TY - JOUR
T1 - Inferring CO2fertilization effect based on global monitoring land-atmosphere exchange with a theoretical model
AU - Ueyama, Masahito
AU - Ichii, Kazuhito
AU - Kobayashi, Hideki
AU - Kumagai, Tomo'omi
AU - Beringer, Jason
AU - Merbold, Lutz
AU - Euskirchen, Eugénie S.
AU - Hirano, Takashi
AU - Marchesini, Luca Belelli
AU - Baldocchi, Dennis
AU - Saitoh, Taku M.
AU - Mizoguchi, Yasuko
AU - Ono, Keisuke
AU - Kim, Joon
AU - Varlagin, Andrej
AU - Kang, Minseok
AU - Shimizu, Takanori
AU - Kosugi, Yoshiko
AU - Bret-Harte, M. Syndonia
AU - MacHimura, Takashi
AU - Matsuura, Yojiro
AU - Ohta, Takeshi
AU - Takagi, Kentaro
AU - Takanashi, Satoru
AU - Yasuda, Yukio
PY - 2020/8
Y1 - 2020/8
N2 - Rising atmospheric CO2 concentration ([CO2]) enhances photosynthesis and reduces transpiration at the leaf, ecosystem, and global scale via the CO2 fertilization effect. The CO2 fertilization effect is among the most important processes for predicting the terrestrial carbon budget and future climate, yet it has been elusive to quantify. For evaluating the CO2 fertilization effect on land photosynthesis and transpiration, we developed a technique that isolated this effect from other confounding effects, such as changes in climate, using a noisy time series of observed land-atmosphere CO2 and water vapor exchange. Here, we evaluate the magnitude of this effect from 2000 to 2014 globally based on constraint optimization of gross primary productivity (GPP) and evapotranspiration in a canopy photosynthesis model over 104 global eddy-covariance stations. We found a consistent increase of GPP (0.138 ± 0.007% ppm-1; percentile per rising ppm of [CO2]) and a concomitant decrease in transpiration (-0.073% ± 0.006% ppm-1) due to rising [CO2]. Enhanced GPP from CO2 fertilization after the baseline year 2000 is, on average, 1.2% of global GPP, 12.4 g C m-2 yr-1 or 1.8 Pg C yr-1 at the years from 2001 to 2014. Our result demonstrates that the current increase in [CO2] could potentially explain the recent land CO2 sink at the global scale.
AB - Rising atmospheric CO2 concentration ([CO2]) enhances photosynthesis and reduces transpiration at the leaf, ecosystem, and global scale via the CO2 fertilization effect. The CO2 fertilization effect is among the most important processes for predicting the terrestrial carbon budget and future climate, yet it has been elusive to quantify. For evaluating the CO2 fertilization effect on land photosynthesis and transpiration, we developed a technique that isolated this effect from other confounding effects, such as changes in climate, using a noisy time series of observed land-atmosphere CO2 and water vapor exchange. Here, we evaluate the magnitude of this effect from 2000 to 2014 globally based on constraint optimization of gross primary productivity (GPP) and evapotranspiration in a canopy photosynthesis model over 104 global eddy-covariance stations. We found a consistent increase of GPP (0.138 ± 0.007% ppm-1; percentile per rising ppm of [CO2]) and a concomitant decrease in transpiration (-0.073% ± 0.006% ppm-1) due to rising [CO2]. Enhanced GPP from CO2 fertilization after the baseline year 2000 is, on average, 1.2% of global GPP, 12.4 g C m-2 yr-1 or 1.8 Pg C yr-1 at the years from 2001 to 2014. Our result demonstrates that the current increase in [CO2] could potentially explain the recent land CO2 sink at the global scale.
UR - http://www.scopus.com/inward/record.url?scp=85088889852&partnerID=8YFLogxK
U2 - 10.1088/1748-9326/ab79e5
DO - 10.1088/1748-9326/ab79e5
M3 - Article
AN - SCOPUS:85088889852
SN - 1748-9318
VL - 15
JO - Environmental Research Letters
JF - Environmental Research Letters
IS - 8
M1 - 084009
ER -