globalchange  > 气候变化事实与影响
DOI: 10.1002/2016GB005504
Scopus记录号: 2-s2.0-85017380121
论文题名:
Measurement of the 13C isotopic signature of methane emissions from northern European wetlands
作者: Fisher R; E; , France J; L; , Lowry D; , Lanoisellé M; , Brownlow R; , Pyle J; A; , Cain M; , Warwick N; , Skiba U; M; , Drewer J; , Dinsmore K; J; , Leeson S; R; , Bauguitte S; J; -B; , Wellpott A; , O'Shea S; J; , Allen G; , Gallagher M; W; , Pitt J; , Percival C; J; , Bower K; , George C; , Hayman G; D; , Aalto T; , Lohila A; , Aurela M; , Laurila T; , Crill P; M; , McCalley C; K; , Nisbet E; G
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期:3
起始页码: 605
结束页码: 623
语种: 英语
英文关键词: isotopes ; methane ; wetland
Scopus关键词: air sampling ; atmosphere ; boreal forest ; carbon isotope ; data set ; emission ; flux measurement ; inverse analysis ; isotopic analysis ; methane ; numerical model ; wetland ; Arctic ; Europe ; Fennoscandia
英文摘要: Isotopic data provide powerful constraints on regional and global methane emissions and their source profiles. However, inverse modeling of spatially resolved methane flux is currently constrained by a lack of information on the variability of source isotopic signatures. In this study, isotopic signatures of emissions in the Fennoscandian Arctic have been determined in chambers over wetland, in the air 0.3 to 3 m above the wetland surface and by aircraft sampling from 100 m above wetlands up to the stratosphere. Overall, the methane flux to atmosphere has a coherent δ13C isotopic signature of −71 ± 1‰, measured in situ on the ground in wetlands. This is in close agreement with δ13C isotopic signatures of local and regional methane increments measured by aircraft campaigns flying through air masses containing elevated methane mole fractions. In contrast, results from wetlands in Canadian boreal forest farther south gave isotopic signatures of −67 ± 1‰. Wetland emissions dominate the local methane source measured over the European Arctic in summer. Chamber measurements demonstrate a highly variable methane flux and isotopic signature, but the results from air sampling within wetland areas show that emissions mix rapidly immediately above the wetland surface and methane emissions reaching the wider atmosphere do indeed have strongly coherent C isotope signatures. The study suggests that for boreal wetlands (>60°N) global and regional modeling can use an isotopic signature of −71‰ to apportion sources more accurately, but there is much need for further measurements over other wetlands regions to verify this. ©2017. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77756
Appears in Collections:气候变化事实与影响

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作者单位: Department of Earth Sciences, Royal Holloway University of London, Egham, United Kingdom; School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; Centre for Atmospheric Science, University of Cambridge, Cambridge, United Kingdom; National Centre for Atmospheric Science, Cambridge, United Kingdom; Centre for Ecology and Hydrology, Penicuik, United Kingdom; Facility for Airborne Atmospheric Measurements, Cranfield University, Cranfield, United Kingdom; School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, United Kingdom; Centre for Ecology and Hydrology, Wallingford, United Kingdom; Climate Change Research, Finnish Meteorological Institute, Helsinki, Finland; Department of Geological Sciences, Stockholm University, Stockholm, Sweden; Thomas H. Gosnell School of Life Sciences, RIT College of Science, Rochester, NY, United States

Recommended Citation:
Fisher R,E,, France J,et al. Measurement of the 13C isotopic signature of methane emissions from northern European wetlands[J]. Global Biogeochemical Cycles,2017-01-01,31(3)
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