Impact of mesophyll diffusion on estimated global land CO2 fertilization
Abstract
In C3 plants, CO2 concentrations drop considerably along mesophyll diffusion pathways from substomatal cavities to chloroplasts where CO2 assimilation occurs. Global carbon cycle models have not explicitly represented this internal drawdown and so overestimate CO2 available for carboxylation and underestimate photosynthetic responsiveness to atmospheric CO2. An explicit consideration of mesophyll diffusion increases the modeled cumulative CO2 fertilization effect (CFE) for global gross primary production (GPP) from 915 PgC to 1057 PgC for the period of 1901 to 2010. This increase represents a 16% correction, large enough to explain the persistent overestimation of growth rates of historical atmospheric CO2 by Earth System Models. Without this correction, the CFE for global GPP is underestimated by 0.05 PgC yr-1ppm-1. This finding implies that the contemporary terrestrial biosphere is more CO2-limited than previously thought.
- Authors:
-
- Univ. of Texas at Austin, Austin, TX (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Missouri, Columbia, MO (United States). Dept. of Forestry
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Institute and Computational Earth Sciences Group
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1160002
- Grant/Contract Number:
- FG02- 01ER64746; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Volume: 111; Journal Issue: 44; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; Mesophyll conductance; CO₂ fertilization; carbon cycle; gross primary 42 production; photosynthetic model
Citation Formats
Sun, Ying, Gu, Lianhong, Dickinson, Robert E., Norby, Richard J., Pallardy, Stephen G., and Hoffman, Forrest M. Impact of mesophyll diffusion on estimated global land CO2 fertilization. United States: N. p., 2014.
Web. doi:10.1073/pnas.1418075111.
Sun, Ying, Gu, Lianhong, Dickinson, Robert E., Norby, Richard J., Pallardy, Stephen G., & Hoffman, Forrest M. Impact of mesophyll diffusion on estimated global land CO2 fertilization. United States. https://doi.org/10.1073/pnas.1418075111
Sun, Ying, Gu, Lianhong, Dickinson, Robert E., Norby, Richard J., Pallardy, Stephen G., and Hoffman, Forrest M. Mon .
"Impact of mesophyll diffusion on estimated global land CO2 fertilization". United States. https://doi.org/10.1073/pnas.1418075111. https://www.osti.gov/servlets/purl/1160002.
@article{osti_1160002,
title = {Impact of mesophyll diffusion on estimated global land CO2 fertilization},
author = {Sun, Ying and Gu, Lianhong and Dickinson, Robert E. and Norby, Richard J. and Pallardy, Stephen G. and Hoffman, Forrest M.},
abstractNote = {In C3 plants, CO2 concentrations drop considerably along mesophyll diffusion pathways from substomatal cavities to chloroplasts where CO2 assimilation occurs. Global carbon cycle models have not explicitly represented this internal drawdown and so overestimate CO2 available for carboxylation and underestimate photosynthetic responsiveness to atmospheric CO2. An explicit consideration of mesophyll diffusion increases the modeled cumulative CO2 fertilization effect (CFE) for global gross primary production (GPP) from 915 PgC to 1057 PgC for the period of 1901 to 2010. This increase represents a 16% correction, large enough to explain the persistent overestimation of growth rates of historical atmospheric CO2 by Earth System Models. Without this correction, the CFE for global GPP is underestimated by 0.05 PgC yr-1ppm-1. This finding implies that the contemporary terrestrial biosphere is more CO2-limited than previously thought.},
doi = {10.1073/pnas.1418075111},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 44,
volume = 111,
place = {United States},
year = {Mon Oct 13 00:00:00 EDT 2014},
month = {Mon Oct 13 00:00:00 EDT 2014}
}
Web of Science
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