Geoscientific Model Development
Geoscientific Model Development
GMD
Articles | Volume 19, issue 16
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:
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

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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.
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The externalised surface model SURFEX