globalchange  > 气候变化事实与影响
DOI: 10.1002/2016GB005570
Scopus记录号: 2-s2.0-85017124179
论文题名:
Atmospheric methane variability: Centennial-scale signals in the Last Glacial Period
作者: Rhodes R; H; , Brook E; J; , McConnell J; R; , Blunier T; , Sime L; C; , Faïn X; , Mulvaney R
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期:3
起始页码: 575
结束页码: 590
语种: 英语
英文关键词: atmospheric composition ; centennial variability ; ice cores ; Last Glacial Period ; methane ; paleoclimate
Scopus关键词: atmospheric chemistry ; biogeochemistry ; Holocene ; ice core ; Last Glacial ; methane ; paleoclimate ; Antarctic Ice Sheet ; Antarctica
英文摘要: In order to understand atmospheric methane (CH4) biogeochemistry now and in the future, we must apprehend its natural variability, without anthropogenic influence. Samples of ancient air trapped within ice cores provide the means to do this. Here we analyze the ultrahigh-resolution CH4 record of the West Antarctic Ice Sheet Divide ice core 67.2–9.8 ka and find novel, atmospheric CH4 variability at centennial time scales throughout the record. This signal is characterized by recurrence intervals within a broad 80–500 year range, but we find that age-scale uncertainties complicate the possible isolation of any periodic frequency. Lower signal amplitudes in the Last Glacial relative to the Holocene may be related to incongruent effects of firn-based signal smoothing processes. Within interstadial and stadial periods, the peak-to-peak signal amplitudes vary in proportion to the underlying millennial-scale oscillations in CH4 concentration—the relative amplitude change is constant. We propose that the centennial CH4 signal is related to tropical climate variability that influences predominantly low-latitude wetland CH4 emissions. ©2017. American Geophysical Union. 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/77757
Appears in Collections:气候变化事实与影响

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作者单位: Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom; College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; Division of Hydrologic Sciences, Desert Research Institute, Reno, NV, United States; Center for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark; British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom; Université Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, Grenoble, France

Recommended Citation:
Rhodes R,H,, Brook E,et al. Atmospheric methane variability: Centennial-scale signals in the Last Glacial Period[J]. Global Biogeochemical Cycles,2017-01-01,31(3)
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