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https://doi.org/10.5194/egusphere-2023-479
https://doi.org/10.5194/egusphere-2023-479
03 Jul 2023
 | 03 Jul 2023

Summertime response of ozone and fine particulate matter to mixing layer meteorology over the North China Plain

Jiaqi Wang, Jian Gao, Fei Che, Xin Yang, Yuanqin Yang, Lei Liu, and Yan Xiang

Abstract. Measurements of surface ozone (O3), PM2.5 and its major secondary components (SO42−, NO3, NH4+, and OC), mixing layer height (MLH) and other meteorological parameters were made in the North China Plain (NCP) during warm seasons (June–July) in 2021. The observation results showed that the summertime regional MDA8 O3 initially increased and reached the maximum (158.47 μg m−3) when MLH at around 900–1200 m, then turned to decrease with further evolution of MLH. Interestingly, synchronized increases in PM2.5 concentration along with the development of the mixing layer (MLH < 1200 m) have been witnessed, and the positive response of PM2.5 to MLH was significantly associated with the increase in SO42− and OC. It was found that this increasing trend of PM2.5 with elevated MLH was not only determined by the effect of wet deposition process but also by the enhanced secondary chemical formation, which was related to appropriate meteorological conditions (50 % < RH < 70 %) and increased availability of atmospheric oxidants. Air temperature played a minor role in the change characteristics of PM2.5 concentration, but greatly controlled the competing role of SO42− and NO3. The concentrations of SO42− and OC increased synchronously with elevated MDA8 O3 concentration, and the initial increase of PM2.5 along with the increased MLH corresponded well with that of MDA8 O3. We highlight that the correlation between MLH and secondary air pollutants should be treated with care in hot seasons, and the impact of atmospheric oxidation capacity on surface PM2.5 change profile along with the evolution of mixing layer should be considered when developing PM2.5-O3 coordinated control strategies.

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Journal article(s) based on this preprint

29 Nov 2023
Summertime response of ozone and fine particulate matter to mixing layer meteorology over the North China Plain
Jiaqi Wang, Jian Gao, Fei Che, Xin Yang, Yuanqin Yang, Lei Liu, Yan Xiang, and Haisheng Li
Atmos. Chem. Phys., 23, 14715–14733, https://doi.org/10.5194/acp-23-14715-2023,https://doi.org/10.5194/acp-23-14715-2023, 2023
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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Regional-scale observations of surface O3, PM2.5 and its major chemical species, mixing layer...
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