Stochastic modeling the effect of wind gust on dust entrainment during sand storm

After the passage of a cold front, spring in northern China the outbreak of strong wind is often accompanied by dust emissions. Owing to the coherent structure of wind gust, dust particles can effectively overcome the systematic descending air motion and penetrate into the middle and upper levels of the atmospheric boundary layer, and then propagate further and diffuse into the troposphere where ascending air motion prevails. Here, we consider the coherent structure of wind gust in LS models, and construct a model suitable for the dust entrainment under the dust-storm canopy. With the parameter of gust, we simulate the dust entrainment during dust storms, and test that the coherent structures of wind gust make the sand particles to reach the upper of the boundary layer.