【摘要】 为探究兰州市近地面臭氧（O₃）浓度的分布特征,对2013～2016年兰州市5个国家空气质量监测点逐时的O₃浓度资料进行了统计分析,结合同期的NO₂和颗粒物(PM₁₀、PM_2.5)浓度资料得到兰州市的O₃污染变化趋势及其分布特征。结果表明:兰州市区O₃与NO₂浓度的日变化呈现相反的变化趋势,二者之间存在明显的负相关关系,相关系数为-0.45;兰州市区颗粒物与O₃之间相互影响,颗粒物浓度春、冬季较高,而O₃夏季较高,O₃与PM_2.5浓度月变化之间的相关系数为-0.78,O₃逐渐成为继颗粒物之后首要污染物天数最多的污染物;兰州市区和榆中县O₃浓度均呈现明显的日变化、月际变化、季节变化;不同站点分布特征显示,兰州市区4个监测站点中兰炼宾馆O₃浓度最高,职工医院与生物制品厂相差不大,铁路设计院最低,表明西固区O₃污染形势最为严峻,七里河区次之,城关区O₃污染较轻,而且榆中县O₃浓度除夏季外其它时段均比市区高。更多还原

【Abstract】 In order to explore the distribution characteristics of near-surface ozone（O₃） concentration in Lanzhou city,the hourly O₃ concentration data of five national air quality monitoring sites in Lanzhou from 2013 to 2016 were statistically analyzed.Combined with the data of NO₂ and particulate matter(PM₁₀ and PM_2.5) concentration in the same period,the variation trend and distribution characteristics of O₃ pollution in Lanzhou were obtained.The results indicated that the daily variation of O₃ and NO₂ concentrations in Lanzhou City showed an opposite trend,and there was a significant negative correlation between them with correlation coefficient of-0.45.Particulate matter and O₃ interacted with each other in Lanzhou city.The concentration of particulate matter were higher in spring and winter,while O₃ was highter in summer.The correlation coefficient between O₃ and PM_2.5 concentration was-0.78.O₃ gradually became the most important pollutant after the particulate matter.The O₃ concentrations in Lanzhou city and Yuzhong county showed obvious diurnal,monthly and seasonal variations.The distribution characteristics of different sites showed that Lanlian Hotel had the highest concentration of O₃ in four monitoring sites in Lanzhou city.There was little difference between the staff hospital and biological products factory,and the railway design institute was the lowest.This result indicated that the O₃ pollution situation in Xigu District was the most serious,followed by the Qilihe District and Chengguan District.The O₃ concentration in Yuzhong county was higher than that in the urban area except for summer.更多还原