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W4387185865 abstract "Abstract. Due to a robust emission control policy, significant reductions in major air pollutants, such as PM2.5, SO2, NO2, and CO, were observed in China between 2015 to 2020. On the other hand, during the same period, there was a notable increase in ozone (O3) concentrations, making it a prominent air pollutant in eastern China. The annual mean concentration of maximum daily 8-hour average (MDA8) O3 exhibited alarming linear trends of 2.4, 1.1, and 2.0 ppb yr–1 in three megacity clusters: three-fold increase in the number of O3-exceeding days, defined as MDA8 O3 >75 ppb during the same period. Our analysis indicated that the upward trends in the annual mean concentration of MDA8 were primarily driven by the rise in consecutive O3-exceeding days. Furthermore, from 2015 to 2017, there was a widespread expansion of high O3 concentrations from urban centers to surrounding rural regions, resulting in a more uniform spatial distribution of O3 after 2017. Lastly, we discovered a close association between O3 episodes featuring four or more consecutive O3-exceeding days and the position and strength of Beijing-Tianjin-Hebei (BTH), Yangtze River Delta (YRD) and Pearl River Delta (PRD). Additionally, there was a significant the West Pacific subtropical high (WPSH). The WPSH contributed to meteorological conditions characterized by clear skies, subsiding air motion, high vertical stability in the lower troposphere, increased solar radiation, and positive temperature anomaly at the surface. These favorable meteorological conditions greatly facilitated the formation of O3. Thus, we propose that the worsening O3 trends observed in BTH, YRD and PRD from 2015 to 2020 can be attributed to enhanced photochemical O3 production resulting from an increased occurrence of meteorological conditions with high solar radiation and positive temperature anomalies under the influence of WPSH and tropical cyclones." @default.
W4387185865 created "2023-09-30" @default.
W4387185865 creator A5034091107 @default.
W4387185865 date "2023-09-29" @default.
W4387185865 modified "2023-10-14" @default.
W4387185865 title "Reply on RC1" @default.
W4387185865 doi "https://doi.org/10.5194/egusphere-2023-1088-ac1" @default.
W4387185865 hasPublicationYear "2023" @default.
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