globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13305
论文题名:
Regional atmospheric CO2 inversion reveals seasonal and geographic differences in Amazon net biome exchange
作者: Alden C.B.; Miller J.B.; Gatti L.V.; Gloor M.M.; Guan K.; Michalak A.M.; van der Laan-Luijkx I.T.; Touma D.; Andrews A.; Basso L.S.; Correia C.S.C.; Domingues L.G.; Joiner J.; Krol M.C.; Lyapustin A.I.; Peters W.; Shiga Y.P.; Thoning K.; van der Velde I.R.; van Leeuwen T.T.; Yadav V.; Diffenbaugh N.S.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期:10
起始页码: 3427
结束页码: 3443
语种: 英语
英文关键词: Amazon ; climate extremes ; CO 2 ; inverse model ; terrestrial biosphere ; tropical carbon exchange
Scopus关键词: biome ; biosphere ; carbon budget ; carbon dioxide ; climate change ; rainforest ; seasonal variation ; tropical environment ; Amazonia
英文摘要: Understanding tropical rainforest carbon exchange and its response to heat and drought is critical for quantifying the effects of climate change on tropical ecosystems, including global climate–carbon feedbacks. Of particular importance for the global carbon budget is net biome exchange of CO2 with the atmosphere (NBE), which represents nonfire carbon fluxes into and out of biomass and soils. Subannual and sub-Basin Amazon NBE estimates have relied heavily on process-based biosphere models, despite lack of model agreement with plot-scale observations. We present a new analysis of airborne measurements that reveals monthly, regional-scale (~1–8 × 106 km2) NBE variations. We develop a regional atmospheric CO2 inversion that provides the first analysis of geographic and temporal variability in Amazon biosphere–atmosphere carbon exchange and that is minimally influenced by biosphere model-based first guesses of seasonal and annual mean fluxes. We find little evidence for a clear seasonal cycle in Amazon NBE but do find NBE sensitivity to aberrations from long-term mean climate. In particular, we observe increased NBE (more carbon emitted to the atmosphere) associated with heat and drought in 2010, and correlations between wet season NBE and precipitation (negative correlation) and temperature (positive correlation). In the eastern Amazon, pulses of increased NBE persisted through 2011, suggesting legacy effects of 2010 heat and drought. We also identify regional differences in postdrought NBE that appear related to long-term water availability. We examine satellite proxies and find evidence for higher gross primary productivity (GPP) during a pulse of increased carbon uptake in 2011, and lower GPP during a period of increased NBE in the 2010 dry season drought, but links between GPP and NBE changes are not conclusive. These results provide novel evidence of NBE sensitivity to short-term temperature and moisture extremes in the Amazon, where monthly and sub-Basin estimates have not been previously available. © 2016 John Wiley & Sons Ltd
资助项目: This research was funded by grants from NASA (NNX12AM90G to JBM) and NSF (AGS CAREER 0955283 to NSD). We thank the pilots who collected the air samples, and the measurement analysts and scientists at NOAA for providing data from ASC and RPB. We also thank Sourish Basu and Tyler Jones for helpful discussions and two anonymous reviewers for thoughtful comments and suggestions.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61298
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Earth System Science, Stanford University, Stanford, CA, United States; Woods Institute for the Environment, Stanford University, Stanford, CA, United States; Global Monitoring Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO, United States; Instituto de Pesquisas Energéticas e Nucleares (IPEN)-Comissao Nacional de Energia Nuclear (CNEN)-Atmospheric Chemistry Laboratory, Cidade Universitaria, 2242 Avenida Professor Lineu Prestes, Sao Paulo, Brazil; School of Geography, University of Leeds, Woodhouse Lane, Leeds, United Kingdom; Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, United States; Department of Meteorology and Air Quality, Wageningen University, PO Box 47, Wageningen, Netherlands; National Aeronautics and Space Administration, Goddard Space Flight Center, Greenbelt, MD, United States; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Princetonplein 5, Utrecht, Netherlands; SRON Netherlands Institute for Space Research, Sorbonnelaan 2, Utrecht, Netherlands; University of Groningen, Centre for Isotope Research, Nijenborgh 4, Groningen, Netherlands; Department of Civil and Environmental Engineering, Stanford University, Stanford, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States

Recommended Citation:
Alden C.B.,Miller J.B.,Gatti L.V.,et al. Regional atmospheric CO2 inversion reveals seasonal and geographic differences in Amazon net biome exchange[J]. Global Change Biology,2016-01-01,22(10)
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