2022年8月成渝两地臭氧污染差异影响因素分析  

Analysis of Influencing Factors of Ozone Pollution Difference Between Chengdu and Chongqing in August 2022

作　　者：陈木兰 李振亮 彭超 邓也 宋丹林 谭钦文 CHEN Mu-lan;LI Zhen-liang;PENG Chao;DENG Ye;SONG Dan-lin;TAN Qin-wen(Key Laboratory for Urban Atmospheric Environment Integrated Observation&Pollution Prevention and Control of Chongqing,Chongqing Research Academy of Eco-Environmental Sciences,Chongqing 401147,China;Chengdu Key Laboratory of Atmospheric Research,Chengdu Academy of Environmental Sciences,Chengdu 610072,China)

机构地区：[1]重庆市生态环境科学研究院,城市大气环境综合观测与污染防控重庆市重点实验室,重庆401147 [2]成都市环境保护科学研究院,成都市大气科研重点实验室,成都610072

出　　处：《环境科学》2024年第1期61-70,共10页Environmental Science

基　　金：国家重点研发计划项目(2018YFC0214005);重庆市自然科学基金项目(CSTB2022NSCQ-MSX0504);重庆市基本科研业务费计划项目(Cqhky2021jxjl00004)。

摘　　要：2022年8月成都和重庆呈现显著的臭氧(O_(3))污染差异,成都O_(3)污染天高达20 d,重庆无O_(3)污染天,本文从前体物排放水平和气象条件分析此差异的影响因素.结果表明:(1)成都52种挥发性有机物(VOCs)(包含26种烷烃、16种芳香烃和10种烯烃)的总体积分数(18.8×10^(-9))是重庆(6.6×10^(-9))的2.8倍,总O_(3)生成潜势(OFP=51.2×10^(-9))是重庆(25.0×10^(-9))的2.0倍,总·OH损耗速率(L·OH=3.9 s^(-1))是重庆(2.3 s^(-1))的1.7倍.成都OFP前3是乙烯、间/对-二甲苯和异戊二烯;重庆OFP前3是异戊二烯、乙烯和丙烯.重庆仅烯烃对O_(3)的贡献率是60.7%,而成都烯烃和芳香烃的OFP分别是重庆的1.6倍和2.9倍.综上,成都VOCs总体积分数、大气光化学活性和O_(3)生成潜势均较重庆高.(2)成渝两地L·OH排名第1均为异戊二烯,表明8月O_(3)污染生物源贡献显著,但生物源排放活性与温度存在响应关系,8月14~24日重庆高温(38.3℃)使得生物源排放活性下降,而成都温度(34.9℃)加剧了生物源排放活性.(3)重庆水平、垂直大气扩散条件整体优于成都,且成都受到了区域性污染传输的影响.In August 2022,Chengdu and Chongqing showed significant differences in ozone(O_(3))pollution.Chengdu had O_(3) pollution days for 20 days,whereas Chongqing had no O_(3) pollution days.In this study,we analyzed the influencing factors of this difference from the emission level of precursors and meteorological conditions.The results showed that:①the total mixing ratio of 52 VOCs(volatile organic compounds)(including 26 alkanes,16 aromatics,and 10 alkenes)in Chengdu(18.8×10^(-9))was 2.8 times that of Chongqing(6.6×10^(-9)),and the total O_(3) formation potential(OFP)(51.2×10^(-9))was 2.0 times that of Chongqing(25.0×10^(-9)).The·OH radical loss rate(L·OH)(3.9 s^(-1))was 1.7 times that of Chongqing(2.3 s^(-1)).The top three OFP in Chengdu were ethylene,m/p-xylene,and isoprene,and those in Chongqing were isoprene,ethylene,and propylene.The contribution rate of alkenes to O_(3) in Chongqing was 60.7%,whereas the OFP of alkenes and aromatics in Chengdu were 1.6 times and 2.9 times that in Chongqing.In conclusion,the total mixing ratio of VOCs,atmospheric photochemical activity,and O_(3) formation potential of Chengdu were higher than those of Chongqing.②Isoprene was ranked first place in L·OH in both Chengdu and Chongqing,indicating that the contribution of biogenic sources to O_(3) pollution in August was significant.However,the biogenic source emission activity was in response to temperature.From August 14 to 24,the high temperature in Chongqing(38.3℃)decreased biogenic source emission activity,whereas the temperature in Chengdu(34.9℃)increased the biogenic sources emission activity.③The horizontal and vertical atmospheric diffusion conditions of Chongqing were better than those of Chengdu,and Chengdu was affected by regional pollution transmission.

关 键 词：O_(3)污染 影响因素 传输轨迹 前体物排放水平 O_(3)生成潜势 

分 类 号：X515[环境科学与工程—环境工程]