DOI: 10.1007/s10584-014-1072-9
Scopus记录号: 2-s2.0-84926278195
论文题名: North American terrestrial CO2 uptake largely offset by CH4 and N2O emissions: toward a full accounting of the greenhouse gas budget
作者: Tian H. ; Chen G. ; Lu C. ; Xu X. ; Hayes D.J. ; Ren W. ; Pan S. ; Huntzinger D.N. ; Wofsy S.C.
刊名: Climatic Change
ISSN: 0165-0009
EISSN: 1573-1480
出版年: 2015
卷: 129, 期: 2018-03-04 起始页码: 413
结束页码: 426
语种: 英语
Scopus关键词: Budget control
; Climate change
; Climate models
; Ecology
; Ecosystems
; Gas emissions
; Global warming
; Greenhouse effect
; Greenhouse gases
; Inverse problems
; Uncertainty analysis
; Biogeochemical modeling
; Elevated tropospheric ozones
; Environmental factors
; Global warming potential
; Inverse modeling
; Relative contribution
; Satellite observations
; Terrestrial ecosystems
; Carbon dioxide
英文摘要: The terrestrial ecosystems of North America have been identified as a sink of atmospheric CO2 though there is no consensus on the magnitude. However, the emissions of non-CO2 greenhouse gases (CH4 and N2O) may offset or even overturn the climate cooling effect induced by the CO2 sink. Using a coupled biogeochemical model, in this study, we have estimated the combined global warming potentials (GWP) of CO2, CH4 and N2O fluxes in North American terrestrial ecosystems and quantified the relative contributions of environmental factors to the GWP changes during 1979–2010. The uncertainty range for contemporary global warming potential has been quantified by synthesizing the existing estimates from inventory, forward modeling, and inverse modeling approaches. Our “best estimate” of net GWP for CO2, CH4 and N2O fluxes was −0.50 ± 0.27 Pg CO2 eq/year (1 Pg = 1015 g) in North American terrestrial ecosystems during 2001–2010. The emissions of CH4 and N2O from terrestrial ecosystems had offset about two thirds (73 %±14 %) of the land CO2 sink in the North American continent, showing large differences across the three countries, with offset ratios of 57 % ± 8 % in US, 83 % ± 17 % in Canada and 329 % ± 119 % in Mexico. Climate change and elevated tropospheric ozone concentration have contributed the most to GWP increase, while elevated atmospheric CO2 concentration have contributed the most to GWP reduction. Extreme drought events over certain periods could result in a positive GWP. By integrating the existing estimates, we have found a wide range of uncertainty for the combined GWP. From both climate change science and policy perspectives, it is necessary to integrate ground and satellite observations with models for a more accurate accounting of these three greenhouse gases in North America. © 2014, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/84653
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: International Center for Climate and Global Change Research and School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL, United States; Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States; School of Earth Sciences and Environmental Sustainability, North Arizona University, Flagstaff, AZ, United States; Department of Earth and Planetary Science, Harvard University, 29 Oxford St., Cambridge, MA, United States
Recommended Citation:
Tian H.,Chen G.,Lu C.,et al. North American terrestrial CO2 uptake largely offset by CH4 and N2O emissions: toward a full accounting of the greenhouse gas budget[J]. Climatic Change,2015-01-01,129(2018-03-04)