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2022年春季南京臭氧污染特征及成因分析
Analysis on the Characteristics and Causes of Ozone Pollution in Nanjing in the Spring of 2022
投稿时间:2022-09-20  修订日期:2023-11-16
DOI:10.19316/j.issn.1002-6002.2024.02.07
中文关键词:  臭氧  挥发性有机物  臭氧生成敏感性  来源解析
英文关键词:O3  VOCs  O3 formation sensitivity  source apportionment
基金项目:国家自然科学基金资助项目(41505113);江苏省环境监测科研基金项目(2112);南京环保科技项目(202016)
作者单位
张良瑜 江苏省南京环境监测中心, 江苏 南京 210013 
丁峰 江苏省南京环境监测中心, 江苏 南京 210013 
王鸣* 南京信息工程大学环境科学与工程学院, 江苏省大气环境监测与污染控制高技术研究重点实验室, 江苏省大气环境与装备技术协同创新中心, 江苏 南京 210044 
张丽娟 生态环境部卫星环境应用中心, 北京 100094 
陈新星 江苏省南京环境监测中心, 江苏 南京 210013 
胡崑 南京信息工程大学环境科学与工程学院, 江苏省大气环境监测与污染控制高技术研究重点实验室, 江苏省大气环境与装备技术协同创新中心, 江苏 南京 210044 
蔡沅辰 江苏省南京环境监测中心, 江苏 南京 210013 
通讯作者:王鸣*  南京信息工程大学环境科学与工程学院, 江苏省大气环境监测与污染控制高技术研究重点实验室, 江苏省大气环境与装备技术协同创新中心, 江苏 南京 210044  
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中文摘要:
      2022年春季,受新一轮新冠疫情影响,长三角各城市采取了一系列管控措施,使得大气污染物排放水平降低。对2022年春季(3—5月)南京及长三角地区的六项污染物尤其是臭氧(O3)的变化特征进行了分析,从气象因素和O3前体物方面,同时利用基于观测的模型(OBM)对南京O3污染变化原因进行了研究,并分析了南京挥发性有机物(VOCs)的关键活性组分和来源。结果表明:2022年春季,南京PM2.5、PM10、NO2和CO均值浓度均同比下降,但O3日最大8 h滑动平均质量浓度(O3-8 h)同比上升19.8%,O3-8 h超标时间同比增加9 d;长三角区域O3-8 h同比上升17.9%,O3-8 h超标天数为2021年同期的2.5倍。南京O3浓度上升的原因:一方面是由于不利的气象条件,另一方面是由于南京O3生成处于VOCs控制区,但氮氧化物(NOx)降幅大于VOCs降幅,同时结合O3前体物削减方案的分析结果发现,VOCs和NOx不当的削减比例会导致O3浓度不降反升。南京O3生成的关键VOC活性物种依次为乙醛、丙烯、间/对二甲苯、丙烯醛和乙烯;正定矩阵因子分解(PMF)解析结果显示,机动车尾气是南京城区VOCs的主要来源,其次为液化石油气/天然气使用和石油化工。
英文摘要:
      Affected by the new round of COVID-19 in the spring of 2022,cities in the Yangtze River Delta adopted a series of control measures,resulting in a reduction in the emission level of air pollutants. The variation characteristics of six pollutants, especially ozone (O3),in Nanjing and Yangtze River Delta in the spring (from March to May) of 2022 were analyzed. From the aspects of meteorological factors and O3 precursors, and using observation-based models (OBM), the cause of variation of O3 pollution in Nanjing were studied. Key active components and sources of volatile organic compounds (VOCs) of Nanjing were analyzed. The results showed that:compared with that in 2021, the average concentrations of PM2.5, PM10, NO2 and CO all decreased,but O3-8 h concentration increased by 19. 8% and days of O3 -8 h exceeding standard increased by 9 days in Nanjing, and O 3-8 h concentration increased by 17. 9%,and the number of days of O3 -8 h exceeding standard increased by 1. 5 times in the Yangtze River Delta in the spring of 2022. On the one hand,the rise of O3 concentration in Nanjing was due to unfavorable meteorological conditions,on the other hand,O3 generation in Nanjing was more sensitive to VOCs,but reduction percentage of nitrogen oxides (NOx) concentration was more than that of VOCs,and combined with the analysis results of O3 precursor emission reduction scheme,it was found that the improper emission reduction ratio of VOCs and NOx could lead to O3 concentration rising instead of falling. The key active species of VOC for ozone generation of Nanjing were acetaldehyde, propylene, m/p-xylene, acrolein and ethylene. The results of positive matrix factorization (PMF) showed that vehicle exhaust was the main source of VOCs in Nanjing urban area,followed by LPG/NG use and petrochemistry.
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