巴彦浩特臭氧污染特征及潜在源分析

Characteristics and potential sources of ozone pollution in Bayanhot

基于2022年6-8月份巴彦浩特环境监测站臭氧浓度及气象数据,结合后向轨迹及潜在源分析对近地面臭氧高值进行分析。结果表明,6月份三个国控站点的臭氧浓度均较高,8月份较低,6月16-18日、6月24-25日是三个国控站点臭氧浓度的高值时段。湿度、温度是影响巴彦浩特臭氧浓度的重要气象因子。白天和夜间,三个国控站点的臭氧浓度均为东南风时达到最高值,且臭氧浓度高值时段的主导风向为东南风。后向轨迹分析显示,6月24日22:00-0:00高值时刻的臭氧污染传输主要受东南气流的影响,6月16日-18日、6月24日-25日浓度权重轨迹分析(WCWT)高值区(>100μg/m^(3))主要出现在宁夏、甘肃东部以及陕西省。

Based on the ozone concentration of Bayanhot Environmental Monitoring Station and meteorological data from June to August 2022,combined with backward trajectory and potential source analysis,the analysis of high values of near surface O_(3)was conducted.The results showed that the ozone concentration of the three national control stations was higher in June,but lower in August.The ozone concentration of the three national control stations was high during June 16-18 and June 24-25.Humidity and temperature are important meteorological factors affecting ozone concentration in Bayanhot.During the day and night,the ozone concentration of the three national control stations reached the highest value when the wind was southeast,and the dominant wind direction during the period of high ozone concentration was southeast wind.The backward trajectory analysis showed that the transmission of ozone pollution at 22:00-0:00 on June 24 was mainly affected by the southeast air flow,and the high value area from the concentration weight trajectory analysis(WCWT)(>100μg/m^(3))mainly distributed in Ningxia,eastern Gansu and Shaanxi Province from June 16 to 18 and from June 24 to 25.