摘要
2018年4月在成都市区开展了臭氧(O_(3))以及挥发性有机物(VOCs)等污染物的在线监测,搜集了成都市国控站点数据,对O_(3)污染特征进行分析,利用增量反应活性(RIR)的方法识别了O_(3)生成的关键前体物.结果表明,成都市2016~2018年的4月的O_(3)污染程度逐年加重,O_(3)日变化呈现单峰态;当温度大于20℃,风速处于1~1.5 m·s^(-1),相对湿度小于65%时,O_(3)超标率在4月会高于80%;2018年4月,O_(3)超标天的NOx日均浓度是非超标天的2.3倍,VOCs日均浓度是非超标天的2倍;人为源VOCs、CO、天然源VOCs和NOx这4大类前体物在臭氧超标天对O_(3)的RIR值依次为2.4、0.87、0.06和-2.6,说明O_(3)处于VOCs控制区;从VOCs物种来看,间/对-二甲苯、乙烯、反-2-丁烯、丙烯、邻-二甲苯、甲苯、丙酮、异戊二烯、异戊烷和正丁烷等为O_(3)生成的关键活性VOCs物种.
To study the characteristics of O_(3)pollution and identify the key precursors for O_(3)formation in Chengdu in spring,O_(3)concentrations in April between 2016 and 2018 were analyzed,and on-line measurements of O_(3)and the precursors(VOCs and NOx)were also studied at an urban site.The results showed that the O_(3)pollution level in April increased year by year,and diurnal variations showed a unimodal distribution.When the ambient temperature was more than 20℃,the wind speed was between 1 and 1.5 m·s^(-1),and the relative humidity was less than 65%,the probability of O_(3)pollution occurring in April was more than 80%.In April 2018,the average concentrations of NOx and VOCs during O_(3)pollution days were 2.3-times and 2-times higher than non-pollution days.Furthermore,an OBM method was used to calculate the RIR values of different ozone precursors.This showed that the RIR values of anthropogenic VOCs,CO,biogenic VOCs,and NOx for ozone were 2.4,0.87,0.06,and-2.6,respectively,indicating that O_(3)formation in Chengdu was generally VOC-limited.The RIR values of the VOC species showed that m/p-xylene,ethylene,trans-2-butane,propylene,oxylene,toluene,acetone,isoprene,isopentane,and n-butane were the key active VOC species of ozone formation.
作者
韩丽
陈军辉
姜涛
徐晨曦
李英杰
王成辉
王波
钱骏
刘政
HAN Li;CHEN Jun-hui;JIANG Tao;XU Chen-xi;LI Ying-jie;WANG Cheng-hui;WANG Bo;QIAN Jun;LIU Zheng(Sichuan Academy of Environmental Sciences,Chengdu 610041,China;School of Environment,Tsinghua University,Beijing 100084,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2021年第10期4611-4620,共10页
Environmental Science
基金
国家重点研发计划项目(2018YFC0214001)
四川省生态环境厅重点专项项目(“长江驻点研究”课题三)。
