{
  "abstract": "Nitrogen (N) is a critical nutrient, that controls photosynthesis and decomposition processes. It is important to include the N cycle in the land component of climate models to improve the exchange fluxes of CO 2 between land and atmosphere. We present here the implementation of the N cycle in the CNRM land surface model, namely ISBA. We evaluate the model on two Free-Air Enrichment (FACE), experiments sites: Duke and Oak Ridge. In particular, the response to elevated CO 2 is studied. We compare the reference version without the N cycle (C) and the new version in which it is included (CN). A comparison to a multi model analysis shows encouraging results, since the computed NPP and N assimilation flux fall in the inter model range. The CN version performs better than the C version for NPP. Next, we focus on the carbon cycle by comparing simulation results to observations. The CN version improves the carbon stocks, largely overestimated by the C version. In particular, at elevated CO 2 , in the CN version, photosynthesis is downregulated by the N limitation. This yields a reduction of C accumulation in soil and biomass in comparison to the C version. In the literature, diverging strategies are observed to overcome N limitation. The model reproduces well the main features but fails to represent some sites characteristics. Finally, a detailed analysis of the simulated N dynamics is presented.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 4,
  "authors": [
    {
      "name": "Jeanne Decayeux"
    },
    {
      "name": "Bertrand Decharme"
    },
    {
      "name": "Romain Darnajoux"
    },
    {
      "name": "Christine Delire"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0527n3r3yrmpx.bib",
  "cited_by": 1,
  "doi": "10.5194/gmd-19-7787-2026",
  "fulltext_url": null,
  "id": "0527n3r3yrmpx",
  "issns": [
    "1991-9603",
    "1991-959X"
  ],
  "landing_url": "https://hal.science/hal-05749063v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.sde"
    ],
    [
      "openalex",
      "1111|Soil Carbon and Nitrogen Dynamics"
    ]
  ],
  "openalex": "W7153134501",
  "pdf_url": "https://hal.science/hal-05749063/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-21",
  "publisher": "European Geosciences Union",
  "ris": "https://research.draconitic.com/paper/0527n3r3yrmpx.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:36Z",
      "native_id": "hal-05749063",
      "source": "hal",
      "url": "https://hal.science/hal-05749063v1"
    }
  ],
  "subjects": [
    {
      "field": "earth",
      "origin": "hal:0.sde",
      "subfield": "environmental-science"
    }
  ],
  "title": "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 2 Enrichment experiment sites",
  "title_text": "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 2 Enrichment experiment sites",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:36Z",
  "url": "https://research.draconitic.com/paper/0527n3r3yrmpx",
  "venue": "Geoscientific Model Development",
  "versions": []
}