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Article Dans Une Revue Geophysical Research Letters Année : 2008

Using spaceborne surface soil moisture to constrain satellite precipitation estimates over West Africa

Résumé

This paper describes a methodology to use the passive microwave measurements of the 6.9 GHz bandwidth of the AMSR-E sensor which is the most sensitive to surface soil moisture, to constrain satellite-based rainfall estimates over a semi arid region in West-Africa. The paper focuses on the aptitude of AMSR-E measurements to inform if rain occurs or not. The study was conducted over a 125x100 km² region located in Niger where a dense recording raingauge network is available to build an accurate ground-based 3-hour rainfall product at the 25x20 km² resolution. A satellite-based rainfall product (EPSAT-SG), based on both infrared and microwave measurements, was compared to the ground-based rainfall product. It was shown that EPSAT-SG overestimates by about 30 % the total number of rainy events during the 2004 and 2006 rainy seasons. A simple methodology based on the AMSR-E polarization ratio variations related to the surface soil moisture leaded to suppress a large amount of the wrong rainfall events.

Domaines

Hydrologie
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Dates et versions

hal-00238559 , version 1 (19-02-2008)

Identifiants

Citer

Thierry Pellarin, Abdou Ali, Franck Chopin, Isabelle Jobard, Jean Claude Bergès. Using spaceborne surface soil moisture to constrain satellite precipitation estimates over West Africa. Geophysical Research Letters, 2008, 35 (2), pp.1-5. ⟨10.1029/2007GL032243⟩. ⟨hal-00238559⟩
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