An Investigation of the Dynamical and Physico-Chemical Features of Desert Aerosol over West Africa and Eastern Atlantic
The possible strong climatic influence of mineral aerosol (almost 1 gigaton of desert dust annually mobilized by wind erosion from the arid or semi-arid areas of Northern Africa is transported towards Mediterranean or Atlantic basins) encourages to develop mesoscale modeling description of all the aspects of the dust life cycle: wind uptake, transport, removal, direct or indirect radiative forcing. This poster deals with a mesoscale description of some of these questions. We have simulated a dust outbreak over Atlantic (at the beginning of May 1997) with the mesoscale model RAMS (Regional Atmospheric Modeling System). The main aspects addressed here are (i) dynamics: checking of dust trajectories using satellite imagery and (ii) an attempt to assess the radiative response using local surface measurements (at Sal Island, Cabo Verde).
KeywordsOptical Depth Wind Erosion Dust Cloud Dust Source Regional Atmospheric Modeling System
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