Impact of mesophyll diffusion on estimated global land CO 2 fertilization

Proceedings of the National Academy of Sciences of the United States of America - Tập 111 Số 44 - Trang 15774-15779 - 2014
Ying Sun1, Lianhong Gu2, Robert E. Dickinson1, Richard J. Norby2, Stephen G. Pallardy3, F. M. Hoffman4
1Department of Geological Sciences, University of Texas at Austin, Austin, TX 78712;
2Environmental Sciences Division and Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37831;
3Department of Forestry, University of Missouri, Columbia, MO 65211; and
4Climate Change Science Institute and Computational Earth Sciences Group, Oak Ridge National Laboratory, Oak Ridge, TN 37831

Tóm tắt

Significance Understanding and accurately predicting how global terrestrial primary production responds to rising atmospheric CO 2 concentrations is a prerequisite for reliably assessing the long-term climate impact of anthropogenic fossil CO 2 emissions. Here we demonstrate that current carbon cycle models underestimate the long-term responsiveness of global terrestrial productivity to CO 2 fertilization. This underestimation of CO 2 fertilization is caused by an inherent model structural deficiency related to lack of explicit representation of CO 2 diffusion inside leaves, which results in an overestimation of CO 2 available at the carboxylation site. The magnitude of CO 2 fertilization underestimation matches the long-term positive growth bias in the historical atmospheric CO 2 predicted by Earth system models. Our study will lead to improved understanding and modeling of carbon–climate feedbacks.

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Proceedings of the National Academy of Sciences of the United States of America

Tập 111 Số 44

15774-15779

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