残留层臭氧向下混合对地面臭氧的影响——以胶东半岛沿海地区秋季典型臭氧污染过程为例

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Abstract Based on differential absorption ozone lidar and coherent Doppler wind lidar vertical observation, as well as surface pollutant concentration and meteorological data, a study was conducted in the coastal city of Qingdao of Jiaodong Peninsula, focusing on meteorological causes of typical ozone (O₃) pollution events occurred from October 16^th to 26^th, 2023. The study aimed to explore the vertical evolution in O₃ concentrations during the pollution events, as well as the influence of wind profiles on O₃ distribution vertically. Besides, contributions of downward mixing of residual layer O₃ affected on surface O₃ concentrations was also evaluated. The results indicated that there were two O₃ pollution events during the observation period: event I from the 17^th to 18^th, and event II from 22^nd to 25^th. O₃-8h concentrations on 18^th, 23^rd to 25^th were 197, 171, 179, and 169μg/m³, respectively. These two O₃ pollution events were associated with warming processes at 850hPa geopotential height, intensive solar radiation, nocturnal ground-based inversions, lower stable boundary layers (below 200m), and lower daily atmospheric boundary layer heights. These atmospheric meteorological conditions favored O₃ formation and air pollutants accumulation. Both two O₃ pollution events concluded with cold air advection from the north. Local O₃ production was identified as the primary cause of O₃ pollution in Jiaodong Peninsula. Persisting warmth, intense solar radiation, and unfavorable atmospheric circulation patterns led to continuous regional O₃ pollution. Moreover, transport of residual layer O₃ by the southwest low-level jet could exacerbated surface O₃ pollution within a range of 400~500km. Vertical mixing of residual layer O₃ was found to play a crucial role on surface O₃ concentrations, particularly during morning hours as the atmospheric boundary layer height increases. Between 7:00 and 12:00, the O₃ vertical transport flux in the boundary layer ranged from -20.2 to -36.0μg/(m²·s). On average, vertical mixing of residual layer O₃ contributed 26.4 % (15.1 %~43.2%) to surface O₃, with a highest contribution observed at 9:00. During event II, vertical mixing of residual layer O₃ contributed an average of 23.8 % (15.4 %~36.5 %) to surface O₃. There was no significant difference in vertical mixing contributions between pollution days and clean days. The study highlighted the importance of reducing local pollution emissions and enhancing regional collaborative control measures to effectively O₃ pollution prevention and control.

Key words： Jiaodong Peninsula ozone vertical distribution lidar residual layer

Received: 20 March 2024

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	MENG He
	WANG Wei
	ZHANG Miao
	DAI Wei
	MA Yan
	XU Yang

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MENG He,WANG Wei,ZHANG Miao等. Influence of downward-mixing ozone in the residual layer on surface ozone—cases study of typical autumn ozone pollution processes in the coastal areas of Jiaodong Peninsula[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 5950-5960.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I11/5950

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