银川市夏季臭氧污染特征及敏感性分析
Characteristics and sensitivity analysis of ozone pollution in summer of Yinchuan
杨丽蓉 1徐学哲 2季群 3潘佳颖 1孙媛1
作者信息
- 1. 银川市生态环境监测站,宁夏 银川 751100
- 2. 中国科学院合肥物质科学研究院,安徽 合肥 230031
- 3. 无锡中科光电技术有限公司,江苏 无锡 214142
- 折叠
摘要
对2022年7月银川市夏季臭氧(O3)污染特征及生成敏感性进行分析,以期为银川市O3污染防控提供科学策略.结果表明:观测期间银川市出现O3超标日共9 d,日最大8 h滑动平均质量浓度平均值较非超标日高32.6％,NO2峰值较非超标日升高近20％;太阳辐射增强、高温低湿等气象特征容易导致O3超标风险增大;银川市挥发性有机物(VOCs)中烷烃、含氧挥发性有机物(O VOCs)、卤代烃占比较高,但对O3生成潜势(OPF)的贡献则呈现出烷烃＞烯烃＞芳香烃＞OVOCs＞炔烃＞卤代烃的趋势,间/对-二甲苯、2-甲基-1,3-丁二烯、乙烯是O3防控的关键VOCs物种;观测期银川市气团以中老化状态(94.3％)为主,其中机动车尾气对VOCs贡献率最大,为33.3％,燃烧源和工业排放贡献率相当,均为21.4％;7月银川市O3生成主要受VOCs控制,现阶段VOCs减排是银川市O3污染防控的有效途径.
Abstract
The characteristics and formation sensitivity of ozone(O3)pollution in summer of Yinchuan in July 2022 were analyzed to provide scientific strategies for local O3 pollution prevention and control.The results showed that there were 9 days of O3 exceeding the standard during observation period.The average value of daily maximum 8 h sliding mean O3 mass concentration increased by 32.6％compared with the non-exceeding day and the peak value of NO2 was nearly 20％higher than that of non-exceeding day.Meteorological characteristics such as enhanced solar radiation,high temperature and low humidity could easily lead to the risk of O3 exceeding the standard.Alkanes,OVOCs and halogenated hydrocarbons accounted for a relatively high proportion in VOCs,while the contribution of O3 formation potential(OFP)showed the tendency of alkanes＞olefins＞aromatic hydrocarbons＞OVOCs＞alkynes＞halogenated hydrocarbons.Among them,m/p-xylene,2-methyl-1,3-butadiene and ethylene were the key VOCs species for O3 prevention and control.During the observation period,the air mass in Yinchuan was mainly in the medium aging state(94.3％),the main source of VOCs was motor vehicle exhaust,which accounted for the largest proportion of 33.3％,and the proportion of combustion sources and industrial emissions was similar,both of which were 21.4％;In July,the generation of O3 in Yinchuan was mainly controlled by VOCs.At present,VOCs emission reduction was the effective way to prevent and control O3 pollution in Yinchuan.
关键词
臭氧生成潜势/敏感性分析/夏季/银川市Key words
ozone formation potential/sensitivity analysis/summer/Yinchuan引用本文复制引用
基金项目
宁夏回族自治区自然科学基金(2022AAC03751)
银川市科技计划(2022ZDSF04)
出版年
2024
NETL
NSTL
维普
万方数据