2014—2021年泰安市PM2.5和O3复合污染特征及其气象成因分析

doi:10.3969/j.issn.1673-503X.2024.06.004

Abstract

Abstract:

Based on surface meteorological observation data, air pollutant monitoring data from 2014 to 2021 in Tai′an city, and ERA5 reanalysis data provided by the European Centre for Medium-Range Weather Forecasts (ECMWF), this study analyzes the characteristics of PM_2.5 and O₃ compound pollution, the meteorological causes, and the interactions between PM_2.5 and O₃ during compound pollution periods in this region.The results show that compound pollution by PM_2.5 and O₃ is a significant issue in Tai′an city, with monthly exceedance hours showing a unimodal distribution and significant seasonal variation characteristics.The compound pollution is more likely to occur under conditions of high temperature, high relative humidity, and low wind speed.Using Principal Component Analysis (PCA) and K-means clustering methods, the weather patterns associated with compound pollution in Tai′an city are classified into five types: rear of high pressure type, uniform pressure field type, saddle field type, front of weak low pressure type, and bottom of high pressure type, with the rear of high pressure type showing the highest frequency of compound pollution occurrence.Analysis of the interactions between PM_2.5 and O₃ in Tai′an city indicates significant correlations in both winter and summer.In summer, atmospheric oxidation is dominated by O₃ oxidation, and the contribution rate of atmospheric PM_2.5 concentration under various photochemical intensity levels shows that primary emissions surpass secondary formation.In winter, with weak atmospheric oxidation, increasing PM_2.5 concentrations, lead to reduced direct solar radiation and decreased O₃ peak concentrations, indicating that PM_2.5 has an inhibitory effect on O₃ formation.

Key words: Compound pollution, Meteorological factors, Weather patterns

CLC Number:

Zhaopeng LUAN,Huichao LU,Junnan SHI. Analysis of compound pollution characteristics of PM_2.5 and O₃ and their meteorological causes in Tai′an city from 2014 to 2021[J]. Journal of Meteorology and Environment, 2024, 40(6): 28-34.

Figures/Tables 8

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References 30

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类型	平均PM_2.5浓度/(μg·m^-3)	平均MDA8 O₃浓度/(μg·m^-3)	出现频率/(%)
CT1	94.0	193.0	37.5
CT2	93.7	193.3	30.0
CT3	90.0	191.0	7.5
CT4	92.2	213.3	15.0
CT5	94.0	178.5	10.0

季节	污染物浓度	气温	气压	相对湿度	风速	气象要素
夏季	PM_2.5	-0.226^**	0.153	-0.372^**	-0.220^**	0.571^**
夏季	O₃	0.411^**	-0.193	-0.584^**	-0.248^**	0.571^**
冬季	PM_2.5	-0.207^**	-0.220^**	0.468^**	-0.351^**	-0.248^*
冬季	O₃	0.429^**	-0.285^**	0.175	-0.172^*	-0.248^*

季节	OX/(μg·m^-3)	O₃/OX	OX与O₃浓度的相关系数	OX与NO₂浓度的相关系数
夏季	190.4	0.89	0.994^**	0.587^**
冬季	117.8	0.61	0.875^**	0.411^**

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Analysis of compound pollution characteristics of PM_2.5 and O₃ and their meteorological causes in Tai′an city from 2014 to 2021

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Analysis of compound pollution characteristics of PM2.5 and O3 and their meteorological causes in Tai′an city from 2014 to 2021

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Analysis of compound pollution characteristics of PM_2.5 and O₃ and their meteorological causes in Tai′an city from 2014 to 2021