The vertical gradient of dust extinction coefficient is crucial to access the environmental impact of Asian dust to human health at the surface, and to validate the accuracy of chemical transport models. Asian dust and aerosol lidar observation network (AD-Net) was utilized to detect Asian dust cases in Japan and meteorological parameters were employed to analyze the floating dust layer which is separated from the earth surface. Diurnal variation of boundary later structure is one of mechanisms to convey dust particles in upper layer to the surface.
Shimizu et al. (Thu,) studied this question.