{"refrec":{"BRefID":347292,"RR":"<b>Jacques, C.; Sapart, C.J.; Fripiat, F.; Carnat, G.; Zhou, J.; Delille, B.; Röckmann, T.; van der Veen, C.; Niemann, H.; Haskell, T.; Tison, J.-L.</b> (2021). Sources and sinks of methane in sea ice: insights from stable isotopes. <i>Elem. Sci. Anth.  9(1)</i>: 00167. <a href=\"https://dx.doi.org/10.1525/elementa.2020.00167\" target=\"_blank\">https://dx.doi.org/10.1525/elementa.2020.00167</a>","BEntID":343984,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Elem. Sci. Anth.  9(1)</i>: 00167. <a href=\"https://dx.doi.org/10.1525/elementa.2020.00167\" target=\"_blank\">https://dx.doi.org/10.1525/elementa.2020.00167</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Jacques, C.; Sapart, C.J.; Fripiat, F.; Carnat, G.; Zhou, J.; Delille, B.; Röckmann, T.; van der Veen, C.; Niemann, H.; Haskell, T.; Tison, J.-L.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Jacques, C. <i>et al.</i>","Englishabstract":"<p>We report on methane (CH<sub>4</sub>) stable isotope (d<sup>13</sup>C and d    <sup>2</sup>H) measurements from landfast sea ice collected near Barrow    (Utqiagvik, Alaska) and Cape Evans (Antarctica) over the winter-to-springtransition. These measurements provide novel insights into pathways of CH    <sub>4</sub> production and consumption in sea ice. We found substantial    differences between the two sites. Sea ice overlying the shallow shelf of    Barrow was supersaturated in CH<sub>4</sub> with a clear microbial origin,    most likely from methanogenesis in the sediments. We estimated that in situCH<sub>4</sub> oxidation consumed a substantial fraction of the CH    <sub>4</sub> being supplied to the sea ice, partly explaining the large    range of isotopic values observed (d<sup>13</sup>C between -68.5 and -48.5    ‰ and d<sup>2</sup>H between -246 and -104 ‰). Sea ice at Cape Evans wasalso supersaturated in CH<sub>4</sub> but with surprisingly high d    <sup>13</sup>C values (between -46.9 and -13.0 ‰), whereas d<sup>2</sup>H    values (between -313 and -113 ‰) were in the range of those observed at    Barrow.These are the first measurements of CH<sub>4</sub> isotopic    composition in Antarctic sea ice. Our data set suggests a potential    combination of a hydrothermal source, in the vicinity of the Mount Erebus,    with aerobic CH<sub>4</sub> formation in sea ice, although the metabolic    pathway for the latter still needs to be elucidated. Our observations show    that sea ice needs to be considered as an active biogeochemical interface,    contributing to CH<sub>4</sub> production and consumption, which disputes    the standing paradigm that sea ice is an inert barrier passively    accumulating CH<sub>4</sub> at the ocean-atmosphere boundary.</p>","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Sources and sinks of methane in sea ice: insights from stable isotopes","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-30 01:31:53.629517","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Antarctic; Arctic; Consumption pathways; Methane; Production; Sea ice; Stable isotopes","OtherDescriptors":null,"Notes":null,"AnaPub":2021,"MonPub":null,"DateUpdate":"2022-05-23","DateCreate":"2021-11-10","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000711839000001","VABBcode":null,"OpenAcc":1,"DOI":"10.1525/elementa.2020.00167"},"refs":null,"anarec":{"AnaID":347292,"PubliDate":2021,"Pagination":"00167","XtraPublOfAnaID":null,"ISBN":null,"Volume":"9","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":267392,"SerRR":"Elementa Science of the Anthropocene. 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