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The impact of the abnormal salinity enrichment in pore water on the thermodynamic stability of marine natural gas hydrates in the Arctic region

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dc.contributor.authorChoi, Wonjung-
dc.contributor.authorLee, Joonseop-
dc.contributor.authorKim, Young-Gyun-
dc.contributor.authorKim, Hanwoong-
dc.contributor.authorRhee, Tae Siek-
dc.contributor.authorJin, Young Keun-
dc.contributor.authorKim, Ji-Hoon-
dc.contributor.authorSeo, Yongwon-
dc.date.accessioned2021-11-29T04:55:03Z-
dc.date.available2021-11-29T04:55:03Z-
dc.date.issued2021-12-10-
dc.identifier.urihttps://repository.kopri.re.kr/handle/201206/13012-
dc.description.abstractIn this study, the thermodynamic and structural characteristics of natural gas hydrates (NGHs) retrieved from gas hydrate mounds (ARAON Mound 03 (AM03) and ARAON Mound 06 (AM06)) in the Chukchi Sea in the Arctic region were investigated. The gas compositions, crystalline structure, and cage occupancy of the NGHs at AM03 and AM06 were experimentally measured using gas chromatography (GC), C-13 nuclear magnetic resonance (NMR), Raman spectroscopy, and powder X-ray diffraction (PXRD). In the NGHs from AM03 and AM06, a significantly large fraction of CH4 (> 99%) and a very small amount of H2S were enclathrated in small (5(12)) and large (5(12)6(2)) cages of sl hydrate. The NGHs from AM03 and AM06 were almost identical in composition, guest distri- butions, and existing environment to each other. The salinity of the residual pore water in the hydrate-bearing sediment (AM06) was measured to be 50.32 parts per thousand, which was much higher than that of seawater (34.88 parts per thousand). This abnormal salinity enrichment in the pore water of the low-permeability sediment might induce the dissociation of NGHs at a lower temperature than expected. The saturation changes in the NGHs that corresponded with an increase in the seawater temperature were also predicted on the basis of the salinity changes in the pore water. The experimental and predicted results of this study would be helpful for understanding the thermodynamic stability of NGHs and potential CH4-releasing phenomena in the Arctic region. (C) 2021 Elsevier B.V. All rights reserved.en_US
dc.formatapplication/pdf-
dc.languageEnglishen_US
dc.language.isoenen_US
dc.subjectEnvironmental Sciences & Ecologyen_US
dc.subject.classificationAraonen_US
dc.titleThe impact of the abnormal salinity enrichment in pore water on the thermodynamic stability of marine natural gas hydrates in the Arctic regionen_US
dc.title.alternative북극 해저 천연 가스하이드레이트의 열역학적 안정조건에 미치는 공극수 내 높은 염분농도의 영향en_US
dc.typeArticleen_US
dc.identifier.bibliographicCitationChoi, Wonjung, et al. 2021-12-10. "The impact of the abnormal salinity enrichment in pore water on the thermodynamic stability of marine natural gas hydrates in the Arctic region". <em>SCIENCE OF THE TOTAL ENVIRONMENT</em>, 799: 1-9.-
dc.citation.titleSCIENCE OF THE TOTAL ENVIRONMENTen_US
dc.citation.volume799en_US
dc.identifier.doi10.1016/j.scitotenv.2021.149357-
dc.coverage.x75° 44.38'Nen_US
dc.coverage.x75° 39.82'Nen_US
dc.coverage.y169° 51.26'Wen_US
dc.coverage.y169° 44.46'Wen_US
dc.citation.startPage1en_US
dc.citation.endPage9en_US
dc.description.articleClassificationSCIE-
dc.description.jcrRateJCR 2019:8.302en_US
dc.subject.keywordArcticen_US
dc.subject.keywordNatural gas hydratesen_US
dc.subject.keywordSalinityen_US
dc.subject.keywordStructure Ien_US
dc.subject.keywordThermodynamic stabilityen_US
dc.subject.keywordSaturationen_US
dc.identifier.localId2021-0156-
dc.identifier.scopusid2-s2.0-85111722874-
dc.identifier.wosid000701267700006-
Appears in Collections  
2021-2021, Survey of Geology and Seabed Environmental Change in the Arctic Seas (21-21) / Hong, Jong Kuk (PM21050)
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