Observation of atmospheric boundary layer height by ground-based LiDAR during haze days

In order to investigate characteristics of atmospheric boundary layer height ( ABLH) during haze pollution,we used ground-based CE370-C micro pulse LiDAR to derive the ABLH during January 2013 over Beijing,based on the gradient method. We find that the ABLH in severe haze days is lower than that in weak haze days and beneath about 500 m,with daily averaged value of about 424m. The ABLH has negative correlation with the concentration of surface PM2. 5 . The comparison of LiDAR observation with radiosonde detection is also presented in the paper and results show that two approaches have good consistency with difference less than about 86 meters.