2018年-2021年琼海市城区臭氧污染特征研究

Study on Ozone Pollution Characteristics in Qionghai City from 2018 to 2021

利用2018年-2021年琼海市3个空气质量自动监测站点小时监测资料和同期气象数据,分析了琼海市臭氧(O_(3))的污染特征。结果表明:2018年-2021年琼海市O_(3)第90百分位数年均浓度分别为82、116、96和108μg/m^(3),呈震荡上升的趋势。O_(3)日最大8 h平均浓度变化范围为3~196μg/m^(3),日变化呈典型单峰型特征,月变化呈V字型分布,7月O_(3)浓度最低,11月浓度最高。O_(3)浓度呈现出一定的季节变化规律,秋冬季比较高,夏季最低。O_(3)污染气象条件是低湿、高温,O_(3)浓度与降雨量无显著相关性。基于后向轨迹HYSPLIT模型,结果表明:O_(3)超标天主要由外来传输影响造成。

Based on the hourly monitoring data of three air quality automatic monitoring stations and meteorological data in Qionghai from 2018 to 2021,the pollution characteristics of ozon(O_(3))in Qionghai city were analyzed.The results show that the annual concentration of ozone in the 90th percentile of ozone in Qionghai city were 82,116,96 and 108μg/m^(3),and the ozone concentration had a trend of fluctuating rise.The maximum 8-hour average ozone concentration ranges from^(3) to 196μg/m^(3).Daily ozone concentration variation showed a single-peak distribution.Monthly ozone concentration variation showed a V-shaped distribution.The ozone concentration also exhibited a certain seasonal variation rule,higher in autumn and winter,the lowest in summer.The meteorological conditions for O_(3) pollution are low humidity and high temperature,and there is no significant correlation between O_(3) concentration and rainfall.Based on the backward trajectory HYSPLIT model,the results show that the O_(3) excess is mainly caused by extrinsic transmission influence.