DOI: 10.1016/j.quascirev.2015.01.004
Scopus记录号: 2-s2.0-84921743197
论文题名: The relative importance of methane sources and sinks over the Last Interglacial period and into the last glaciation
作者: Quiquet A. ; Archibald A.T. ; Friend A.D. ; Chappellaz J. ; Levine J.G. ; Stone E.J. ; Telford P.J. ; Pyle J.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 112 起始页码: 1
结束页码: 16
语种: 英语
英文关键词: Chemistry-climate interactions
; Land surface emissions
; Last Interglacial
; Methane
; Numerical models
; Quaternary
Scopus关键词: Atmospheric chemistry
; Atmospheric humidity
; Budget control
; Climate models
; Glacial geology
; Greenhouse gases
; Methane
; Mixing
; Numerical models
; Surface measurement
; Volatile organic compounds
; Wetlands
; Anthropogenic influence
; Atmospheric concentration
; Chemistry-climate interaction
; Intergovernmental panel on climate changes
; Land surface
; Last interglacial
; Non-methane volatile organic compounds
; Quaternary
; Climate change
; atmospheric forcing
; biogenic emission
; concentration (composition)
; greenhouse gas
; human activity
; land surface
; last glaciation
; Last Interglacial
; lightning
; methane
; mixing ratio
; nitrous oxide
; numerical model
; quantitative analysis
; source-sink dynamics
; volatile organic compound
英文摘要: All recent climatic projections for the next century suggest that we are heading towards a warmer climate than today (Intergovernmental Panel on Climate Change; Fifth Assessment Report), driven by increasing atmospheric burdens of anthropogenic greenhouse gases. In particular, the volume mixing ratio of methane, the second-most important anthropogenic greenhouse gas, has increased by a factor of ~2.5 from the beginning of the European Industrial Revolution. Due to their complex responses to climatic factors, understanding of the dynamics of future global methane emissions and sinks is crucial for the next generation of climate projections. Of relevance to this problem, the Earth likely experienced warmer average temperatures than today during the Last Interglacial (LIG) period (130-115kaBP). Interestingly, ice cores do not indicate a different methane mixing ratio from the Pre-Industrial Holocene (PIH), in other words the current interglacial period prior to anthropogenic influence. This is surprising as warmer temperatures might be expected to increase methane emissions. The present study aims to improve our understanding of the changes in the global methane budget through quantifying the relative importance of sources and sinks of methane during the last full glacial-interglacial cycle.A fairly limited number of studies have investigated this cycle at the millenium time scale with most of them examining the doubling in CH4 from the Last Glacial Maximum (LGM) to the PIH. Though it is still a matter of debate, a general consensus suggests a predominant role to the change in methane emissions from wetlands and only a limited change in the oxidising capacity of the atmosphere. In the present study we provide an estimate of the relative importance of sources and sinks during the LIG period, using a complex climate-chemistry model to quantify the sinks, and a methane emissions model included in a global land surface model, for the sources. We are not aware of any previous studies that have explicitly tackled sources and sinks of methane in the previous interglacial. Our results suggest that both emissions and sinks of methane were higher during the LIG period, relative to the PIH, resulting in similar atmospheric concentrations of methane. Our simulated change in methane lifetime is primarily driven by climate (i.e. air temperature and humidity). However, a significant part of the reduced methane lifetime is also attributable to the impact of changes in NOx emissions from lightning. An increase in biogenic emissions of non-methane volatile organic compounds during the LIG seems unlikely to have compensated for the impact of temperature and humidity. Surface methane emissions from wetlands were higher in northern latitudes due to an increase of summer temperature, whilst the change in the tropics is less certain. Simulated methane emissions are strongly sensitive to the atmospheric forcing, with most of this sensitivity related to changes in wetland extent. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59991
Appears in Collections: 过去全球变化的重建
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作者单位: University of Cambridge, Department of Chemistry, Cambridge, United Kingdom; National Centre for Atmospheric Science, United Kingdom; University of Cambridge, Department of Geography, Cambridge, United Kingdom; Univ. Grenoble Alpes, LGGE, Grenoble, France; CNRS, LGGE, Grenoble, France; University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, United Kingdom; University of Bristol, School of Geographical Sciences, Bristol, United Kingdom
Recommended Citation:
Quiquet A.,Archibald A.T.,Friend A.D.,et al. The relative importance of methane sources and sinks over the Last Interglacial period and into the last glaciation[J]. Quaternary Science Reviews,2015-01-01,112