Decadal trends in the seasonal-cycle amplitude of terrestrial CO 2 exchange resulting from the ensemble of terrestrial biosphere models

Ito, Akihiko; Inatomi, Motoko; Huntzinger, Deborah N.; Schwalm, Christopher; Michalak, Anna M.; Cook, Robert; King, Anthony W.; Mao, Jiafu; Wei, Yaxing; Post, W. Mac; Wang, Weile; Arain, M. Altaf; Huang, Suo; Hayes, Daniel J.; Ricciuto, Daniel M.; Shi, Xiaoying; Huang, Maoyi; Lei, Huimin; Tian, Hanqin; Lu, Chaoqun; Yang, Jia; Tao, Bo; Jain, Atul; Poulter, Benjamin; Peng, Shushi; Ciais, Philippe; Fisher, Joshua B.; Parazoo, Nicholas; Schaefer, Kevin; Peng, Changhui; Zeng, Ning; Zhao, Fang

doi:10.3402/tellusb.v68.28968

Title: Decadal trends in the seasonal-cycle amplitude of terrestrial CO ₂ exchange resulting from the ensemble of terrestrial biosphere models

Journal Article · Thu May 12 00:00:00 EDT 2016 · Tellus, Series B: Chemical and Physical Meteorology

DOI:https://doi.org/10.3402/tellusb.v68.28968· OSTI ID:1327109

Ito, Akihiko; Inatomi, Motoko; Huntzinger, Deborah N.; Schwalm, Christopher; Michalak, Anna M.; Cook, Robert; King, Anthony W.; Mao, Jiafu; Wei, Yaxing; Post, W. Mac; Wang, Weile; Arain, M. Altaf; Huang, Suo; Hayes, Daniel J.; Ricciuto, Daniel M.; Shi, Xiaoying; Huang, Maoyi; Lei, Huimin; Tian, Hanqin; Lu, Chaoqun more »

The seasonal-cycle amplitude (SCA) of the atmosphere–ecosystem carbon dioxide (CO₂) exchange rate is a useful metric of the responsiveness of the terrestrial biosphere to environmental variations. It is unclear, however, what underlying mechanisms are responsible for the observed increasing trend of SCA in atmospheric CO₂ concentration. Using output data from the Multi-scale Terrestrial Model Intercomparison Project (MsTMIP), we investigated how well the SCA of atmosphere–ecosystem CO₂ exchange was simulated with 15 contemporary terrestrial ecosystem models during the period 1901–2010. Also, we made attempt to evaluate the contributions of potential mechanisms such as atmospheric CO₂, climate, land-use, and nitrogen deposition, through factorial experiments using different combinations of forcing data. Under contemporary conditions, the simulated global-scale SCA of the cumulative net ecosystem carbon flux of most models was comparable in magnitude with the SCA of atmospheric CO₂ concentrations. Results from factorial simulation experiments showed that elevated atmospheric CO₂ exerted a strong influence on the seasonality amplification. When the model considered not only climate change but also land-use and atmospheric CO₂ changes, the majority of the models showed amplification trends of the SCAs of photosynthesis, respiration, and net ecosystem production (+0.19 % to +0.50 % yr^-1). In the case of land-use change, it was difficult to separate the contribution of agricultural management to SCA because of inadequacies in both the data and models. The simulated amplification of SCA was approximately consistent with the observational evidence of the SCA in atmospheric CO₂ concentrations. Large inter-model differences remained, however, in the simulated global tendencies and spatial patterns of CO₂ exchanges. Further studies are required to identify a consistent explanation for the simulated and observed amplification trends, including their underlying mechanisms. Nevertheless, this study implied that monitoring of ecosystem seasonality would provide useful insights concerning ecosystem dynamics.

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Research Organization:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

DOE Contract Number:: AC05-76RL01830; AC05-00OR22725

OSTI ID:: 1327109

Report Number(s):: PNNL-SA-118566; KP1702030

Journal Information:: Tellus, Series B: Chemical and Physical Meteorology, Vol. 68, Issue 0; ISSN 0280-6509

Publisher:: Co-action Publishing

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
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Title: Decadal trends in the seasonal-cycle amplitude of terrestrial CO 2 exchange resulting from the ensemble of terrestrial biosphere models

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Title: Decadal trends in the seasonal-cycle amplitude of terrestrial CO ₂ exchange resulting from the ensemble of terrestrial biosphere models