Assessment of the impacts of biological nitrogen fixation structural uncertainty in CMIP6 earth system models

Davies-Barnard, Taraka; Zaehle, Sönke; Friedlingstein, Pierre

doi:https://doi.org/10.5194/bg-19-3491-2022

Articles | Volume 19, issue 14

https://doi.org/10.5194/bg-19-3491-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-19-3491-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 14

Research article

|

27 Jul 2022

Research article |

| 27 Jul 2022

Assessment of the impacts of biological nitrogen fixation structural uncertainty in CMIP6 earth system models

Taraka Davies-Barnard, Sönke Zaehle, and Pierre Friedlingstein

Supplement

https://doi.org/10.5194/bg-19-3491-2022-supplement

Data sets

Assessment of the impacts of biological nitrogen fixation structural uncertainty in CMIP6 earth system models T. Davies-Barnard, S. Zaehle, and P. Friedlingstein https://doi.org/10.24378/exe.4085

Download

Article (1011 KB)
Full-text XML

Short summary

Biological nitrogen fixation is the largest natural input of new nitrogen onto land. Earth system models mainly represent global total terrestrial biological nitrogen fixation within observational uncertainties but overestimate tropical fixation. The model range of increase in biological nitrogen fixation in the SSP3-7.0 scenario is 3 % to 87 %. While biological nitrogen fixation is a key source of new nitrogen, its predictive power for net primary productivity in models is limited.