成都市夏季近地面臭氧污染气象特征

Meteorological Characteristics of O_3 Pollution Near the Ground in Summer of Chengdu

利用2016年7月成都市8个环境监测站点的臭氧、NO_2的监测资料以及成都市国家基准气象站和基本气象站的观测资料,对成都市夏季臭氧、NO_2浓度和气象要素的日变化特征和臭氧污染过程进行了分析。研究结果表明:成都市臭氧污染受综合气象条件和NO_2浓度的影响,高温、低湿、强辐射有利于臭氧大量生成,NO_2浓度高低决定了臭氧浓度的峰值大小;在污染期间,大气边界层高度远高于本地平均水平,数值约为平均水平的2～3倍;成都市臭氧污染的主要影响因子存在地区差异,成都市区的臭氧主要来自于自身的光化学反应,而灵岩寺地区的臭氧来自于VOCs和大气水平输送。

Based on the monitoring data of ozone and NO2 in 8 environmental monitoring sites of Chengdu in July 2016, the observed data of Chengdu National Reference Station and Basic Weather Station, the diurnal variation of ozone and NO2 and meteorological factors in Chengdu and the feature in pollution process were studied. Results indicated that ozone pollution in Chengdu was affected by comprehensive meteorological conditions and NO2 concentration. High temperature, low humidity and strong radiation were favorable for the generation of ozone. The peak value of ozone concentration was determined by NO2 concentration; During the pollution period, the atmospheric boundary layer height was 2-3 times higher than the local average; There were regional differences in ozone pollution in Chengdu, urban ozone mainly came from the local photochemical reactions, and the ozone of Lingyan temple came from the VOCs and the horizontal air transport.