globalchange  > 气候变化与战略
DOI: 10.1111/gcb.14917
State of the science in reconciling top-down and bottom-up approaches for terrestrial CO2 budget
Author: Kondo M.; Patra P.K.; Sitch S.; Friedlingstein P.; Poulter B.; Chevallier F.; Ciais P.; Canadell J.G.; Bastos A.; Lauerwald R.; Calle L.; Ichii K.; Anthoni P.; Arneth A.; Haverd V.; Jain A.K.; Kato E.; Kautz M.; Law R.M.; Lienert S.; Lombardozzi D.; Maki T.; Nakamura T.; Peylin P.; Rödenbeck C.; Zhuravlev R.; Saeki T.; Tian H.; Zhu D.; Ziehn T.
Source Publication: Global Change Biology
ISSN: 13541013
Publishing Year: 2020
Volume: 26, Issue:3
Language: 英语
Keyword: atmospheric inversion ; biosphere model ; carbon stock change ; CO2 evasion ; land-use change emissions ; net CO2 flux ; residual land uptake ; riverine carbon export ; terrestrial CO2 budget
English Abstract: Robust estimates of CO2 budget, CO2 exchanged between the atmosphere and terrestrial biosphere, are necessary to better understand the role of the terrestrial biosphere in mitigating anthropogenic CO2 emissions. Over the past decade, this field of research has advanced through understanding of the differences and similarities of two fundamentally different approaches: “top-down” atmospheric inversions and “bottom-up” biosphere models. Since the first studies were undertaken, these approaches have shown an increasing level of agreement, but disagreements in some regions still persist, in part because they do not estimate the same quantity of atmosphere–biosphere CO2 exchange. Here, we conducted a thorough comparison of CO2 budgets at multiple scales and from multiple methods to assess the current state of the science in estimating CO2 budgets. Our set of atmospheric inversions and biosphere models, which were adjusted for a consistent flux definition, showed a high level of agreement for global and hemispheric CO2 budgets in the 2000s. Regionally, improved agreement in CO2 budgets was notable for North America and Southeast Asia. However, large gaps between the two methods remained in East Asia and South America. In other regions, Europe, boreal Asia, Africa, South Asia, and Oceania, it was difficult to determine whether those regions act as a net sink or source because of the large spread in estimates from atmospheric inversions. These results highlight two research directions to improve the robustness of CO2 budgets: (a) to increase representation of processes in biosphere models that could contribute to fill the budget gaps, such as forest regrowth and forest degradation; and (b) to reduce sink–source compensation between regions (dipoles) in atmospheric inversion so that their estimates become more comparable. Advancements on both research areas will increase the level of agreement between the top-down and bottom-up approaches and yield more robust knowledge of regional CO2 budgets. © 2019 John Wiley & Sons Ltd
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Document Type: 期刊论文
Appears in Collections:气候变化与战略

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Affiliation: Center for Environmental Remote Sensing, Chiba University, Chiba, Japan; Department of Environmental Geochemical Cycle Research, Japan Agency for Marine–Earth Science and Technology, Yokohama, Japan; College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom; College of Engineering, Mathematics, and Physical Sciences, University of Exeter, Exeter, United Kingdom; Biospheric Science Laboratory, National Aeronautics and Space Administration Goddard Space Flight Center, Greenbelt, MD, United States; Laboratoire des Sciences du Climat et de l'Environnement, Institut Pierre Simon Laplace, Gif-sur-Yvette, France; Global Carbon Project, Commonwealth Scientific and Industrial Research Organisation–Oceans and Atmosphere, Canberra, ACT, Australia; Department of Geography, Ludwig–Maximilian University of Munich, Munich, Germany; Université Libre de Bruxelles, Bruxelles, Belgium; W.A. Franke College of Forestry & Conservation, University of Montana, Missoula, MT, United States; Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Japan; Institute of Meteorology and Climate Research/Atmospheric Environmental Research, Karlsruhe Institute of Technology, Garmisch-Partenkirchen, Germany; Commonwealth Scientific and Industrial Research Organisation–Oceans and Atmosphere, Canberra, ACT, Australia; Department of Atmospheric Sciences, University of Illinois at Urbana–Champaign, Urbana, IL, United States; Institute of Applied Energy, Tokyo, Japan; Department of Forest Health, Forest Research Institute Baden-Württemberg, Freiburg, Germany; Commonwealth Scientific and Industrial Research Organisation–Oceans and Atmosphere, Aspendale, Vic., Australia; Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Climate and Global Dynamics, National Center for Atmospheric Research, Boulder, CO, United States; Meteorological Research Institute, Tsukuba, Japan; Japan Meteorological Agency, Tokyo, Japan; Max Planck Institute for Biogeochemistry, Jena, Germany; Central Aerological Observatory of Russian Hydromet Service, Moscow, Russian Federation; International Center for Climate and Global Change Research, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL, United States

Recommended Citation:
Kondo M.,Patra P.K.,Sitch S.,et al. State of the science in reconciling top-down and bottom-up approaches for terrestrial CO2 budget[J]. Global Change Biology,2020-01-01,26(3)
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