标题：Factors driving changes in surface ozone in 44 coastal cities in China

作者：Xiaoyong Liu, Jun Yan, Zifa Wang, Xiaole Pan, Fangcheng Su, Junhui Yan, Jiqiang Niu

来源出版物：Air Quality, Atmosphere & Health, 2023年

DOI：https://doi.org/10.1007/s11869-023-01446-6

出版年: 2023

文献类型：Article

语种：英文

摘要：Surface ozone (O₃) pollution is an important environmental problem in China. We conducted a comprehensive study to investigate the influence of meteorological factors and emissions on O₃ concentrations in 44 coastal cities in China. A Kolmogorov-Zurbenko (KZ) filter was used to decompose the maximum daily average 8-hour O₃ concentrations (MDA8 O₃) into components on different timescales in the coastal cities. It revealed that O₃ concentrations in 44 coastal cities increased from 2015 to 2019 and decreased by 4.0% in 2020. The short-term (O_3ST), seasonal (O_3SN), and long-term components (O_3LT) of MDA8 O₃ contributed 28.4–71.1% (52.0% on average), 18.4–66.4% (37.9%), and 0.09–14.1% (2.6%) to the total variance, respectively, in the 44 cities during 2015–2020. Overall, the O₃ concentrations were more influenced by O_3ST in the southern coastal cities, and more influenced by O_3SN in the northern coastal cities. Using multiple linear regression, the contributions of meteorology and emissions to O₃ concentrations were separated. We estimated that meteorological conditions supported a decrease of 2.1 and 2.9 μg/m³ in O_3LT concentration in 2015 and 2016, respectively. While meteorological conditions promoted O_3LT concentration increased by 0.3-3.0 μg/m³ during 2017-2020. High nitrogen dioxide (NO₂) concentrations, decreasing fine particulate matter (PM_2.5) concentrations, and increasing temperature caused an increase in O₃ concentrations in several coastal cities. We suggest that controlling NO₂ and volatile organic compounds (VOCs) emissions in the future is an effective means of reducing O₃ concentrations.

关键词：Ozone; KZ filter; Meteorological conditions; Precursor emissions; Coastal cities

影响因子：5.1

论文链接：https://doi.org/10.1007/s11869-023-01446-6