A derivation error that affects carbon balance models exists in the current implementation of the modified Arrhenius function
Copyright policy )A derivation error that affects carbon balance models exists in the current implementation of the modified Arrhenius function
Summary Understanding biological temperature responses is crucial to predicting global carbon fluxes. The current approach to modelling temperature responses of photosynthetic capacity in large scale modelling efforts uses a modified Arrhenius equation. We rederived the modified Arrhenius equation from the source publication from 1942 and uncovered a missing term that was dropped by 2002. We compare fitted temperature response parameters between the correct and incorrect derivation of the modified Arrhenius equation. We find that most parameters are minimally affected, though activation energy is impacted quite substantially. We then scaled the impact of these small errors to whole plant carbon balance and found that the impact of the rederivation of the modified Arrhenius equation on modelled daily carbon gain causes a meaningful deviation of c. 18% day −1 . This suggests that the error in the derivation of the modified Arrhenius equation has impacted the accuracy of predictions of carbon fluxes at larger scales since > 40% of Earth System Models contain the erroneous derivation. We recommend that the derivation error be corrected in modelling efforts moving forward.
- University of Toronto Canada
- University of New Mexico United States
- Department of Biology United States
- Western University Canada
- University of New Mexico, Department of Biology United States
Plant Leaves, Temperature, Carbon Dioxide, Photosynthesis, Models, Biological, Carbon, Carbon Cycle
Plant Leaves, Temperature, Carbon Dioxide, Photosynthesis, Models, Biological, Carbon, Carbon Cycle
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