摘要
以2023年中国—中亚峰会(以下简称“峰会”)期间关中平原城市细颗粒物(PM 2.5)中的有机碳(OC)和元素碳(EC)为对象,分析了其碳质气溶胶时空变化特征和影响因素,并解析了污染来源。结果表明,峰会前、峰会期间和峰会后总碳(TC)平均质量浓度分别为5.3、5.2、4.1μg/m^(3)。较峰会前,峰会期间西安的一次碳质气溶胶平均浓度下降了26.7%,二次有机碳质气溶胶平均浓度增长了25.9%。西安NO_(2)减少最明显;除铜川SO_(2)浓度下降外,其余4个城市(西安、宝鸡、渭南和咸阳)均有所上升。西安PM 2.5的主要来源为二次源(贡献率58.7%),咸阳为机动车源和二次源的混合源(贡献率60.9%),宝鸡、渭南和铜川为机动车源(占比分别为71.0%、63.4%和57.2%),说明峰会期间西安的机动车排放得到有效控制,但气溶胶的二次生成现象更明显。
Taking organic carbon(OC)and elemental carbon(EC)in atmospheric fine particulate matter(PM 2.5)in cities of the Guanzhong Plain during the 2023 China-Central Asia Summit(hereinafter referred to as the summit)as the research objects,this study analyzed the spatiotemporal variation characteristics and influencing factors of carbonaceous aerosols,and identified the emission sources of PM 2.5.The results showed that the average mass concentrations of total carbon(TC)before,during,and after the summit were 5.3,5.2 and 4.1μg/m^(3),respectively.Compared with the pre-summit period,the mass concentration of primary carbonaceous aerosols in Xi’an decreased by 26.7%during the summit,while the average mass concentration of secondary carbonaceous aerosols increased by 25.9%.During the summit,the reduction of NO_(2)in Xi’an was the most significant.With the exception of Tongchuan,where SO_(2)concentration decreased,SO_(2)levels increased in the other four cities(Xi’an,Baoji,Weinan,and Xianyang).The primary source of PM 2.5 in Xi’an was secondary formation(contributing 58.7%),whereas in Xianyang,it was a mixed source of vehicle emissions and secondary formation(contributing 60.9%).In Baoji,Weinan,and Tongchuan,vehicle emissions were the dominant source(accounting for 71.0%,63.4% and 57.2%,respectively).These results indicated that vehicle emissions in Xi’an were effectively controlled during the summit,but secondary aerosol formation became more pronounced.
作者
高飞
曹磊
池兆洋
张淳
李毅辉
杏艳
王雨薇
葛毅
GAO Fei;CAO Lei;CHI Zhaoyang;ZHANG Chun;LI Yihui;XING Yan;WANG Yuwei;GE Yi(Shaanxi Key Laboratory for Environmental Monitoring and Forewarning of Trace Pollutants,Shaanxi Provincial Environmental Monitoring Center Station,Xi’an Shaanxi 710054)
出处
《环境污染与防治》
北大核心
2025年第12期90-97,I0005,共9页
Environmental Pollution & Control
基金
陕西省雷达组网立体监测网络建设项目(No.ZX2022-04-058)
西北区域空气质量预报业务系统应用升级项目(No.BYZB-2022-007)。
