关键词: 沙尘暴, 摩擦速度, 干沉降

Abstract: A model has been developed on the basis of the mesoscale dynamic model(MM4) coupling with a set of massconservation equations of the particles to simulate the dust events of the East Asia. In the model, the airborne particles are categorized into several bins in size. The source and sink of dust are considered. Dealing with the source, four factors are include: origin mechanism, scope of source, estimation of concentration and size distribution of concentration. Dry deposition and gravity precipitation of the particles are considered in the sink term. We examine the function of the model with the historical data, and the simulation results prove the capability of this model to simulate dust storm.

Key words: duststorm, friction velocity, dry deposition