No abstract

The vertical distribution of aerosol extinction coefficients within winter planetary boundary layer (WPBL) over the observation site are shown in this paper, and the heights of PBL are discussed. The data indicates that the aerosol over the measurement site is almost trapped within PBL and troposphere layer and is rather stable, and the multi-layer structure of the aerosol distribution is obvious.

We investigate the extinction coefficients of atmospheric aerosol over the Large High Air Shower Observatory (LHAASO), located at the Haizi Mountain, Daocheng County, China. The Aerosol Optical Depth(AOD), the column-integrated extinction coefficient(EC), is obtained by MODerate-resolution Imaging Spectroradiometer(MODIS) from 2011−2018. The data of extinction coefficients over LHAASO have been analyzed by Infrared Pathfinder Satellite Observations (CALIPSO) satellite during 2011-2017. Our results show that the AOD and EC have a yearly variation with the peak values in July, August and September, and less in the other months, which suggests that the atmospheric aerosols over LHAASO has its special characteristics. Over LHAASO the EC of the atmospheric aerosols are very small, which is consistent with other studies. The maximum values of EC occurred around 6∼7km altitude. Due to the bigger error of EC, more CALIPSO data to be utilized for the variability of EC over LHAASO.