Characteristics of Mass Concentration of Dust-aerosols over the Ejin Region

In order to further understand the mineral aerosols in Asian dust source regions, a field measurement of dust-aerosols was carried out in the Ejin region located in the marginal zone of the Badain Juran Desert. By a long-term observation of dust-aerosols in the Ejin region as one of dust source regions, some parameters of the physical and chemical properties of dust-aerosols and of the mass concentrations of dust-aerosols are obtained. The results show that the mass concentration of dust-aerosols in May is the highest but the lowest in September, which is closely related to the meteorological conditions. The observed results during the typical weather processes reveal that there is a diploid relation and a magnitude difference in TSP mass concentration under the different weather conditions, such as the background atmosphere, floating dust, blowing sand and dust storm, and the granular distribution of sand-dust grains is different from the different weather conditions. Generally, the order of magnitude of mass concentration on clear days is 102 μg/m3 and 103 μg/m3 under the weather conditions of floating dust, blowing sand and dust storm. However, it can be up to 104 μg/m3 during severe dust storms. Granular distribution of aerosols is different under the effects of different wind directions, and there are the peculiar characteristics in granular distribution of aerosols compared with that in the Shapotou and Dunhuang regions.