Preprints
https://doi.org/10.5194/acp-2022-752
https://doi.org/10.5194/acp-2022-752
 
14 Nov 2022
14 Nov 2022
Status: this preprint is currently under review for the journal ACP.

Impact of aerosol optics on vertical distribution of ozone

Shuqi Yan2, Bin Zhu1, Shuangshuang Shi1, Wen Lu1, Jinhui Gao3, Hanqing Kang1, and Duanyang Liu2 Shuqi Yan et al.
  • 1Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), Special Test Field of National Integrated Meteorological Observation, Nanjing University of Information Science & Technology, Nanjing 210044, China
  • 2Key Laboratory of Transportation Meteorology of China Meteorological Administration, Nanjing Joint Institute for Atmospheric Sciences, Nanjing 210041, China
  • 3Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China

Abstract. Tropospheric ozone, an important secondary pollutant, is greatly impacted by aerosols within boundary layer (BL). Previous studies have mainly attributed ozone variation to either aerosol-BL or aerosol-photolysis interactions at near surface. In this study, we analyze the sensitivities of ozone response to aerosol mixing states (e.g., mixing behaviour hypothesis of scattering and absorbing components) in the vertical direction and address the effects of aerosol-BL and aerosol-photolysis interactions on ozone profiles by WRF-Chem simulations. The aerosol internal mixing state experiment reasonably reproduces the vertical distribution and time variation of meteorological elements and ozone. Sensitive experiments show that aerosols lead to turbulent suppression, precursor accumulation, lower-level photolysis reduction and upper-level photolysis enhancement. Consequently, ozone basically decreases within entire BL during daytime (08:00~17:00), and the decrease is the least in external mixing state (0.6 %) compared with internal (9.8 %) and core-shell mixing states (7.4 %). The photolysis enhancement is the most significant in external mixing state due to its strong scattering ability. By process analysis, lower-level ozone chemical loss is enhanced due to photolysis reduction and NOX accumulation under VOC-limited regime. Upper-level ozone chemical production is accelerated due to higher photolysis rate resulting from aerosol backscattering. Therefore, the increased ozone entrainment from aloft BL to surface induced by boosted ozone vertical gradient outweighs the decreased ozone entrainment induced by turbulent suppression after 11:00 am. Additional simulations support that aerosol effect on precursor, photolysis and ozone is consistent under different underlying surface and pollution conditions.

Shuqi Yan et al.

Status: open (until 26 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Shuqi Yan et al.

Shuqi Yan et al.

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Short summary
We analyze the ozone response to aerosol mixing states in the vertical direction by WRF-Chem simulations. Aerosols generally lead to turbulent suppression, precursor accumulation, low-level photolysis reduction and upper-level photolysis enhancement under different underlying surface and pollution conditions. Consequently, ozone basically decreases within entire BL during daytime, and the decrease is the least in aerosol external mixing state compared with internal and core-shell mixing states.
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