四川盆地城市群臭氧污染时空精细演变特征的观测与模拟

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Abstract Based on air pollutants observation and meteorological data in the Sichuan Basin in August 2019, combined with the ERA5 reanalysis data, the changes of upper and lower level weather situation and ozone (O₃) pollution during the episode were examined. In addition, the high-resolution mesoscale weather forecast model WRF and multi-scale air quality model CMAQ were used to explore the formation and transport of O₃. The results showed that:①The distribution characteristics of ozone concentration were closely related to the distribution of wind direction and temperature, and the area of high O₃ value mainly located in the high temperature area and the downwind of dominant wind direction. In the process of pollution, the South Asia High and the West Pacific Subtropical High steadily controlled the entire Sichuan Basin, where 700hPa and 850hPa were controlled by the high pressure, leading to prevailing downdraft, increase of surface temperature, promotion of the rapid O₃ generation, and inhibition of the dilution and diffusion of surface O₃ to the upper air. ②The concentration and spatial distribution of O₃ at 1000m height at night were greatly affected by the distribution of O₃_8h at ground level and the transmission of wind field during the day. The low O₃ values at night were mainly located at the bottom of the basin. Chengdu and Chongqing urban areas were affected by NO titration and were the two remarkable low-value centers in the night. The high-value O₃ centers were blocked by mountains and accumulated in a zonal pattern at the edge of the basin. ③The relative contributions of different physical and chemical processes to O₃ concentration were quantified by process analysis in WRF-CMAQ model. Vertical transport processes and gas phase chemistry were the main sources of daytime O₃, dry sedimentation and horizontal advection were the main sinks of surface O₃. ④The relative contribution of city-to-city transport to O₃ concentration was estimated by ISAM comprehensive source analysis method. Under the influence of northeast wind transport, the contribution of model boundary to northeast Sichuan urban agglomeration was about 58.86%~79.23%. The southeast wind greatly affected the O₃ concentration in Chongqing, contributing about 72.50% from model boundary. The main sources of NO₂ contribution came from city itself and the surrounding regional transmission. The NO_x emission in the northeast Sichuan urban agglomeration was lower than that in other regions of the Sichuan Basin, so the NO₂ concentration imported from the model boundary and Chongqing had a greater contribution to the northeast Sichuan. ⑤Biological sources, industrial sources and transportation sources contributed significantly to O₃ concentration in the Sichuan Basin, while residential energy sources and power plants contributed less. The contribution rate of industrial sector in Chengdu, Deyang, Chongqing, Meishan, Neijiang and Yibin was relatively high.

Key words： ozone pollution transport process chemical process source contribution numerical simulation

Received: 31 May 2023

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X51

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	Articles by authors
	ZHANG Xiao-ling
	LEI Yu
	WANG Cong-cong
	WU Kai
	YANG Xian-yu
	TAN Qin-wen
	LU Cheng-wei

Cite this article:

ZHANG Xiao-ling,LEI Yu,WANG Cong-cong等. Fine-scale evolution pattern of ozone pollution in the city cluster of Sichuan Basin from observation and modeling perspectives[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(1): 1-14.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I1/1

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