globalchange  > 气候减缓与适应
DOI: 10.1029/2018JG004520
Scopus记录号: 2-s2.0-85050877592
论文题名:
Large-Scale Droughts Responsible for Dramatic Reductions of Terrestrial Net Carbon Uptake Over North America in 2011 and 2012
作者: He W.; Ju W.; Schwalm C.R.; Sippel S.; Wu X.; He Q.; Song L.; Zhang C.; Li J.; Sitch S.; Viovy N.; Friedlingstein P.; Jain A.K.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期:7
起始页码: 2053
结束页码: 2071
语种: 英语
英文关键词: carbon cycle model ; carbon uptake ; drought ; Earth observation ; North America ; spring warming
英文摘要: Recently, severe droughts that occurred in North America are likely to have impacted its terrestrial carbon sink. However, process-based understanding of how meteorological conditions prior to the onset of drought, for instance warm or cold springs, affect drought-induced carbon cycle effects remains scarce. Here we assess and compare the response of terrestrial carbon fluxes to summer droughts in 2011 and 2012 characterized by contrasting spring conditions. The analysis is based on a comprehensive ensemble of carbon cycle models, including FLUXCOM, TRENDY v5, SiBCASA, CarbonTracker Europe, and CarbonTracker, and emerging Earth observations. In 2011, large reductions of net ecosystem production (NEP; −0.24 ± 0.17 Pg C/year) are due to decreased gross primary production (−0.17 ± 0.18 Pg C/year) and slightly increased ecosystem respiration (+0.07 ± 0.17 Pg C/year). Conversely, in 2012, NEP reductions (−0.17 ± 0.25 Pg C/year) are attributed to a larger increase of ecosystem respiration (+0.48 ± 0.27 Pg C/year) than gross primary production (+0.31 ± 0.29 Pg C/year), induced predominantly by an extra warmer spring prior to summer drought. Two temperate ecoregions crops/agriculture and the grass/shrubs contribute largest to these reductions and also dominate the interannual variations of NEP during 2007–2014. Moreover, the warming spring compensated largely the negative carbon anomaly due to summer drought, consistent with earlier studies; however, the compensation occurred only in some specific ecoregions. Overall, our analysis offers a refined view on recent carbon cycle variability and extremes in North America. It corroborates earlier results but also highlights differences with respect to ecoregion-specific carbon cycle responses to drought and heat. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113672
Appears in Collections:气候减缓与适应

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作者单位: International Institute for Earth System Science, Nanjing University, Nanjing, China; Center for Isotope Research (CIO), Energy and Sustainability Research Institute Groningen, University of Groningen, Groningen, Netherlands; Jiangsu Center for Collaborative Innovation in Geographic Information Resource Development and Application, Nanjing, China; Woods Hole Research Center, Falmouth, MA, United States; Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ, United States; Norwegian Institute of Bioeconomy Research, Ås, Norway; Department of Microbiology and Plant Biology, Center for Spatial Analysis, University of Oklahoma, Norman, OK, United States; School of Urban and Environmental Sciences, Huaiyin Normal University, Huaian, China; School of Resources and Environmental Engineering, Ludong University, Yantai, China; College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom; Laboratoire des Sciences du Climat et de l'Environnement, CEA CNRS UVSQ, Gif-sur-Yvette, France; Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States

Recommended Citation:
He W.,Ju W.,Schwalm C.R.,et al. Large-Scale Droughts Responsible for Dramatic Reductions of Terrestrial Net Carbon Uptake Over North America in 2011 and 2012[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(7)
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