2021年唐山市一次臭氧重污染过程研究

A Case Study of Ozone Heavy Pollution in Tangshan

利用唐山市6个环境监测站臭氧小时浓度数据及唐山观测站小时气象数据对2021年6月11-13日臭氧重污染过程进行分析,结果表明,O_(3)浓度极值出现在16~18时,11日、12日中午出现双峰结构,12日2时出现一个小峰值。气象条件上O_(3)浓度与5CM地温正相关最好,其次是最高气温、地面最高温度,2分钟平均风速、总辐射辐照度,与相对湿度明显负相关,气象要素对每日的臭氧形成影响程度不同。总辐射辐照度的双峰结构与O_(3)浓度的双峰结构比较吻合。东南风、南风容易导致臭氧超标。O_(3)生成主要为TVOC控制区。外来输送是导致12日2时臭氧浓度小峰值的主要原因。

This paper analyzes the ozone heavy pollution process from June 11-13 by using the hourly ozone concentration observation data of six environmental monitoring stations in Tangshan and the hourly meteorological data of Tangshan observation station during June 11-13,2021.The results showed that the extreme value of O_(3) concentration appeared between 16:00 and 18:00.A double-peak structure appeared at noon on 11th and 12th,and a small peak appeared at 2pm on 12th.In terms of meteorological conditions,O_(3) concentration has the best positive correlation with ground temperature of 5CM,followed by maximum air temperature,maximum ground temperature,2-minute average wind speed and total radiation irradiance,which are significantly negatively correlated with relative humidity.Meteorological elements have different effects on daily ozone formation.The bimodal structure of total radiation irradiance is consistent with that of O_(3) concentration.The southeastly or southly wind was easy to cause O_(3)pollution.The generation of O_(3) is mainly VOCs control region.External transport was the main reason for the small peak ozone concentration at 2 o'clock on 12th.