Contrasting effects of CO2 fertilization, land-use change and warming on seasonal amplitude of Northern Hemisphere CO2 exchange
Bastos, Ana (Ludwig-Maximilians-Universität. Department of Geography)
Ciais, Philippe (Université Paris-Saclay. Laboratoire des Sciences du Climat et de l'Environnement)
Chevallier, Frédéric (Université Paris-Saclay. Laboratoire des Sciences du Climat et de l'Environnement)
Rödenbeck, Christian (Max Planck Institute for Biogeochemistry)
Ballantyne, Ashley P. (University of Montana. Department of Ecosystem and Conservation Sciences)
Maignan, Fabienne (Université Paris-Saclay. Laboratoire des Sciences du Climat et de l'Environnement)
Yin, Yi (California Institute of Technology. Division of Geological & Planetary Sciences)
Fernández-Martínez, Marcos (University of Antwerp. Department of Biology.)
Friedlingstein, Pierre (University of Exeter. Mathematics and Physical Sciences)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Piao, Shilong L. (Peking University. College of Urban and Environmental Sciences)
Sitch, Stephen (University of Exeter. College of Life and Environmental Sciences)
Smith, William K. (School of Natural Resources and the Environment. University of Arizona)
Wang, Xuhui (Université Paris-Saclay. Laboratoire des Sciences du Climat et de l'Environnement)
Zhu, Zaichun (Peking University. School of Urban Planning and Design)
Haverd, Vanessa (CSIRO Oceans and Atmosphere)
Kato, Etsushi (Institute of Applied Energy (IAE))
Jain, Atul (University of Illinois. Department of Atmospheric Sciences)
Lienert, Sebastian (University of Bern. Climate and Environmental Physics)
Lombardozzi, Danica (National Center for Atmospheric Research. Climate and Global Dynamics Laboratory)
Nabel, Julia E. M. S. (Max Planck Institute for Meteorology)
Peylin, Philippe (Laboratoire des Sciences du Climat et de l'Environnement. LSCE. IPSL. CEA-CNRS-UVSQ. Université Paris-Saclay)
Poulter, Benjamin (Goddard Space Flight Center. Biospheric Sciences Laboratory. NASA)
Zhu, Dan (Université Paris-Saclay. Laboratoire des Sciences du Climat et de l'Environnement)

Data:	2019
Resum:	Continuous atmospheric CO monitoring data indicate an increase in the amplitude of seasonal CO-cycle exchange (SCA) in northern high latitudes. The major drivers of enhanced SCA remain unclear and intensely debated, with land-use change, CO fertilization and warming being identified as likely contributors. We integrated CO-flux data from two atmospheric inversions (consistent with atmospheric records) and from 11 state-of-the-art land-surface models (LSMs) to evaluate the relative importance of individual contributors to trends and drivers of the SCA of CO fluxes for 1980-2015. The LSMs generally reproduce the latitudinal increase in SCA trends within the inversions range. Inversions and LSMs attribute SCA increase to boreal Asia and Europe due to enhanced vegetation productivity (in LSMs) and point to contrasting effects of CO fertilization (positive) and warming (negative) on SCA. Our results do not support land-use change as a key contributor to the increase in SCA. The sensitivity of simulated microbial respiration to temperature in LSMs explained biases in SCA trends, which suggests that SCA could help to constrain model turnover times.
Nota:	Altres ajuts: European Space Agency Climate Change Initiative/ESRIN/ 4000123002/18/I-NB
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Atmospheric chemistry and physics, Vol. 19, Issue 19 (October 2019) , p. 12361-12375, ISSN 1680-7324

DOI: 10.5194/acp-19-12361-2019

15 p, 1.5 MB

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