Optimizing the carbonic anhydrase temperature response and stomatal conductance of carbonyl sulfide leaf uptake in the Simple Biosphere model (SiB4)

Cho, Ara; Kooijmans, Linda M. J.; Kohonen, Kukka-Maaria; Wehr, Richard; Krol, Maarten C.

doi:https://doi.org/10.5194/bg-20-2573-2023

Articles | Volume 20, issue 13

https://doi.org/10.5194/bg-20-2573-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-20-2573-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 13

Research article

|

05 Jul 2023

Research article |

| 05 Jul 2023

Optimizing the carbonic anhydrase temperature response and stomatal conductance of carbonyl sulfide leaf uptake in the Simple Biosphere model (SiB4)

Ara Cho, Linda M. J. Kooijmans, Kukka-Maaria Kohonen, Richard Wehr, and Maarten C. Krol

Model code and software

Simple Biosphere Model Version 4.2 SiB4 project members https://gitlab.com/kdhaynes/sib4v2_corral

TM5-4DVAR base model code M. C. Krol, P. le Seger, and A. J. Segers https://sourceforge.net/projects/tm5/

Short summary

Carbonyl sulfide (COS) is a useful constraint for estimating photosynthesis. To simulate COS leaf flux better in the SiB4 model, we propose a novel temperature function for enzyme carbonic anhydrase (CA) activity and optimize conductances using observations. The optimal activity of CA occurs below 40 °C, and Ball–Woodrow–Berry parameters are slightly changed. These reduce/increase uptakes in the tropics/higher latitudes and contribute to resolving discrepancies in the COS global budget.