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疫情期间人为源减排对城市大气氧化性的影响
摘要点击 2898  全文点击 394  投稿时间:2023-03-24  修订日期:2023-05-09
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中文关键词  大气氧化性  WRF-CMAQ模型  减排  疫情管控  二次污染物
英文关键词  atmospheric oxidizing capacity  WRF-CMAQ model  emission reduction  COVID-19 lockdown  secondary pollutants
作者单位E-mail
朱剑蓝 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, 南京 210044 jianlan_zhu@nuist.edu.cn 
秦墨梅 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, 南京 210044  
朱嫣红 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, 南京 210044  
胡建林 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, 南京 210044 jianlinhu@nuist.edu.cn 
中文摘要
      近年来,中国经济发达地区以细颗粒物(PM2.5)和臭氧(O3)共同引发的区域性复合型大气污染事件频发,大气氧化性(AOC)在其中发挥着重要作用.基于WRF-CMAQ模型,以2020年疫情管控期为案例探究人为源减排对AOC的影响,选取中国东部3个典型城市(石家庄、南京和广州)进行深入分析,量化排放变化及气象变化对氧化剂和AOC变化的贡献,探讨AOC变化对二次污染物生成的影响.结果表明,与2019年同期相比,2020年石家庄、南京和广州的城市平均AOC分别增加了60%、48.7%和12.6%;氧化剂臭氧、羟基自由基和硝酸根自由基的浓度均有不同程度的增加(1.6%~26.4%、14.8%~73.3%和37.9%~180%).排放变化使3个城市AOC分别增加了0.06×10-4、0.12×10-4和0.33×10-4 min-1,气象变化导致石家庄和南京AOC增加(分别为20%和17.9%),但在广州却相反(-9.3%).增强的AOC导致氮氧化速率和挥发性有机物氧化速率升高,即促进了一次污染物向二次污染物的转化,并抵消了部分一次减排的影响,造成了管控期间二次污染物相对排放的非线性变化.
英文摘要
      In recent years, regional compound air pollution events caused by fine particles (PM2.5) and ozone (O3) have occurred frequently in economically developed areas of China, in which atmospheric oxidizing capacity (AOC) has played an important role. In this study, the WRF-CMAQ model was used to study the impacts of anthropogenic emission reduction on AOC during the COVID-19 lockdown period. Three representative cities in eastern China (Shijiazhuang, Nanjing, and Guangzhou) were selected for an in-depth analysis to quantify the contribution of meteorology and emissions to the changes in AOC and oxidants and to discuss the impact of AOC changes on the formation of secondary pollutants. The results showed that, compared with that in the same period in 2019, the urban average AOC in Shijiazhuang, Nanjing, and Guangzhou in 2020 increased by 60%, 48.7%, and 12.6%, respectively. The concentrations of O3, hydroxyl radical (·OH), and nitrogen trioxide (NO3·) increased by 1.6%-26.4%, 14.8%-73.3%, and 37.9%-180%, respectively. The AOC in the three cities increased by 0.06×10-4, 0.12×10-4, and 0.33×10-4 min-1, respectively, due to emission reduction. The meteorological change increased AOC in Shijiazhuang and Nanjing by 20% and 17.9%, respectively, but decreased AOC in Guangzhou by -9.3%. Enhanced AOC led to an increase in the nitrogen oxidation ratio (NOR) and VOCs oxidation ratio (VOR) and promoted the transformation of primary pollutants to secondary pollutants. This offset the effects of primary emission reduction and resulted in a nonlinear decline in secondary pollutants compared to emissions during the COVID-19 lockdown.

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