关中城市群二次PM_(2.5)与O_(3)协同影响特征分析  

Analysis of synergistic effects of secondary PM_(2.5)and O_(3)in Guanzhong urban cluster

作　　者：李琪琪 邓瑾璇 李光华 阿布拉·吐合提 刘家瑶 邓顺熙[1,2] LI Qiqi;DENG Jinxuan;LI Guanghua;Tuheti Abula;LIU Jiayao;DENG Shunxi(School of Water and Environment,Chang’an University,Xi’an 710064;Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of the Ministry of Education,Chang’an University,Xi’an 710064;Shaanxi Provincial Academy of Environmental Science,Xi’an 710061)

机构地区：[1]长安大学水利与环境学院,西安710064 [2]长安大学旱区地下水文与生态效应教育部重点实验室,西安710064 [3]陕西省环境科学研究院,西安710061

出　　处：《环境科学学报》2024年第1期62-73,共12页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划项目(No.2017YFC0212206);陕西省科技统筹创新工程计划项目(No.2016KTZDSF-02-01);陕西省重点研发计划项目(No.2021ZDLSF-05-07)。

摘　　要：PM_(2.5)和O_(3)仍是关中地区主要的环境空气污染物,它们之间存在着复杂的协同影响,有利于颗粒物二次组分的生成.本文基于2021年3月—2022年2月关中地区33个国控监测站点数据,采用CO示踪法,以O_(3)为光化学活性水平评价指标,估算了关中城市群二次PM_(2.5)浓度,并分析了二次PM_(2.5)的分布特征.结果表明,关中城市群PM_(2.5)年均浓度为39.02~50.49μg·m^(-3),PM_(2.5)日均浓度为2.75~229.88μg·m^(-3).PM_(2.5)中二次组分浓度为6.82~11.37μg·m^(-3),二次PM_(2.5)浓度占总PM_(2.5)浓度的比值为21.51%~35.63%.随着O_(3)浓度的提高,大气光化学活性水平增强,促进颗粒物中二次组分形成,表明PM_(2.5)和O_(3)存在协同现象.二次PM_(2.5)浓度占总PM_(2.5)浓度的比值的季节变化次序为:冬季>春季>夏季>秋季.在重度污染情景下二次PM_(2.5)占总细颗粒物浓度的比值超过60%.该成果可为关中城市群协同控制和改善空气质量提供参考.PM_(2.5)and O_(3)are the main ambient air pollutants in the Guanzhong urban cluster.There is a complex synergistic effect between two pollutants,which is conducive to form secondary components of particulate matter.Based on the data from March 2021 to February 2022 measured at 33 national air quality monitoring stations located in the Guanzhong area,this paper estimated the secondary PM_(2.5)concentration by using CO tracer method and an index of evaluating photochemical activity level,and analyzed the distribution characteristics of secondary PM_(2.5).The results showed that the annual PM_(2.5)concentration in the Guanzhong urban cluster ranged from 39.02 to 50.49μg·m^(-3),and the daily average PM_(2.5)concentrations was between 2.75 and 229.88μg·m^(-3).The levels of secondary components in PM_(2.5)were 6.82~11.37μg·m^(-3).The ratio of secondary component to total PM_(2.5)concentration was 21.51%~35.63%.With the increase of O_(3)level and the enhancement of atmospheric photochemical activity,the formation of secondary particles is promoted,indicating that there is a synergistic effect between PM_(2.5)and O_(3).The ratio of secondary particles to PM_(2.5)concentration varied seasonally in the order of winter>spring>summer>autumn.In the heavy haze weather,the percentage of secondary species in the PM_(2.5)exceeded 60%.The results can provide a reference for coordinately mitigating pollution and improving air quality in the Guanzhong city cluster.

关 键 词：二次PM_(2.5) 臭氧 协同影响 关中城市群 

分 类 号：X51[环境科学与工程—环境工程]