globalchange  > 气候减缓与适应
DOI: 10.1038/NGEO2992
论文题名:
Microbial oxidation as a methane sink beneath the West Antarctic Ice Sheet
作者: Michaud A.B.; Dore J.E.; Achberger A.M.; Christner B.C.; Mitchell A.C.; Skidmore M.L.; Vick-Majors T.J.; Priscu J.C.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:8
起始页码: 582
结束页码: 586
语种: 英语
Scopus关键词: basal melting ; concentration (composition) ; deglaciation ; greenhouse gas ; ice sheet ; isotopic composition ; methane ; microbial activity ; oxic conditions ; oxidation ; sediment-water interface ; stable isotope ; subglacial environment ; Antarctic Ice Sheet ; Antarctica ; West Antarctic Ice Sheet ; West Antarctica ; Whillans Ice Stream ; Bacteria (microorganisms)
英文摘要: Aquatic 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 > 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. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105740
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, United States; Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, United States; Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, United States; Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom; Department of Earth Sciences, Montana State University, Bozeman, MT, United States; Center for Geomicrobiology, Department of Bioscience, Aarhus University, Aarhus C, Denmark; Department of Oceanography, Texas A and M University, College Station, TX, United States; Départment des Sciences Biologiques, Université du Québec À Montréal, Case Postale 8888, Succursale Centre-Ville, Montréal, QC, Canada

Recommended Citation:
Michaud A.B.,Dore J.E.,Achberger A.M.,et al. Microbial oxidation as a methane sink beneath the West Antarctic Ice Sheet[J]. Nature Geoscience,2017-01-01,10(8)
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