摘要
文章采用臭氧差分吸收激光雷达对2020年7-8月期间无锡市大气臭氧进行在线连续监测,同时利用NECP气象再分析数据,获取无锡市对流层夏季臭氧浓度时空分布特征,统计并分析有无复合作用时,对近地面臭氧浓度变化及对前体物光化学反应的影响。结果表明无锡市臭氧污染日中高空臭氧向地面扩散发生复合作用较为普遍,复合作用下日超标时段延长,臭氧峰值高,臭氧增幅区域依次为沿太湖带、城郊和城区;天然源VOCs及城区向外扩散的VOCs在复合作用下更易导致臭氧生成贡献率高;9-16时复合污染日VOCs下降速率较无复合污染日快;臭氧生成潜势分析复合污染日中OFP贡献最高的依次为甲苯、正丁烯、丙烯,判定主要来自溶剂涂料、石化等行业。
In this paper,the on-line continuous monitoring of atmospheric ozone in Wuxi from July to August 2020 was carried out by using ozone differential absorption LiDAR.At the same time,the temporal and spatial distribution characteristics of tropospheric ozone concentration in summer in Wuxi were obtained by using NECP meteorological reanalysis data,and the effects on near-surface ozone concentration and photochemical reaction of precursors were counted and analyzed with or without compound effect.The results show that the compound effect of the diffusion of high-altitude ozone to the ground in the day of ozone pollution in Wuxi is common,the daily over-standard period is prolonged,the peak value of ozone is high,and the increasing area of ozone is along the Taihu Lake belt,suburbs and urban areas in turn;the combined action of natural VOCs and urban VOCs diffusion is more likely to lead to a high contribution rate of ozone formation,and the daily VOCs decline rate of 9:00-16:00 combined pollution is faster than that of no combined pollution.Ozone formation potential analysis in the compound pollution day,the highest contribution of OFP is toluene,n-butene,propylene,mainly from solvent coatings,petrochemical and other industries.
出处
《科技创新与应用》
2022年第10期83-86,共4页
Technology Innovation and Application
基金
江苏省PM2.5与臭氧协同控制重大专项项目(2019023)。
