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Article Dans Une Revue Hydrology and Earth System Sciences Discussions Année : 2011

Mapping surface soil moisture over the Gourma mesoscale site (Mali) by using ENVISAT ASAR data

Résumé

The potentialities of ENVISAT ASAR (Advanced Synthetic Aperture Radar) multi-angle data for mapping surface soil moisture (SSM) in Sahelian rangelands are investigated at medium scale (30 000 km2). The Wide Swath data are selected to take advantage of their high temporal repetitivity (about 8 days at the considered scale) associated to a moderate spatial resolution (150 m). In the continuity of previous studies conducted at a local scale in the same region, SSM maps are here processed over the whole AMMA Gourma mesoscale site at 1 km resolution scale. Overall, the generated maps are found to be in good agreement with field data, EPSAT-SG (Estimation des Pluies par SATellite - Second Generation) rainfall estimates and ERS (European Remote Sensing) Wind Scatterometer (WSC) SSM products. The present study shows that the spatial pattern of SSM can be realistically estimated at a kilometric scale. The resulting SSM maps are expected to provide valuable information for initialisation of land surface models and the estimation of the spatial distribution of radiative fluxes. Particularly, SSM maps could help to desaggregate low-resolution products such as those derived from WSC data.
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Dates et versions

hal-00648629 , version 1 (06-12-2011)

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Frédéric Baup, Éric Mougin, Patricia de Rosnay, Pierre Hiernaux, Frédéric Frappart, et al.. Mapping surface soil moisture over the Gourma mesoscale site (Mali) by using ENVISAT ASAR data. Hydrology and Earth System Sciences Discussions, 2011, 15 (2), pp.603-616. ⟨10.5194/hess-15-603-2011⟩. ⟨hal-00648629⟩
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