深圳典型灰霾过程的大气成分日变化分析

利用深圳国家基本气象站观测数据和竹子林大气成分站颗粒物、污染气体的浓度资料,对典型灰霾过程粒子浓度的日变化的特征进行了对比分析,结果表明:在变性高压脊控制下,污染物浓度在晚上交通高峰期达到最大值,人为排放和稳定的层结提供了有利的条件;在热带气旋外围下沉气流控制时,污染物浓度日变化有3个峰值,并且中午的峰值高于早、晚交通高峰期的峰值,光化学污染明显;在低槽或切变线影响下,早、晚交通高峰期的峰值高于中午的峰值,人为源排放成为主要的污染物来源。

Analysis of the Diurnal Variation of Atmospheric Compositions During Typical Hazy Weather in Shenzhen

Using the data of concentration of particulates and polluting gases from a station for atmospheric compositions as well as observations from a basic national weather station in Shenzhen, the charaeteristics of diurnal variations of particulate concentration during typical processes of haze are compared and analyzed. The result is presented as follows. Under the dominance of a transforming high ridge, the concentra- tion of pollutants can reach the maximum during the evening rush hour, due to faw）rable conditions of anthropogenic emission and stable stratification. With descending air currents at the periphery of tropical cyclones, the diurnal variation of pollutants concentration is featured by three peaks, with the midday peak larger than the other two during the rush hour in the morning and evening. Photochemical pollution is significant. Affected by low-pressure troughs or shear, the concentration peaks in the morning and evening rush hour are higher than that of midday and anthropogenic emission is the main source of pollutants.