Geosci. Model Dev. Discuss., 4, 2365-2415, 2011
© Author(s) 2011. This work is distributed
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This discussion paper has been under review for the journal Geoscientific Model Development (GMD). Please refer to the corresponding final paper in GMD.
The detailed snowpack scheme Crocus and its implementation in SURFEX v7
V. Vionnet1, E. Brun1, S. Morin2, A. Boone1, S. Faroux1, P. Le Moigne1, E. Martin1, and J.-M. Willemet2
1Météo-France/CNRS, CNRM – GAME URA 1357, Toulouse, France
2Météo-France/CNRS, CNRM – GAME URA 1357, CEN, St. Martin-d'Hères, France

Abstract. Detailed studies of snow cover processes require models that offer a fine description of the snow cover properties. The detailed snowpack model Crocus is such a scheme, and has been run operationally for avalanche forecasting over the French mountains for 20 years. It is also used for climate or hydrological studies. To extend its potential applications, Crocus has been recently integrated within the framework of the externalized surface module SURFEX. SURFEX computes the exchanges of energy and mass between different types of surface, and the atmosphere and includes in particular the land surface scheme ISBA (Interactions between Soil, Biosphere, and Atmosphere). It allows Crocus to be run either in stand-alone mode, using a time series of forcing meteorological data or in fully coupled mode (explicit or fully implicit numerics) with atmospheric models ranging from meso-scale models to general circulation models. This approach also insures a full coupling between the snow cover and the soil beneath. Several applications of this new simulation platform are presented. They range from a 1D stand-alone simulation (Col de Porte, France) to fully-distributed simulations in complex terrain, either in forced mode over a whole mountain range (Massif des Grandes Rousses, France), or in coupled mode such as a snow transport simulation (Col du Lac Blanc, France), or a surface energy balance and boundary layer simulation over a polar ice cap (Dome C, Antarctica).

Citation: Vionnet, V., Brun, E., Morin, S., Boone, A., Faroux, S., Le Moigne, P., Martin, E., and Willemet, J.-M.: The detailed snowpack scheme Crocus and its implementation in SURFEX v7, Geosci. Model Dev. Discuss., 4, 2365-2415, doi:10.5194/gmdd-4-2365-2011, 2011.
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