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Gruhier C., Rosnay de P., Kerr Yann, Mougin Eric, Ceschia E., Calvet J. C., Richaume P. Evaluation of AMSR-E soil moisture product based on ground measurements over temperate and semi-arid regions. Geophysical Research Letters, 2008, 35 (10), p. L10405. ISSN 0094-8276

Lien direct chez l'éditeur doi:10.1029/2008gl033330

En Libre Accès sur HAL http://hal.ird.fr/ird-00413233/en/

TitreEvaluation of AMSR-E soil moisture product based on ground measurements over temperate and semi-arid regions
Année de publication2008
Type de documentArticle référencé dans le Web of Science : 000256357600002
AuteursGruhier C., Rosnay de P., Kerr Yann, Mougin Eric, Ceschia E., Calvet J. C., Richaume P.
SourceGeophysical Research Letters, 2008, 35 (10), p. L10405. ISSN 0094-8276
RésuméSoil moisture (SM) products provided by remote sensing approaches at continental scale are of great importance for land surface modeling and numerical weather prediction. Before using remotely sensed SM products it is crucial to validate them. This paper presents an evaluation of AMSR-E (Advanced Microwave Scanning Radiometer-Earth Observing System) SM products over two sites. They are located in the south-west of France and in the Sahelian part of Mali in West Africa, in the framework of the SMOSREX (Surface Monitoring Of Soil Reservoir Experiment) and AMMA (African Monsoon Multidisciplinary Analysis) projects respectively. The most representative station of the four stations of each site is used for the comparison of AMSR-E derived and in-situ SM measurements in absolute and normalized values. Results suggest that, although AMSR-E SM product is not able to capture absolute SM values, it provides reliable information on surface SM temporal variability, at seasonal and rainy event scale. It is shown, however, that the use of radiometric products, such as polarization ratio, provides better agreement with ground stations than the derived SM products.
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