Contrasting effects of CO 2 fertilization, land-use change and warming on seasonal amplitude of Northern Hemisphere CO 2 exchange

Bastos, Ana; Ciais, Philippe; Chevallier, Frédéric; Rödenbeck, Christian; Ballantyne, Ashley P.; Maignan, Fabienne; Yin, Yi; Fernández-Martínez, Marcos; Friedlingstein, Pierre; Peñuelas, Josep; Piao, Shilong L.; Sitch, Stephen; Smith, William K.; Wang, Xuhui; Zhu, Zaichun; Haverd, Vanessa; Kato, Etsushi; Jain, Atul K.; Lienert, Sebastian; Lombardozzi, Danica; Nabel, Julia E. M. S.; Peylin, Philippe; Poulter, Benjamin; Zhu, Dan

Continuous atmospheric inline-formulaCO2 monitoring data indicate an increase in the amplitude of seasonal inline-formulaCO2-cycle exchange (inline-formulaSCANBP) in northern high latitudes. The major drivers of enhanced inline-formulaSCANBP remain unclear and intensely debated, with land-use change, inline-formulaCO2 fertilization and warming being identified as likely contributors. We integrated inline-formulaCO2-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 inline-formulaSCANBP of inline-formulaCO2 fluxes for 1980–2015. The LSMs generally reproduce the latitudinal increase in inline-formulaSCANBP trends within the inversions range. Inversions and LSMs attribute inline-formulaSCANBP increase to boreal Asia and Europe due to enhanced vegetation productivity (in LSMs) and point to contrasting effects of inline-formulaCO2 fertilization (positive) and warming (negative) on inline-formulaSCANBP. Our results do not support land-use change as a key contributor to the increase in inline-formulaSCANBP. The sensitivity of simulated microbial respiration to temperature in LSMs explained biases in inline-formulaSCANBP trends, which suggests that inline-formulaSCANBP could help to constrain model turnover times.



Bastos, Ana / Ciais, Philippe / Chevallier, Frédéric / et al: Contrasting effects of CO2 fertilization, land-use change and warming on seasonal amplitude of Northern Hemisphere CO2 exchange. 2019. Copernicus Publications.


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