{"refrec":{"BRefID":285254,"RR":"<b>Tseng, H.-C.; Chen, C.-T.A.; Borges, A.V.; DelValls, T.A.; Chang, Y.-C.</b> (2017). Methane in the South China Sea and the Western Philippine Sea. <i>Cont. Shelf Res. 135</i>: 23-34. <a href=\"https://dx.doi.org/10.1016/j.csr.2017.01.005\" target=\"_blank\">https://dx.doi.org/10.1016/j.csr.2017.01.005</a>","BEntID":277279,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Cont. Shelf Res. 135</i>: 23-34. <a href=\"https://dx.doi.org/10.1016/j.csr.2017.01.005\" target=\"_blank\">https://dx.doi.org/10.1016/j.csr.2017.01.005</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Tseng, H.-C.; Chen, C.-T.A.; Borges, A.V.; DelValls, T.A.; Chang, Y.-C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Tseng, H.-C. <i>et al.</i>","Englishabstract":"Approximately 700 water samples from the South China Sea (SCS) and 300 water samples from the western Philippine Sea (wPS) were collected during eight cruises from August 2003 to July 2007 to determine methane (CH<sub>4</sub>) distributions from the surface to a depth of 4250 m. The surface CH<sub>4</sub> concentrations exceeded atmospheric equilibrium, both in the SCS and the wPS, and the concentrations were 4.5±3.6 and 3.0±1.2 nmol L<sup>−1</sup>, respectively. The sea-to-air fluxes were calculated, and the SCS and the wPS were found to emit CH<sub>4</sub> to the atmosphere at 8.6±6.4 µmol m<sup>−2</sup> d<sup>−1</sup> and 4.9±4.9 µmol m<sup>−2</sup> d<sup>−1</sup>, respectively. In the SCS, CH<sub>4</sub> emissions were higher over the continental shelf (11.0±7.4 µmol m<sup>−2</sup> d<sup>−1</sup>) than over the deep ocean (6.1±6.0 µmol m<sup>−2</sup> d<sup>−1</sup>), owing to greater biological productivity and closer coupling with the sediments on the continental shelf. The SCS emitted 30.1×10<sup>6</sup> mol d<sup>−1</sup> CH<sub>4</sub> to the atmosphere and exported 1.82×10<sup>6</sup> mol d<sup>−1</sup> CH<sub>4</sub> to the wPS.The concentrations of both CH<sub>4</sub> and chlorophyll <em>a</em> were high in the 150 m surface layer of the wPS, but were not significantly correlated with each other. CH<sub>4</sub> concentrations generally declined with increasing depth below the euphotic zone but remained constant below 1,000 m, both in the SCS and the wPS. Some high CH<sub>4</sub> concentrations were observed at mid-depths and bottom waters in the SCS, and were most likely caused by the release of CH<sub>4</sub> from gas hydrates or gas seepage.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Methane in the South China Sea and the Western Philippine Sea","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-24 01:32:28.126488","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"South China Sea; Western Philippine Sea; CH4; Sea-to-air flux;Chlorophyll a; Gas hydrates","OtherDescriptors":null,"Notes":null,"AnaPub":2017,"MonPub":null,"DateUpdate":"2019-07-15","DateCreate":"2017-05-16","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000396956800003","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.csr.2017.01.005"},"refs":null,"anarec":{"AnaID":285254,"PubliDate":2017,"Pagination":"23-34","XtraPublOfAnaID":null,"ISBN":null,"Volume":"135","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42769,"SerRR":"Continental Shelf Research. 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