DOI: 10.1038/ngeo1922
论文题名: Independent variations of CH 4 emissions and isotopic composition over the past 160,000 years
作者: Möller L. ; Sowers T. ; Bock M. ; Spahni R. ; Behrens M. ; Schmitt J. ; Miller H. ; Fischer H.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 10 起始页码: 885
结束页码: 890
语种: 英语
Scopus关键词: carbon dioxide
; carbon emission
; climate effect
; climate variation
; greenhouse gas
; ice core
; isotopic composition
; Last Glacial
; methane
; paleoatmosphere
; temperature profile
; Antarctica
; East Antarctica
; Queen Maud Land
; Vostok Station
英文摘要: During the last glacial cycle, greenhouse gas concentrations fluctuated on decadal and longer timescales. Concentrations of methane, as measured in polar ice cores, show a close connection with Northern Hemisphere temperature variability, but the contribution of the various methane sources and sinks to changes in concentration is still a matter of debate. Here we assess changes in methane cycling over the past 160,000 years by measurements of the carbon isotopic composition δ 13 C of methane in Antarctic ice cores from Dronning Maud Land and Vostok. We find that variations in the δ 13 C of methane are not generally correlated with changes in atmospheric methane concentration, but instead more closely correlated to atmospheric CO 2 concentrations. We interpret this to reflect a climatic and CO 2 -related control on the isotopic signature of methane source material, such as ecosystem shifts in the seasonally inundated tropical wetlands that produce methane. In contrast, relatively stable δ 13 C values occurred during intervals of large changes in the atmospheric loading of methane. We suggest that most methane sources - most notably tropical wetlands - must have responded simultaneously to climate changes across these periods. © 2013 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106692
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: Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, 27568 Bremerhaven, Germany; Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland; Pennsylvania State University, University Park, PA 16802, United States
Recommended Citation:
Möller L.,Sowers T.,Bock M.,et al. Independent variations of CH 4 emissions and isotopic composition over the past 160,000 years[J]. Nature Geoscience,2013-01-01,6(10)