The microphysical properties of aerosol particles in Shijiazhuang and Handan, Hebei Province, China are analyzed based on aircraft measurements conducted under a typical pollutedweather condition on October 17, 2005. The reasons for the heavy aerosol pollution are discussed. The results show that the particlenumber concentration over both areas are quite high, with the mean concentration in the boundary layer keeping at 103cm-3, and the maximum, which appeared close to the surface, reached 104cm-3. The aerosol particle concentration keeps greater than 103cm-3 above boundary layer. It is found that the relative weak wind and weaker turbulent mixing which lead to less efficient diffusion and dilution of aerosol particles are responsible for the pollutants accumulation. It is further found that the air pathways, which caused the high aerosol pollution, are mainly from northwest and west, with the sources of Mongolia or West China, passing through Gansu, Ningxia, Shanxi, then entering Hebei.
Key words
Aerosol /
Vertical distributio /
Horizontal distribut /
The backward traject
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