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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Sun, Ying Gu, Lianhong Pallardy, Stephen G. Hoffman, Forrest M. Norby, Richard J. Dickinson, Robert E. |
| Description | Author Affiliation: Sun Y ( Department of Geological Sciences, University of Texas at Austin, Austin, TX 78712); Gu L ( Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37831); Dickinson RE ( Department of Geological Sciences, University of Texas at Austin, Austin, TX 78712); Norby RJ ( Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37831); Pallardy SG ( Department of Forestry, University of Missouri, Columbia, MO 65211); Hoffman FM ( Climate Change Science Institute and Computational Earth Sciences Group, Oak Ridge National Laboratory, Oak Ridge, TN 37831.); |
| Abstract | In $C_{3}$ plants, $CO_{2}$ concentrations drop considerably along mesophyll diffusion pathways from substomatal cavities to chloroplasts where $CO_{2}$ assimilation occurs. Global carbon cycle models have not explicitly represented this internal drawdown and therefore overestimate $CO_{2}$ available for carboxylation and underestimate photosynthetic responsiveness to atmospheric $CO_{2}.$ An explicit consideration of mesophyll diffusion increases the modeled cumulative $CO_{2}$ fertilization effect (CFE) for global gross primary production (GPP) from 915 to 1,057 PgC for the period of 1901–2010. This increase represents a 16% correction, which is large enough to explain the persistent overestimation of growth rates of historical atmospheric $CO_{2}$ by Earth system models. Without this correction, the CFE for global GPP is underestimated by 0.05 PgC/y/ppm. This finding implies that the contemporary terrestrial biosphere is more $CO_{2}$ limited than previously thought. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 44 |
| Volume Number | 111 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2014-11-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Atmosphere Carbon Dioxide Metabolism Chloroplasts Models, Theoretical Plants Chemistry Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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