Abstract: Inter-regional transport of pollutants is an important and difficult problem in atmospheric environment research. Based on lidar observation data of haze weather processes with high pollution levels in Zhejiang Province, China, from 2012 to 2015, aerosol vertical mass concentration in the region during the period were retrieved and the corresponding inter-regional transport of pollutants in high impact haze weather was studied quantitatively using Mie's theory and Fernald inversion method. The results show that: (1) high impact haze weather in Zhejiang during the period mostly occurs when high-pressure front turns to high-pressure control. High-pressure front is conducive to foreign pollutant input, while high-pressure control is conducive to local pollutant accumulation. (2) The transport height, mass concentration and composition of foreign pollutants vary in different high impact haze processes and even different moments in the same process. The variations of transport height and mass concentration of foreign pollutants are generally from 4.5 to 7.5 km and 450 to 1200 μg·m-3, respectively. Meanwhile, the input pollutants are mainly coarse particles, and the types of pollutants are dominated by sand dust and urban pollutants. (3) Case study shows that only 25 to 35 percent of the input pollutants settles to the near-surface layer. Gravity and temperature decline are the important factors affecting deposition. Comparativley, gravity has a greater effect on the deposition of coarse particles, while air temperature decline has a greater effect on that of fine particles.

Key words: lidar, microwave radiometer, Mie scattering, transport, deposition