天津大气扩散条件对污染物垂直分布的影响研究

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Abstract Using the air pollutant monitoring data and meteorological observation data in summer and winter during 2017~2019 in Tianjin, the effects of atmospheric vertical diffusion conditions on PM_2.5 and O₃ were studied based on the vertical observation of Tianjin Meteorological Tower. The results showed that the mass concentration of near-surface PM_2.5 decreased with height, while the concentration of O₃ increased with height. Influenced by the seasonal and diurnal variation of atmospheric turbulence intensity, there was a significant correlation between the PM_2.5 mass concentration on the ground and at 120m height, but insignificant correlation between the PM_2.5 mass concentration on the ground and at 200m height in winter. In summer, the correlation coefficient of PM_2.5 mass concentration at 120m and 200m height was 0.72 and the PM_2.5 mass concentration at 120m and 200m height were even higher than the ground in the afternoon. In summer, the difference of O₃ mass concentration at different heights is lower than that in winter, and the O₃ mass concentration were close to the ground at 120m height. Atmospheric stability, temperature inversion intensity, and temperature decline rate were taken as atmospheric vertical diffusion indexes, which had certain indicator effects on the vertical gradient of PM_2.5 and O₃. The correlation coefficient between TKE and PM_2.5 mass concentration was -0.65 in winter, and that between TKE and ΔPM_2.5 in summer was -0.39. The correlation coefficients between TKE and O₃ concentration were 0.46 and 0.53, in summer and winter respectively. The correlation coefficients between TKE and ΔO₃ concentration were 0.73 and 0.70, in summer and winter respectively. The weak downdraft has an obvious influence on the increase of O₃ concentration. The correlation coefficients between the vertical velocity at 40m height and O₃ concentration were -0.54 and -0.61 in winter and summer, respectively. Through the analysis of a typical PM_2.5 heavy pollution process and typical O₃ pollution processes, it is found that the changes of atmospheric stability, temperature decline rate and TKE were closely related to the generation, extinction, maintenance and variation of PM_2.5 pollutants. The formation of O₃ pollution near the surface was closely related to favorable photochemical reactions. In addition, the transport influence of downdraft should also be paid attention to during O₃ pollution processes.

Key words： PM_2.5 O₃ meteorological tower atmospheric vertical diffusion conditions Tianjin

Received: 02 September 2021

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X513

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	Articles by authors
	LIU Jing-le
	SHI Jing
	YAO Qing
	CAI Zi-ying
	HAN Su-qin
	JIANG Ming
	CUI Ye

Cite this article:

LIU Jing-le,SHI Jing,YAO Qing等. Effects of atmospheric diffusion conditions on vertical distribution of pollutants in Tianjin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1575-1584.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I4/1575

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