DocumentCode :
1017118
Title :
A Method for Soil Moisture Estimation in Western Africa Based on the ERS Scatterometer
Author :
Zribi, Mehrez ; André, C. ; Decharme, Bertrand
Author_Institution :
Centre d´´Etude des Environnements Terrestre et Planetaires (CETP), Centre Nat. de la Rech. Sci. (CNRS), Velizy
Volume :
46
Issue :
2
fYear :
2008
Firstpage :
438
Lastpage :
448
Abstract :
The analysis of feedback phenomena, which occur between continental surfaces and the atmosphere, is one of the keys to an improved understanding of African monsoon dynamics. For this reason, the monitoring of surface parameters, particularly soil moisture, is very important. This paper presents a new methodology for the estimation of surface soil moisture over Western Africa based on the data provided by the European Remote Sensing wind scatterometer instrument, in which an empirical model is used to estimate volumetric soil moisture. This approach takes into account the effects of vegetation and soil roughness in the soil moisture estimation process. The proposed estimations have been validated using different methods, and a good degree of coherence has been observed between satellite estimations and ground truth measurements over the Banizambou site in Niger. Moisture and rainfall estimations for the same site are shown to be strongly correlated. Comparison with the multimodel analysis product provided by the Global Soil Wetness Project, Phase 2, indicates that their estimations are well correlated, although land surface models provide slightly overestimated levels of soil moisture.
Keywords :
atmospheric boundary layer; hydrological techniques; moisture; rain; remote sensing by radar; soil; African monsoon dynamics; Banizambou; ERS scatterometer; ERS wind scatterometer instrument; European Remote Sensing; Global Soil Wetness Project Phase 2; Niger; continental surfaces; land-atmosphere feedback phenomena; rainfall; soil moisture estimation; soil roughness; surface parameter monitoring; vegetation; volumetric soil moisture; western Africa; Africa; Atmosphere; Condition monitoring; Feedback; Instruments; Land surface; Radar measurements; Remote monitoring; Soil moisture; Surface soil; European Remote Sensing (ERS) scatterometer; Western Africa; inversion; radar; soil moisture;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/TGRS.2007.904582
Filename :
4407744
Link To Document :
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