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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model evaluation paper 02 Mar 2020

Submitted as: model evaluation paper | 02 Mar 2020

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A revised version of this preprint is currently under review for the journal GMD.

The Latest Improvements in SURFEX v8.0 of the Safran-Isba-Modcou Hydrometeorological Model over France

Patrick Le Moigne1, François Besson2, Eric Martin1,3, Julien Boé4, Bertrand Decharme1, Pierre Etchevers2, Stéphanie Faroux1, Florence Habets5, Matthieu Lafaysse6, Delphine Leroux1, and Fabienne Rousset-Regimbeau2 Patrick Le Moigne et al.
  • 1CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France
  • 2Direction de la Climatologie et des Services Climatiques, Météo-France, Toulouse, France
  • 3Irstea, Université d’Aix Marseille, RECOVER, Aix-en-Provence, France
  • 4CECI, Université de Toulouse, CERFACS, CNRS, Toulouse, France
  • 5CNRS UMR 8538, Laboratoire de Géologie, Ecole Normale Supérieure, PSL Research University, 24 rue Lhomond, 75005 Paris, France
  • 6CNRM, Université de Grenoble, Météo-France, CNRS, Grenoble, France

Abstract. The Safran-Isba-Modcou (SIM) hydrometeorological system was developed and put into operations at Meteo-France in the early 2000's. SIM application is devoted to water resource monitoring, and therefore can help monitoring drought or forecasting flood risks over French territory. This complex system combines three models: SAFRAN analysis of near-surface meteorological variables, ISBA land surface model which aims at computing surface fluxes at the interface with the atmosphere and soil variables, and finally MODCOU a hydrogeological model which calculates river discharges and groundwater level evolutions. SIM model was improved first by reducing the SAFRAN infrared radiation bias, then by using the more advanced multi-layer diffusion surface scheme of ISBA to have a more physical representation of the surface and soil processes. At the same time more accurate and up-to-date input databases for vegetation, soil texture and orography were used and finally in mountainous areas a subgrid representation of the orography using elevation bands was adopted as well as the possibility to add a reservoir to represent the effect of aquifers in mountains. SIM model was run for a 60y period from 1958 to 2018. The present paper describes the changes and demonstrates that the SIM new version performs better than the previous one by comparing a set of selected simulations to measurements of daily streamflow and observations of snow depths.

Patrick Le Moigne et al.

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Patrick Le Moigne et al.

Patrick Le Moigne et al.


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Latest update: 01 Jun 2020
Publications Copernicus
Short summary
The study describes how a hydrometeorological model, operational at Meteo-France, was improved. In particular, focus is made on the impact of climate data, surface and soil parameterizations on the model results. Model simulations and the evaluations performed on a various set of measurements of river discharges, snow depths, soil temperatures, are presented. All improvements in terms of climate, surface data and model physics have a positive impact on the system performances.
The study describes how a hydrometeorological model, operational at Meteo-France, was improved....