Representation of the nitrogen cycle and its coupling with the carbon cycle in ISBA (SURFEX v9) the land surface model: evaluation using two Free-Air CO<sub>2</sub> Enrichment experiment sites

Decayeux, Jeanne; Decharme, Bertrand; Darnajoux, Romain; Delire, Christine

doi:10.5194/gmd-19-7787-2026

Articles | Volume 19, issue 16

https://doi.org/10.5194/gmd-19-7787-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

The externalised surface model SURFEX

https://doi.org/10.5194/gmd-19-7787-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 16

Development and technical paper

|

21 Aug 2026

Development and technical paper |

| 21 Aug 2026

Representation of the nitrogen cycle and its coupling with the carbon cycle in ISBA (SURFEX v9) the land surface model: evaluation using two Free-Air CO₂ Enrichment experiment sites

Jeanne Decayeux, Bertrand Decharme, Romain Darnajoux, and Christine Delire

Data sets

Representation of the nitrogen cycle and its coupling with the carbon cycle in ISBA (SURFEX v9) the land surface model: evaluation using two Free-Air CO2 Enrichment experiment sites Jeanne Decayeux https://doi.org/10.5281/zenodo.18459080

Short summary

The article describes the implementation of the nitrogen cycle in the land surface model ISBA (Interaction-Soil-Biosphere-Atmosphere). The model is evaluated using Free Air CO₂ Enrichment experiments. A comparison with a multi-model analysis shows that the nitrogen model version performs better than the carbon-only version, notably a reduced sensitivity to elevated CO₂, and smaller C stocks. We also present a detailed analysis of the simulated N dynamics in the soil.