基于数值模拟天津臭氧污染特征及其气象影响评估分析方法研究

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Abstract To address the issue of biases in the representational capabilities of existing assessment methods for ozone pollution meteorological conditions, stemming from a lack of boundary layer indicators, this study utilized meteorological and environmental observation data collected from 2019 to 2023. By integrating ozone numerical simulations and incorporating source tracking along with process rate analysis techniques within the model framework, we developed a joint model and observation-based Tianjin Ozone Pollution Meteorological Condition Assessment Index (OWI). This index aims to accurately assess ozone pollution meteorological conditions in Tianjin. The research findings reveal a strong correlation between ozone concentrations and various meteorological factors. The OWI index was constructed based on parameters such as average temperature, maximum temperature, relative humidity, daily precipitation, daytime ultraviolet radiation, midday ultraviolet radiation, sunshine duration, average wind speed, and wind direction. It effectively characterizes the impact of these meteorological conditions on ozone levels. Notably, this index exhibits a correlation coefficient of 0.82 with O₃ concentration and demonstrates an ability to identify 82% of mild or more severe ozone pollution incidents. Furthermore, by analyzing the effects of daytime and nighttime boundary layer heights on precursor diffusion processes—such as near-surface nitrogen oxide titration and vertical exchange of ozone—the study addresses potential overestimations in O₃ concentrations by the OWI index under favorable vertical diffusion conditions. To optimize the OWI index further, we incorporated indicators for both daytime and nighttime boundary layer heights. Through ozone numerical simulations, the study calculated the effects of horizontal and vertical transport, convection, chemical generation, turbulent mixing, and regional transport on ozone levels. By combining simulation results with observations, the OWI index was oized under specific conditions, such as adjusting upwards when daytime vertical transport exceeds 15μg/(m³×h) or daytime ozone chemical generation exceeds 20μg/(m³×h); and considering surrounding meteorological conditions and ozone transport impacts when regional transport was too strong.

Key words： ozone pollution weather condition assessment environmental models boundary layer Tianjin

Received: 06 September 2024

PACS:

X513

Corresponding Authors: 蔡子颖,责任作者,正高级工程师,120078030@163.com E-mail: 120078030@163.com

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	CAI Zi-ying
	HAO Jian
	ZHANG-min
	FAN Wen-yan
	HAN Su-qin
	QIU Xiao-bin
	TANG Yin-xiao
	YANG Xu
	YAO Qing

Cite this article:

CAI Zi-ying,HAO Jian,ZHANG-min等. Research on the characteristics of ozone pollution and meteorological impact assessment method in Tianjin based on numerical simulation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(4): 1810-1819.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I4/1810

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