The vertical dust behaviors over a Chinese desert under clear weather observed by laser Ceilometer

Information on dust emission and its transportation in non-dust storm days is quite scarce. In this study, a laser Ceilometer was used to monitor the dust vertical profile for a whole year and the meteorological observation and sounding data were obtained for mixing layer analysis. The results indicate that the dust are prone to accumulate near ground at night and early morning, while begin to attenuate and weaken after sunrise. The diurnal change for summer half year is rather greater than that for winter half year. It can be concluded that dust transport is still possible through middle troposphere in clear days forced by convection strength, which results in the dust vacancy near ground in the afternoon. As the dusts transported through middle troposphere may have finer particles than dust storm, its environmental and climatic impacts cannot be ignored.