27 December 1995 Soil-derived dust emission from arid areas: compared results from IR-channel satellite observation and by means of simulations
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Abstract
This article deals with a comparison between dust fluxes simulated with a physical emission scheme and satellite observations of desert dust emissions. This physical scheme allows to quantify the dust emissions as a function of the parameters describing the surface characteristics in the source-region: soil nature (size-distribution and mineralogy) and surface roughness. The surface properties of the western Sahara have been mapped on a grid (1°xl°), using a geomorphologic approach, in order to determine the soil parameters required to perform large-scale simulations of dust emissions. The surface wind velocities are supplied by the analyses of the European Centre for Medium Range Weather Forecast (ECMWF). The western Sahara proves to be strongly non-uniform as to the threshold velocities and the related dust emissions. The spatio-temporal distributions of the emitted dust simulated by the model and the Infrared Difference Dust Index (IDDI) derived from Meteosat observations reveal a close agreement, far from being reached when using the currently used single threshold source-functions. A quantitative relation is observed for the emission strength, in the form of a linear fit between the IDDI and the logarithm of the mass flux simulated by the dust production scheme.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michel Legrand, Claude N'doume, Beatrice Marticorena, Gilles Bergametti, and Yann Callot "Soil-derived dust emission from arid areas: compared results from IR-channel satellite observation and by means of simulations", Proc. SPIE 2578, Passive Infrared Remote Sensing of Clouds and the Atmosphere III, (27 December 1995); doi: 10.1117/12.228927; https://doi.org/10.1117/12.228927
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