{"refrec":{"BRefID":283180,"RR":"<b>Hartley, T.</b> (2016). Cycle du méthane dans la Mer du Nord et l’estuaire de l’Escaut. MSc Thesis. Université Libre de Bruxelles: Bruxelles.  61 pp.","BEntID":275199,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". MSc Thesis. Université Libre de Bruxelles: Bruxelles.  61 pp.","DocTypID":5,"DocType":"Book/Monograph","MarineFlag":0,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Hartley, T.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Hartley, T.","Englishabstract":"Aquatic environments may act as sinks or sources for greenhouse gases, such as carbon dioxide (CO<sub>2</sub>), methane (CH<sub>4</sub>) and nitrous oxide (N20). Recent studies have shown estuarine environments may emit up to 0.02-0.5 nmol/m<sup>-2</sup>/day<sup>-1</sup>. This study focuses on the CH4 cycle in the Western Scheldt estuary. Cruises were carried out during which continuous CH<sub>4</sub> concentrations were performed, testing the brand new HISEM sensors. Water was also sampled for both analyses of CH<sub>4</sub> concentration and CH<sub>4</sub> isotopic composition. The study shows that there is spatial and temporal variability of CH<sub>4</sub> concentrations in surface waters, with values in the open estuary and downstream Scheldt & portal area ranging respectively from 40 to 173 nmol/L and from 16 to 216nmol/L. Isotopic analysis, of <sup>13</sup>C and deuterium in CH<sub>4</sub>, from samples coming from the mouth and middle of the estuary support the current view that CH<sub>4</sub>, produced in estuarine waters, is of biogenic origin. Isotopic signatures of δ<sup>13</sup>C<sub>-CH4</sub> ranging from -61 to -51‰ (vs VPDB) and δD-CH4 ranging from -212 to -150‰ (vs VSMOW) were measured, typical signatures of biogenic pathways. On the other hand, samples coming from the downstream Scheldt and portal area have an isotopic signature enriched in heavy isotopes, with δ<sup>13</sup>C<sub>-CH4</sub> and δD<sub>-CH4</sub> values falling in the range of -45 to -25‰ (vs VPDB) and -64 to 110‰ (vs VSMOW) respectively. These are signatures associated with thermogenic CH4. However, thermogenic sources are generally accompanied by high CH<sub>4</sub> concentrations, contrary to what was observed. The hypothesis of enrichment in heavy isotopes, through oxidation of methane by methanotrophic bacteria, was dismissed due to calculated ɛ values. Contamination of Scheldt waters remains a possible cause.","AbstractOtherLang":null,"BibLvlCode":"M","StandardTitle":"Cycle du méthane dans la Mer du Nord et l’estuaire de l’Escaut","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":2016,"DateUpdate":"2017-02-09","DateCreate":"2017-02-02","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":null,"monrec":{"MonID":283180,"ISBN":null,"PubliDate":2016,"IssueDate":null,"Volume":null,"Issue":null,"Pagination":"61","Place":"Bruxelles","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":null,"SerRR":null,"Ser2BRefID":null,"Ser2RR":null,"StandardTitleSer":null,"ISSN":null,"AbbrevSer":null,"Degree":"MSc","ThesisID":283180,"InsID":null,"Acronym":null,"FullStandardName":null,"ToPubliDate":null,"SerNotes":null,"eISBN":null,"Pages":61},"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Hartley","Firstname":"Thomas","Initials":"T.","Affiliation":"Universite Libre de Bruxelles","Discriminator":null,"CorporateFlag":0,"BEntID":275199,"AutID":248628,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":"Université Libre de Bruxelles; 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