Abstract:This study uses lidar data to investigate a severe haze event in the Guangzhou area. We analyze the impact of the boundary layer structure evolution on the distribution of aerosol extinction coefficient profile, based on the aerosol extinction coefficient and depolarization ratio retrievals. Results show that aerosol particles mainly concentrate below 1.5km in this event. The haze layer mostly extends to 1km and up to 1.5km in the afternoon under moderate haze condition, but only up to 500m under severe haze condition. During clean days, the aerosol extinction coefficient decreases linearly with height, and the scale height at the altitude of 1490m. In contrast, it decreases exponentially and the scale height maximizes at the altitude of 789.5m during haze days. The evolution of boundary layer is well represented by the change of aerosol extinction coefficient profile. The aerosol extinction coefficient peaks at the top of the residual layer. The aerosol depolarization ratio exhibits strong diurnal variation with higher value during daytime than at night and maximum value in the afternoon. In this event, the aerosol depolarization ratio is mostly less than 0.2. Only the clean days display local aerosol profile that is close to the Elterman profile.
邓涛, 吴兑, 邓雪娇, 谭浩波, 李菲, 陈欢欢. 一次严重灰霾过程的气溶胶光学特性垂直分布[J]. 中国环境科学, 2013, 33(11): 1921-1928.
DENG Tao, WU Dui, DENG Xue-Jiao, TAN Hao-Bo, LI Fei, CHEN Huan-Huan. The vertical distribution of aerosol optical properties in a severe haze event. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(11): 1921-1928.