Show simple item record

dc.contributor.authorJacques, Caroline
dc.contributor.authorSapart, Celia J.
dc.contributor.authorFripiat, François
dc.contributor.authorCarnat, Gauthier
dc.contributor.authorZhou, Jiayun
dc.contributor.authorDelille, Bruno
dc.contributor.authorRöckmann, Thomas
dc.contributor.authorvan der Veen, Carina
dc.contributor.authorNiemann, Helge
dc.contributor.authorHaskell, Tim
dc.contributor.authorTison, Jean-Louis
dc.date.accessioned2021-11-23T13:30:30Z
dc.date.available2021-11-23T13:30:30Z
dc.date.issued2021-10-27
dc.description.abstractWe 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-spring transition. 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 situ CH<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 was also 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.en_US
dc.identifier.citationJacques C, Sapart, Fripiat, Carnat G, Zhou, Delille B, Röckmann T, van der Veen C, Niemann H, Haskell, Tison J. Sources and sinks of methane in sea ice: Insights from stable isotopes. Elementa: Science of the Anthropocene. 2021;9(1)en_US
dc.identifier.cristinIDFRIDAID 1949649
dc.identifier.doi10.1525/elementa.2020.00167
dc.identifier.issn2325-1026
dc.identifier.urihttps://hdl.handle.net/10037/23138
dc.language.isoengen_US
dc.publisherUniversity of California Pressen_US
dc.relation.journalElementa: Science of the Anthropocene
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleSources and sinks of methane in sea ice: Insights from stable isotopesen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


File(s) in this item

Thumbnail

This item appears in the following collection(s)

Show simple item record