Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 8 2009 10.5194/bg-6-1389-2009 http://www.biogeosciences.net/6/1389/2009/ http://www.biogeosciences.net/6/1389/2009/bg-6-1389-2009.html http://www.biogeosciences.net/6/1389/2009/bg-6-1389-2009.pdf 1389 1404 2009-08-05 Modelling LAI at a regional scale with ISBA-A-gs: comparison with satellite-derived LAI over southwestern France A. Brut C. Rüdiger S. Lafont J.-L. Roujean J.-C. Calvet calvet@meteo.fr L. Jarlan A.-L. Gibelin C. Albergel P. Le Moigne J.-F. Soussana K. Klumpp D. Guyon J.-P. Wigneron E. Ceschia CNRM/GAME (Météo-France, CNRS), Toulouse, France LSCE (CEA, CNRS), Gif-sur-Yvette, France Unité de Recherche sur l'Ecosystème Prairial (INRA), Clermont-Ferrand, France Unité de recherche Ecologie fonctionnelle et Physique de l'Environnement (INRA), Villenave d'Ornon, France CESBIO (UPS, CNRS, IRD, CNES), Toulouse, France now at: CESBIO (UPS, CNRS, IRD, CNES), Toulouse, France now at: Department of Civil and Environmental Engineering, The University of Melbourne, Melbourne, Australia A CO₂-responsive land surface model (the ISBA-A-gs model of Météo-France) is used to simulate photosynthesis and Leaf Area Index (LAI) in southwestern France for a 3-year period (2001–2003). A domain of about 170 000 km² is covered at a spatial resolution of 8 km. The capability of ISBA-A-gs to reproduce the seasonal and the interannual variability of LAI at a regional scale, is assessed with satellite-derived LAI products. One originates from the CYCLOPES programme using SPOT/VEGETATION data, and two products are based on MODIS data. The comparison reveals discrepancies between the satellite LAI estimates and between satellite and simulated LAI values, both in their intensity and in the timing of the leaf onset. The model simulates higher LAI values for the C3 crops than the satellite observations, which may be due to a saturation effect within the satellite signal or to uncertainties in model parameters. The simulated leaf onset presents a significant delay for C3 crops and mountainous grasslands. In-situ observations at a mid-altitude grassland site show that the generic temperature response of photosynthesis used in the model is not appropriate for plants adapted to the cold climatic conditions of the mountainous areas. 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