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Modelling Lai at a Regional Scale with Isba-a-gs: Comparison with Satellite-derived Lai Over Southwestern France : Volume 6, Issue 2 (08/04/2009)

By Brut, A.

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Book Id: WPLBN0004005235
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Modelling Lai at a Regional Scale with Isba-a-gs: Comparison with Satellite-derived Lai Over Southwestern France : Volume 6, Issue 2 (08/04/2009)  
Author: Brut, A.
Volume: Vol. 6, Issue 2
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Moigne, P. L., Lafont, S., Brut, A., Jarlan, L., Calvet, J., Gibelin, A.,...Klumpp, K. (2009). Modelling Lai at a Regional Scale with Isba-a-gs: Comparison with Satellite-derived Lai Over Southwestern France : Volume 6, Issue 2 (08/04/2009). Retrieved from

Description: CNRM/GAME (Météo-France, CNRS), Toulouse, France. 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 inter-annual variability of LAI at a regional scale, is assessed with two satellite-derived LAI products. One originates from the CYCLOPES programme using SPOT/VEGETATION data, and the second is based on MODIS data. The comparison reveals discrepancies between the two 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 and coniferous trees than the satellite observations, which may be due to a saturation effect within the satellite signal. The simulated leaf onset presents a significant delay for 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. This study demonstrates the potential of LAI remote sensing products for identifying and locating models' shortcomings at a regional scale.

Modelling LAI at a regional scale with ISBA-A-gs: comparison with satellite-derived LAI over southwestern France

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