Abstract：Based on the aerosol observations of the micropulse lidar in Shijiazhuang City in winter 2016, the normalized gradient method and the gradient method were used to invert the atmospheric pollution boundary layer height, and the results were compared with the boundary layer height determined by sounding data in the same period. Typical cases were selected to analyze the process evolution characteristics of the height of the polluted boundary layer, and investigate the structure of the polluted boundary layer at different air quality levels. The results indicate that, the retrievals of these two approaches were consistent with the boundary layer height determined by sounding data and the correlation coefficients were 0.62 and 0.55, which passed the significance test of 0.05. However, the relative error were 19% and 34% indicating that the normalized gradient method was better than the gradient method. When the air quality were Moderate and Good, the accuracy of results was reduced with a maximum deviation of nearly 1000m. As the degree of pollution increases, the difference decreases. During the period of pollution, the height of the pollution boundary layer was generally less than 1000m, and the lowest height was about 400m at the heaviest pollution. The aerosol extinction coefficients of different air quality levels and heights had different vertical decline rates. Maximum vertical decline rate was at 400m height in polluted weather. It indicated that the heavy pollution accumulation layer was below 400m, and then the extinction coefficient decreased significantly with height increased. It was clean air above 700m.
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