Observation and Study on Aerosol Properties in Hazy Days
灰霾过程中的气溶胶特性观测研究

Combined observations of sun-photometer and lidar on aerosol properties have been conducted in the intense hazy days at the beginning of April 2007 at Xianghe in Hebei Province.It exhibits that the atmospheric visibility reduced from 20 km to approximate 3 km.There is a pronounced increase of aerosol optical depth(AOD)at 3 wavelengths,particularly the AOD increases form 0.31 on April 6 to 1.40 on April 10 at 380 nm,and an outstanding reduction of Angstrom exponent(ALPHA),such as ALPHA reduces from 1.45 on A...