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Weakened aerosol-radiation interaction exacerbating ozone pollution in eastern China since China's clean air actions

Yang, Hao ; Chen, Lei ; Liao, Hong ; Zhu, Jia ; Wang, Wenjie ; Li, Xin

Atmospheric chemistry and physics, 2024-04, Vol.24 (7), p.4001-4015 [Periódico revisado por pares]

Katlenburg-Lindau: Copernicus GmbH

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Título:
Weakened aerosol-radiation interaction exacerbating ozone pollution in eastern China since China's clean air actions
Autor: Yang, Hao ; Chen, Lei ; Liao, Hong ; Zhu, Jia ; Wang, Wenjie ; Li, Xin
Assuntos: Aerosols ; Air cleanliness ; Air pollution ; Air pollution control ; Air quality ; Air quality management ; Anthropogenic factors ; Atmospheric chemistry ; Boundary conditions ; Carbon ; Chemistry ; Emissions ; Emissions control ; Environmental law ; Feedback ; Forecasting models ; General circulation models ; Human influences ; Meteorological conditions ; Meteorological research ; Meteorology ; Ozone ; Particulate emissions ; Particulate matter ; Particulate matter emissions ; Photolysis ; Pollution control ; Radiation ; Summer ; Suspended particulate matter ; Urban areas ; VOCs ; Volatile organic compounds ; Weather ; Weather forecasting ; Winter
É parte de: Atmospheric chemistry and physics, 2024-04, Vol.24 (7), p.4001-4015
Descrição: Since China's clean air action, PM.sub.2.5 (particulate matter with an aerodynamic equivalent diameter of 2.5 Âµm or less) air quality has improved, while ozone (O.sub.3) pollution has become more severe. Here we apply a coupled meteorology-chemistry model (WRF-Chem: Weather Research and Forecasting model coupled to Chemistry v3.7.1) to quantify the responses of aerosol-radiation interaction (ARI) to anthropogenic emission reductions from 2013 to 2017, including aerosol-photolysis interaction (API) related to photolysis rate change and aerosol-radiation feedback (ARF) related to meteorological field change and their contributions to O.sub.3 increases over eastern China in summer and winter. Sensitivity experiments show that the decreased anthropogenic emissions play a more prominent role in the increased daily maximum 8 h average (MDA8) O.sub.3 in both summer (+1.96 ppb vs. +0.07 ppb) and winter (+3.56 ppb vs. -1.08 ppb) than the impacts of changed meteorological conditions in urban areas. The decreased PM.sub.2.5 caused by emission reductions can result in a weaker impact of ARI on O.sub.3 concentrations, which superimposes its effect on the worsened O.sub.3 air quality. The weakened ARI due to decreased anthropogenic emissions aggravates the summer (winter) O.sub.3 pollution by +0.81 ppb (+0.63 ppb), averaged over eastern China, with weakened API contributing 55.6 % (61.9 %) and ARF contributing 44.4 % (38.1 %), respectively. This superimposed effect is more significant for urban areas during summer (+1.77 ppb). Process analysis indicates that the enhanced chemical production is the dominant process for the increased O.sub.3 concentrations caused by weakened ARI in both summer and winter. This study innovatively reveals the adverse effect of weakened aerosol-radiation interaction due to decreased anthropogenic emissions on O.sub.3 air quality, indicating that more stringent coordinated air pollution control strategies should be implemented for significant improvements in future air quality.
Editor: Katlenburg-Lindau: Copernicus GmbH
Idioma: Inglês

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Weakened aerosol-radiation interaction exacerbating ozone pollution in eastern China since China's clean air actions

Yang, Hao ; Chen, Lei ; Liao, Hong ; Zhu, Jia ; Wang, Wenjie ; Li, Xin

Katlenburg-Lindau: Copernicus GmbH

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