2019年8月太原市一次典型O3和PM2.5污染天气过程成因分析

doi:10.3969/j.issn.1673-503X.2023.06.004

Abstract

Abstract:

Using the near-surface O₃, PM_2.5, meteorological elements, weather patterns, NCEP reanalysis data, and particulate laser radar data in Taiyuan city, combined with a backward trajectory model, the characteristics and causes of a typical O₃ and PM_2.5 pollution weather process occurred from August 19 to 20, 2019, in Taiyuan city were analyzed.The results indicate that during this pollution event, the concentration of O₃ peaks earlier than that of PM_2.5.On the 19th, the concentration of O₃ is high and lasts for a long time, whereas on the 20th, the concentration of PM_2.5 increases, but that of O₃ significantly decreases.The stable layer of low wind and high temperature before the Hetao trough provides favorable conditions for the accumulation of O₃ and PM_2.5 on the 19th.The decrease of boundary layer height and easterly air transport led to the increase of O₃ and PM_2.5 concentrations after sunset on the 19th.Subsequently, the upward movement of the ground and the development of the boundary layer during the transit of the trough reduce the O₃ and PM_2.5 pollution near the ground to a certain extent.After the transit of the cold front on the 20th, the reduced height of the boundary layer and the high humidity environment provide favorable meteorological conditions for the rapid accumulation of PM_2.5 near the ground.During the period when particulate pollution was dominant, the main reason for the low O₃ concentration on the 20th is the decrease of near-ground solar radiation caused by low temperature and sudden increase of PM_2.5 concentration.On the 19th, the high concentration of O₃ pollution is mainly affected by the airflow from the southeast direction, while on the 20th, the airflow from central and southern Henan and the sand mass from Inner Mongolia are the main reasons for the increase of PM_2.5 concentration.

Key words: Boundary layer height, Particulate pollution, Backward trajectory

CLC Number:

X513/X515

Wenya WANG,Lingyun ZHU,Wei GUO,Yan WANG,Ling CHEN. Analysis of the causes of a typical O₃ and PM_2.5 pollution weather process in Taiyuan city in August 2019[J]. Journal of Meteorology and Environment, 2023, 39(6): 28-36.

Figures/Tables 8

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Table 1

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日期	轨迹	占比/(%)	O₃/(μg·m^-3)	PM_2.5/(μg·m^-3)	PM_2.5/CO	风速/(m·s^-1)
	1	37.50	60.44	26.33	31.35	2.46
8月19日	2	33.33	171.50	41.75	42.17	3.01
	3	29.17	201.86	49.57	48.13	3.10
	1	33.33	101.38	69.13	59.09	4.26
8月20日	2	41.67	116.40	49.90	56.07	4.00
	3	25.00	50.50	59.67	47.74	5.84

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Analysis of the causes of a typical O₃ and PM_2.5 pollution weather process in Taiyuan city in August 2019

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Analysis of the causes of a typical O3 and PM2.5 pollution weather process in Taiyuan city in August 2019

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Analysis of the causes of a typical O₃ and PM_2.5 pollution weather process in Taiyuan city in August 2019