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Article Dans Une Revue Contributions to Atmospheric Physics Année : 1999

Comparison of Emission Models Used for Large Scale Simulation of the Mineral Dust Cycle

Résumé

Three different emission models of minerai dust of increasing complexity have been compared to satel· lite observations of minerai dust Qvec the Western Sahara. in arder to evaJuate their capability to simulate the frequency of the dust events. The first model is a !inear function of the wind velocity. ft provides a very pocr agreement with the observations (8%). The second one is a function of the wind velocity raised to the third power with a unique threshold for the dust emission, weighted by a soil texture parameter. With regards to the limited number of input parameters required by such a model, the agreement with the observations is quite good (61 %) but the location and intensity of the dust sources are not accurately simulated. The third model is based on a physical description of the main processes of dust emission. Il alsa utilizes mapped inputs of parameters characterizing the surface features in the tested area. The agreement with the observations is very good (79%) and the model provides a fine description of the dust sources location and intensity. From camparison with observations, it is stated that a simple wind power model is not appropriate to simulate the minerai dust emissions. A single threshold source model provides simulation of the present dust emissions with a reasonable confidence level. Mareover, the input parameters required by such a model are available ta perfonn global simulations of the minerai dust cycle, even if its application may be limited to climatolagical studies for the present time. The best agreement with the satellite observations is obtained by using a physically based dust emission model. However th~ application of such models on large scale is limited by the availability of the input data characterizing the surface features of the desert aceas.
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hal-02328131 , version 1 (24-10-2019)

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  • HAL Id : hal-02328131 , version 1

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Beatrice Marticorena, Gilles Bergametti, Michel Legrand. Comparison of Emission Models Used for Large Scale Simulation of the Mineral Dust Cycle. Contributions to Atmospheric Physics, 1999, 72, pp.151-160. ⟨hal-02328131⟩
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