Estimation of the aerodynamic roughness length in arid and semi-arid regions over the globe with the ERS scatterometer. - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research: Atmospheres Année : 2005

Estimation of the aerodynamic roughness length in arid and semi-arid regions over the globe with the ERS scatterometer.

Résumé

Estimates of the aerodynamic roughness lengths z0 in arid and semi-arid regions are for the first time provided for the whole globe, using satellite ERS scatterometer observations. A statistical relationship is derived between the ERS scatterometer backscattering coefficients and quality in situ and geomorphological z0 estimates. It is a practical solution to provide realistic roughness maps with large-scale spatial patterns that are consistent with independent surface characterization. In addition, it makes it possible to analyze the seasonal and interannual variations of this parameter on a global basis. The satellite-derived surface roughness parameters have been implemented into the dust emission scheme of a global dust cycle model. Dust emission computations are improved when using the ERS derived z0 as input parameter. The spatial correlation between the TOMS observation frequency and the model dust events increases from 0.34 when using fixed z0 to 0.52 when using the satellite-derived estimates.
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Dates et versions

hal-00145818 , version 1 (31-01-2016)

Identifiants

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Catherine Prigent, I. Tegen, Filipe Aires, Beatrice Marticorena, Mehrez Zribi. Estimation of the aerodynamic roughness length in arid and semi-arid regions over the globe with the ERS scatterometer.. Journal of Geophysical Research: Atmospheres, 2005, 110 (D9), pp.D09205. ⟨10.1029/2004JD005370⟩. ⟨hal-00145818⟩
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