Analysis of O3 Pollution Characteristics, Formation Sensitivity, and Transport Impact in Southern Nanjing

被引：1
|
作者：
Zheng X.-M. [1 ]
Hu K. [2 ]
Wang M. [3 ]
Xie F.-J. [1 ]
Wang Y. [1 ]
机构：
[1] Nanjing Municipal Academy of Erologiral and Environment Protection Sriense, Nanjing
[2] State Joint Key Laboratory of Environmental Simulation and Pollution Cojjfrol, College WEnvironmental Sciences and Engineering, Peking University, Beijing
[3] Collaborative Innovation Center of Ambient Environment and Equipment Terhnolog, Jiangsu fev Laboratory' of Ambient Environment Monitoring and Pollution Control, Srhool of Environmental Srienre and Engineering, Nanjing Universitv of Information Srienre & Te
来源：
Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 08期
关键词：
Nanjing; O[!sub]3[!/sub]-VOCs-NO[!sub]x[!/sub] sensitivity; observation-based model (OBM); potential source analysis; transport impact;
D O I：
10.13227/j.hjkx.202207171
中图分类号：
学科分类号：
摘要：
As one of the most important city clusters in China, surface ozone (O3) pollution in the Yangtze River Delta (YRD) Region has become a prominent air quality problem in recent years. Online observations of ambient O3 , nitrogen oxides (NOx), and volatile organic compounds (VOCs) were conducted in southern Nanjing from July- September 2020 and April-May 2021. On this basis, the pollution characteristics of O3 were analyzed. The O3-VOCs-NOx sensitivity and the transport influence of its precursors were further discussed using models. The frequency statistics of the daily maximum 8-hour moving average (DMA-8h O3) and hourly concentration (O3-lh) showed that O3 pollution in southern Nanjing was more serious than that in urban areas. Three typical O3 pollution episodes were selected during the whole observation period, which included August 16th-27th 2020; September 3nd-11th, 2020; and May 17th-25th 2021. The O3-VOCs-NOv sensitivities in these three pollution episodes were analyzed using the observation-based model (OBM). The results of the relative incremental reactivity (RIR) and empirical kinetics modeling approach (EKMA) showed that the sensitivities of O3 formation in the three pollution episodes were in the NO,-limited regime, the transition regime, and the YOCs-limited regime, respectively. This difference in O3-V0Cs-N0x sensitivity reflects that the site may have been influenced by transport. Therefore, the potential source contribution function (PSCF) and the concentration weighted trajectory (CWT) method were further used to analyze the potential source areas of NOx, VOCs, and O3 in these three pollution episodes. The results showed that there were obvious regional transport effects of NOx, VOCs, and O3 in these three pollution episodes. The location of potential sources differed in these three pollution episodes, which were affected by the eastern cities of the Lishui site; the urban area of Nanjing and eastern area of Anhui Province; and the urban area of Nanjing and the middle of the YRD Region, respectively. The impact of transport on O3 and its precursors also indicated the necessity of regional joint prevention and control of O3 pollution in the YRD Region. © 2023 Science Press. All rights reserved.
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页码：4231 / 4240
页数：9
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