摘要
为评估太原青运会期间大气污染控制措施对空气质量的改善效果,对青运会会前、会期和会后三个阶段太原市6种污染物浓度的演变及气溶胶在垂直方向上的变化进行了分析。结果表明:青运会期间太原市PM_(10)、PM_(2.5)、CO、NO_(2)、O_(3)较青运会前分别下降30.5%、37.3%、20.2%、18.0%和18.6%,SO_(2)削减程度不明显。垂直方向上,青运会期间气溶胶消光系数峰值降低24.6%,其中低湿天气下气溶胶消光系数峰值下降46%,高湿天气下峰值下降21.6%,青运会期间大气中PM_(2.5)在PM_(10)中的占比降低,垂直大气中气溶胶的吸湿增长能力增强。与2017和2018年同期相比,青运会期间PM_(10)、PM_(2.5)、CO、NO_(2)浓度均有大幅下降,O_(3)浓度较近两年同期无显著变化。因此,青运会期间的各项控制措施有效降低了本地颗粒物浓度。
To evaluate the impact of air pollution control measures on air quality improvement during the Second National Youth Games held in Taiyuan,we analyzed the evolution of concentrations of six pollutants and the vertical variation of aerosols in three periods(before the games,during the games,and after the games).The results show that compared with the period before the games,the concentrations of PM_(10),PM_(2.5),CO,NO_(2),and O_(3)during the games decrease by 30.5%,37.3%,20.2%,18.0%,and 18.6%,respectively in Taiyuan,while the reduction of SO_(2)is not obvious.In terms of the vertical variation,the peak value of aerosol extinction coefficient decreases by 24.6%during the games on average,decreasing by 46%under low relative humidity(RH<60%)conditions and 21.6%under high RH(>60%)conditions,respectively.The ratio of PM_(2.5)to PM_(10)decreases during the game and the hygroscopic growth effect of aerosols in the vertical atmosphere is enhanced.Compared with the same period in 2017 and 2018,all the concentrations of PM_(10),PM_(2.5),CO,and NO_(2)decrease significantly,while the O_(3)concentration exhibits small variation.In conclusion,control measures during the Youth Games can effectively reduce the local particulate matter concentrations.
作者
郭伟
朱凌云
汪文雅
高兴艾
成鹏伟
张岳军
GUO Wei;ZHU Ling-yun;WANG Wen-ya;GAO Xing-ai;CHENG Peng-wei;ZHANG Yue-jun(Shanxi Institute of Meteorological Sciences,Taiyuan 030002,China)
出处
《气象与环境学报》
2021年第6期36-43,共8页
Journal of Meteorology and Environment
基金
山西省重点研发计划项目(201803D31220)
山西省面上青年基金项目(201801D221333、201801D22134)
山西省气象局重点项目(SXKZDDQ20185105)共同资助。
关键词
空气质量
气溶胶垂直分布
颗粒物
Air quality
Vertical distribution of aerosol
Particulate matter