DOI: 10.1002/2013GB004580
Scopus记录号: 2-s2.0-84894470885
论文题名: Observational constraints on the distribution, seasonality, and environmental predictors of North American boreal methane emissions
作者: Miller S ; M ; , Worthy D ; E ; J ; , Michalak A ; M ; , Wofsy S ; C ; , Kort E ; A ; , Havice T ; C ; , Andrews A ; E ; , Dlugokencky E ; J ; , Kaplan J ; O ; , Levi P ; J ; , Tian H ; , Zhang B
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 2 起始页码: 146
结束页码: 160
语种: 英语
英文关键词: boreal wetlands
; geostatistical inverse model
; Methane fluxes
Scopus关键词: Atmospheric chemistry
; Biogeochemistry
; Budget control
; Estimation
; Soil moisture
; Wetlands
; Anthropogenic emissions
; Anthropogenic sources
; Biogeochemical models
; Boreal wetlands
; Environmental process
; Inverse modeling
; Methane fluxes
; Wetland distribution
; Methane
; anthropogenic source
; atmospheric pollution
; boreal forest
; emission
; flux measurement
; geostatistics
; methane
; numerical model
; observational method
; prediction
; seasonality
; soil moisture
; soil temperature
; spatial distribution
; Alberta
; Canada
; Hudson Bay
英文摘要: Wetlands comprise the single largest global source of atmospheric methane, but current flux estimates disagree in both magnitude and distribution at the continental scale. This study uses atmospheric methane observations over North America from 2007 to 2008 and a geostatistical inverse model to improve understanding of Canadian methane fluxes and associated biogeochemical models. The results bridge an existing gap between traditional top-down, inversion studies, which typically emphasize total emission budgets, and biogeochemical models, which usually emphasize environmental processes. The conclusions of this study are threefold. First, the most complete process-based methane models do not always describe available atmospheric methane observations better than simple models. In this study, a relatively simple model of wetland distribution, soil moisture, and soil temperature outperformed more complex model formulations. Second, we find that wetland methane fluxes have a broader spatial distribution across western Canada and into the northern U.S. than represented in existing flux models. Finally, we calculate total methane budgets for Canada and for the Hudson Bay Lowlands, a large wetland region (50-60°N, 75-96°W). Over these lowlands, we find total methane fluxes of 1.8±0.24 Tg C yr-1, a number in the midrange of previous estimates. Our total Canadian methane budget of 16.0±1.2 Tg C yr -1 is larger than existing inventories, primarily due to high anthropogenic emissions in Alberta. However, methane observations are sparse in western Canada, and additional measurements over Alberta will constrain anthropogenic sources in that province with greater confidence. Key Points Boreal methane emissions differ from existing inventories Estimate methane from the Hudson Bay Lowlands of 1.8 +/- 0.24 TgC/yr A simple methane emissions model best predicts atmospheric methane observations ©2014. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77484
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth and Planetary Sciences, Harvard University, Cambridge MA, United States; Environment Canada, Toronto ON, Canada; Department of Global Ecology, Carnegie Institution for Science, Stanford CA, United States; Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor MI, United States; Global Monitoring Division, NOAA Earth System Research Laboratory, Boulder CO, United States; Environmental Engineering Institute, Ecole Polytechnique Federale de Lausanne, Lausanne, Switzerland; School of Forestry and Wildlife Sciences, Auburn University, Auburn AL, United States
Recommended Citation:
Miller S,M,, Worthy D,et al. Observational constraints on the distribution, seasonality, and environmental predictors of North American boreal methane emissions[J]. Global Biogeochemical Cycles,2014-01-01,28(2)