CALIOP激光探测的运城地区气溶胶垂直分布特征

Characteristics of Aerosol Vertical Distribution in Yuncheng Area Based on CALIOP

利用2017年1月1日至2019年12月31日山西省运城地区9个气象站点的地面逐小时资料、地面日值资料和CALIOP激光雷达资料,分别对运城地区霾日和晴日的气溶胶垂直分布特征进行分析。结果表明:运城地区霾发生时,气溶胶主要聚集在0~2 km高度的大气层中,尤其是517 m左右的大气中,气溶胶的最大消光系数为0.61 km-1;0~1 km高度内,霾日最大消光系数约为晴日最大消光系数的3倍;白天与夜间气溶胶垂直分布有明显差别,在气溶胶消光系数相同的情况下,白天气溶胶所在的高度比夜间高;霾发生时,气溶胶体积退偏比集中在0~0.2;晴日近地面体积退偏比在0~0.2的分布频率低于霾日,小粒径气溶胶数量多于大粒径气溶胶数量。

Ground hourly,daily,and CALIOP data from nine meteorological stations in the Yuncheng area of Shanxi Province from January 1,2017 to December 31,2019 were used to analyze the vertical aerosol distribution characteristics on haze and clear days.The results showed that aerosols were mainly concentrated in the atmosphere layer of 0-2 km on haze days,especially the layer of approximately 0.517 km,and the maximum aerosol extinction coefficient was 0.61 km-1.Within 0-1 km,on haze days,the maximum extinction coefficient was approximately three times greater than that on clear days.There was a significant difference in the vertical distributions of aerosols during the day and night.When the aerosol extinction coefficient was the same,the aerosol height was higher during the day than that at night.When haze events happened,volume depolarization ratios of aerosols concentrated in0-0.2.On clear days,the frequency of near-surface volume depolarization ratios ranged from 0 to 0.2,which was lower than that on haze days,and the number of small-particle aerosols was greater than that of large-particle aerosols.