globalchange  > 气候变化事实与影响
DOI: 10.1002/2014GB004890
Scopus记录号: 2-s2.0-84916885588
论文题名:
Separating the influence of temperature, drought, and fire on interannual variability in atmospheric CO2
作者: Keppel-Aleks G; , Wolf A; S; , Mu M; , Doney S; C; , Morton D; C; , Kasibhatla P; S; , Miller J; B; , Dlugokencky E; J; , Randerson J; T
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期:11
起始页码: 1295
结束页码: 1310
语种: 英语
Scopus关键词: annual variation ; carbon dioxide ; climate change ; drought stress ; fire behavior ; global change ; net ecosystem exchange ; temperature effect ; terrestrial ecosystem
英文摘要: The response of the carbon cycle in prognostic Earth system models (ESMs) contributes significant uncertainty to projections of global climate change. Quantifying contributions of known drivers of interannual variability in the growth rate of atmospheric carbon dioxide (CO2) is important for improving the representation of terrestrial ecosystem processes in these ESMs. Several recent studies have identified the temperature dependence of tropical net ecosystem exchange (NEE) as a primary driver of this variability by analyzing a single, globally averaged time series of CO2 anomalies. Here we examined how the temporal evolution of CO2 in different latitude bands may be used to separate contributions from temperature stress, drought stress, and fire emissions to CO2 variability. We developed atmospheric CO2 patterns from each of these mechanisms during 1997-2011 using an atmospheric transport model. NEE responses to temperature, NEE responses to drought, and fire emissions all contributed significantly to CO2 variability in each latitude band, suggesting that no single mechanism was the dominant driver. We found that the sum of drought and fire contributions to CO2 variability exceeded direct NEE responses to temperature in both the Northern and Southern Hemispheres. Additional sensitivity tests revealed that these contributions are masked by temporal and spatial smoothing of CO2 observations. Accounting for fires, the sensitivity of tropical NEE to temperature stress decreased by 25% to 2.9 ± 0.4 Pg C yr-1 K-1. These results underscore the need for accurate attribution of the drivers of CO2 variability prior to using contemporary observations to constrain long-term ESM responses. ©2014. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77452
Appears in Collections:气候变化事实与影响

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作者单位: Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI, United States; Department of Earth and Environmental Science, University of Michigan, Ann Arbor, MI, United States; Department of Earth System Science, University of California, Irvine, CA, United States; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Biospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Nicholas School of the Environment, Duke University, Durham, NC, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; NOAA Earth System Research Laboratory, Global Monitoring Division, Boulder, CO, United States

Recommended Citation:
Keppel-Aleks G,, Wolf A,S,et al. Separating the influence of temperature, drought, and fire on interannual variability in atmospheric CO2[J]. Global Biogeochemical Cycles,2014-01-01,28(11)
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