Conclusions
The 3-D regional Eulerian long-range transport model coupled with a new deflation module for yellow-sand in East Asia has been applied to simulate the heavy muddy rain recorded in Beijing on April 1998. Nine size bins for yellow-san particles and their micro-physical processes are considered in the model. The comprehensive meteorological conditions are obtained from MM5 (the NCAR/Penn State Fifth-Generation Mesoscale Model)results.
Results show the model, in conjunction with the deflation module, is reliable to predict the yellow-sand concentration and size distribution due to the up-lift, transport, diffusion and removal processes. Generally, there is a good agreement between the observed and predicted results. The vertical distribution of one transport process shows clearly that the small particles are transported as two levels, one is near the ground,the other in the middle troposphere. The long-range transport processes of yellow-sand and the light rain are responsible for the formation of muddy rain. The cloud physics and precipitation process mixed with plenteous of yellow-sand from loess plateau, especially the size less than 2µm, led to the heavy muddy rain in North China.
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Wang, Z., Takahisa, M., Ueda, H. (2004). Modeling of Muddy Rain Due to the Long-Range Transport of Yellow-Sand in East Asia. In: Gryning, SE., Schiermeier, F.A. (eds) Air Pollution Modeling and Its Application XIV. Springer, Boston, MA. https://doi.org/10.1007/0-306-47460-3_28
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DOI: https://doi.org/10.1007/0-306-47460-3_28
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