMOW), that is, strongly mixed CH4 of (중략) | - |
dc.description.uri | 1 | - |
dc.language | English | - |
dc.publisher | 2016 AGU Fall Meeting | - |
dc.relation.isPartOf | 2016 American Geophysical Union (AGU) | - |
dc.title | Assessment of shallow methane (CH4) gas using stable carbon and hydrogen isotopes in the sediments of the Gunsan Basin, eastern-central Yellow Sea, off the southwest of Korea | - |
dc.type | Conference | - |
dc.citation.conferencePlace | US | - |
dc.citation.endPage | 2 | - |
dc.citation.startPage | 1 | - |
dc.citation.title | 2016 American Geophysical Union (AGU) | - |
dc.contributor.alternativeName | 이준호 | - |
dc.contributor.alternativeName | 정갑식 | - |
dc.contributor.alternativeName | 우한준 | - |
dc.contributor.alternativeName | 강정원 | - |
dc.identifier.bibliographicCitation | 2016 American Geophysical Union (AGU), pp.1 - 2 | - |
dc.description.journalClass | 1 | - |