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dc.contributor.authorMichaud, Alexander B.
dc.contributor.authorDore, John E.
dc.contributor.authorAchberger, Amanda M.
dc.contributor.authorChristner, Brent C.
dc.contributor.authorMitchell, Andrew C.
dc.contributor.authorSkidmore, Mark L.
dc.contributor.authorVick-Majors, Trista J.
dc.contributor.authorPriscu, John C.
dc.identifier.citationMichaud, Alexander B., John E. Dore, Amanda M. Achberger, Brent C. Christner, Andrew C. Mitchell, Mark L. Skidmore, Trista J. Vick-Majors, and John C. Priscu. "Microbial oxidation as a methane sink beneath the West Antarctic Ice Sheet." Nature Geoscience 10 (July 2017): 582-586. DOI: 10.1038/ngeo2992 .en_US
dc.description.abstractAquatic habitats beneath ice masses contain active microbial ecosystems capable of cycling important greenhouse gases, such as methane (CH4). A large methane reservoir is thought to exist beneath the West Antarctic Ice Sheet, but its quantity, source and ultimate fate are poorly understood. For instance, O2 supplied by basal melting should result in conditions favourable for aerobic methane oxidation. Here we use measurements of methane concentrations and stable isotope compositions along with genomic analyses to assess the sources and cycling of methane in Subglacial Lake Whillans (SLW) in West Antarctica. We show that sub-ice-sheet methane is produced through the biological reduction of CO2 using H2. This methane pool is subsequently consumed by aerobic, bacterial methane oxidation at the SLW sediment–water interface. Bacterial oxidation consumes >99% of the methane and represents a significant methane sink, and source of biomass carbon and metabolic energy to the surficial SLW sediments. We conclude that aerobic methanotrophy may mitigate the release of methane to the atmosphere upon subglacial water drainage to ice sheet margins and during periods of deglaciation.en_US
dc.description.sponsorshipNational Science Foundation - Division of Polar Programs grants (0838933, 1346250, 1439774 to J.C.P.; 0838941 to B.C.C.); NSF-IGERT Program (0654336); Montana Space Grant Consortium; NSF-Center for Dark Energy Biosphere Investigations (A.B.M.)en_US
dc.titleMicrobial oxidation as a methane sink beneath the West Antarctic Ice Sheeten_US
mus.citation.journaltitleNature Geoscienceen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentLand Resources & Environmental Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.contributor.orcidVick-Majors, Trista J.|0000-0002-6868-4010en_US
mus.contributor.orcidMitchell, Andrew C.|0000-0001-9749-5326en_US

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