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

作　　者：CHENG XueLing ZENG QingCun HU Fei 

机构地区：[1]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China

出　　处：《Chinese Science Bulletin》2012年第27期3595-3602,共8页

基　　金：supported by the National Natural Science Foundation of China (40830103 and 40875008);the National Basic Research Program of China (2010CB951804)

摘　　要：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.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 con- struct 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.

关 键 词：沙尘暴过程 阵风 粉尘 随机建模 夹带 大气边界层 相干结构 气流运动 

分 类 号：P425.55[天文地球—大气科学及气象学]