globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12124
Scopus记录号: 2-s2.0-84922723398
论文题名:
Methane sources in arctic thermokarst lake sediments on the North Slope of Alaska
作者: Matheus Carnevali P.B.; Rohrssen M.; Williams M.R.; Michaud A.B.; Adams H.; Berisford D.; Love G.D.; Priscu J.C.; Rassuchine O.; Hand K.P.; Murray A.E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2015
卷: 13, 期:2
起始页码: 181
结束页码: 197
语种: 英语
Scopus关键词: gene expression ; greenhouse gas ; lacustrine deposit ; methane ; organic matter ; permafrost ; pollutant source ; sediment chemistry ; sediment core ; sediment pollution ; stable isotope ; substrate ; thermokarst ; Alaska ; North Slope ; United States ; methane ; archaeon ; Arctic ; chemistry ; lake ; metabolism ; microbiology ; sediment ; temperature ; United States ; Alaska ; Archaea ; Arctic Regions ; Geologic Sediments ; Lakes ; Methane ; Temperature
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: The permafrost on the North Slope of Alaska is densely populated by shallow lakes that result from thermokarst erosion. These lakes release methane (CH4) derived from a combination of ancient thermogenic pools and contemporary biogenic production. Despite the potential importance of CH4 as a greenhouse gas, the contribution of biogenic CH4 production in arctic thermokarst lakes in Alaska is not currently well understood. To further advance our knowledge of CH4 dynamics in these lakes, we focused our study on (i) the potential for microbial CH4 production in lake sediments, (ii) the role of sediment geochemistry in controlling biogenic CH4 production, and (iii) the temperature dependence of this process. Sediment cores were collected from one site in Siqlukaq Lake and two sites in Sukok Lake in late October to early November. Analyses of pore water geochemistry, sedimentary organic matter and lipid biomarkers, stable carbon isotopes, results from CH4 production experiments, and copy number of a methanogenic pathway-specific gene (mcrA) indicated the existence of different sources of CH4 in each of the lakes chosen for the study. Analysis of this integrated data set revealed that there is biological CH4 production in Siqlukaq at moderate levels, while the very low levels of CH4 detected in Sukok had a mixed origin, with little to no biological CH4 production. Furthermore, methanogenic archaea exhibited temperature-dependent use of in situ substrates for methanogenesis, and the amount of CH4 produced was directly related to the amount of labile organic matter in the sediments. This study constitutes an important first step in better understanding the actual contribution of biogenic CH4 from thermokarst lakes on the coastal plain of Alaska to the current CH4 budgets. © 2015 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85155
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作者单位: Division of Earth and Ecosystem Sciences, Desert Research Institute, Reno, NV, United States; Department of Biochemistry and Molecular Biology, University of Nevada, Reno, NV, United States; Department of Earth Sciences, University of California, Riverside, CA, United States; Department of Land Resources and Environmental Science, Montana State University, Bozeman, MT, United States; Propulsion, Thermal and Materials Engineering, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Solar System Exploration, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States

Recommended Citation:
Matheus Carnevali P.B.,Rohrssen M.,Williams M.R.,et al. Methane sources in arctic thermokarst lake sediments on the North Slope of Alaska[J]. Geobiology,2015-01-01,13(2)
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