东北沿海城市大气中臭氧浓度时间分布特征分析

Analysis on Temporal Distribution Characteristics of Ozone Concentration in Atmosphere at Northeast Coastal Cities in China

以东北6个沿海城市大气中臭氧浓度变化为研究对象,选取2018~2020年6个城市共计77个国控环境空气质量自动监测站24 h连续监测数据,在不同时间尺度上分析了臭氧年均浓度的变化特征。结果表明:2018~2020年东北沿海城市臭氧浓度和臭氧污染日逐年下降,春夏季节臭氧浓度较高,超出二级标准,秋冬季臭氧浓度较低,符合二级标准。臭氧污染日基本集中在4~9月,其中,5~6月的臭氧污染日最多,臭氧日浓度最高;1~2月和11~12月臭氧日浓度最低,臭氧污染日为0;臭氧小时浓度6~7时为最低值,15~16时为最高值。

To make a study on the changes in ozone concentration in atmosphere at northeast coastal cities in China,round-the-clock monitoring data acquired at seventy-seven state-controlled ambient air auto-monitoring substations in six cities in the period of 2018~2020 were chosen for analyzing the variation features of annual average ozone concentration on different time scales.The results show that from 2018 to 2020,the ozone concentration and ozone pollution in the northeast coastal cities in China are decreasing year by year.The ozone concentration is higher in spring and summer,exceeding the second-level standard,and the ozone concentration is lower in autumn and winter,meeting the second-level standard.The ozone pollution suffering days were mainly concentrated from April to September.Among them,the ozone pollution days are the most from May to June,and the daily concentration of ozone is the highest.The lowest ozone concentration occurred in January,February,November and December without emerging of any ozone pollution suffering days.As regards the hourly mean ozone concentration,the lowest one appeared within 6 to 7 o’clock and the highest one at 15 to 16 o’clock.