HAL: hal-00648629, version 1

DOI: 10.5194/hess-15-603-2011

Detailed view

Export this paper BibTeX - EndNote - TEI - RefWorks -

Hydrology and Earth System Sciences and Discussions 15, 2 (2011) 603-616

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

Frédéric Baup 1, Eric Mougin 2, Patricia De Rosnay 1, 3, Pierre Hiernaux 2, Frédéric Frappart 2, Pierre-Louis Frison 4, Mehrez Zribi 1, Julien Viarre 2

For the AMMA, ESA Project ID 443 collaboration(s)

(2011-02-18)

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.

1:	Centre d'études spatiales de la biosphère (CESBIO)
	CNRS : UMR5126 – Institut de recherche pour le développement [IRD] – CNES – Observatoire Midi-Pyrénées – INSU – Université Paul Sabatier [UPS] - Toulouse III
2:	Géosciences Environnement Toulouse (GET)
	CNRS : UMR5563 – Institut de recherche pour le développement [IRD] : UMR239 – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées
3:	European Centre for Medium Range Weather Forecast (ECMWF)
	ECMWF
4:	Géomatériaux et Géologie de l'Ingénieur (G2I)
	Université Paris-Est Créteil Val-de-Marne (UPEC) – MINES ParisTech - École nationale supérieure des mines de Paris

Subject

:

Sciences of the Universe/Earth Sciences

hal-00648629, version 1

http://hal.archives-ouvertes.fr/hal-00648629

oai:hal.archives-ouvertes.fr:hal-00648629

From: Frédéric Frappart <>

Submitted on: Tuesday, 6 December 2011 10:44:50

Updated on: Wednesday, 7 December 2011 14:42:56