2023年潮汕三市春季臭氧污染成因分析

Analysis of Causes of Ozone Pollution in Spring of 2023 in Three Cities of Chaoshan

2023年春季潮汕三市出现历史以来同期最严重的一次臭氧污染,本文主要研究2023年5月潮汕三市的污染过程,系统性的分析了此次臭氧污染的主要原因。结果表明臭氧污染成因与来源:(1)潮汕三市人为源臭氧前体物排放强度较大;(2)部分时段气象条件不利,进一步加重臭氧污染程度。潮汕三市的臭氧主要以本地生成为主,但在部分污染时段,也存在区域臭氧输送现象。基于OBM模式模拟结果可得,潮汕三市人为源VOCs主要来源于间/对二甲苯、顺-2-戊烯、反-2-戊烯、异戊二烯、正丁烯、丙烯、邻二甲苯、乙烯、甲苯、异戊烷等前体物质,人为源主要是来源于油气及烯烃类挥发源,所以应着重管控机动车排放及汽车相关工业。

In spring of 2023,three cities of Chaoshan experienced the most severe ozone pollution in history during the same period.The pollution process in May 2023 was mainly studied and the main reasons was systematically analyzed for this ozone pollution.The results indicated the causes and sources of ozone pollution:firstly,the intensity of anthropogenic ozone precursor emissions in the three cities of Chaoshan was relatively high.Secondly,some weather conditions were unfavorable during certain periods,further exacerbating the level of ozone pollution.The ozone in the three cities of Chaoshan was mainly generated locally,but there were also regional ozone transport phenomena during some pollution periods.Based on the simulation results of the OBM model,it could be concluded that anthropogenic VOCs in the three cities of Chaoshan mainly came from precursor substances,such as m/p-xylene,cis-2-pentene,trans-2-pentene,isoprene,n-butene,propylene,o-xylene,ethylene,toluene,isopentane,etc.Anthropogenic sources mainly came from volatile sources,such as oil,gas and olefins.Therefore,it was necessary to focus on controlling motor vehicle emissions and the automotive related industry.