基于OLI和TROPOMI卫星数据的北京市臭氧前体物研究

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Abstract Formaldehyde (HCHO) and nitrogen dioxide (NO₂) are important precursors to ozone. HCHO to NO₂ ratio (FNR) indicates the sensitivity of ozone production, serving as a primary reference for ozone pollution control. This study enhances the spatial resolution of TROPOMI HCHO and NO₂ columns by oversampling algorithms, and reduces the uncertainty of TROPOMI data. It reveals the spatial distribution characteristics of HCHO and NO₂ in Beijing during the summer of 2021. Based on FNR, the study diagnoses the sensitivity of ozone production in the Beijing areas. The study utilizes Landsat 8OLI data to calculate environmental indices and the proportion of impervious surfaces in the Beijing areas, and analyses their relationships with HCHO, NO₂, and FNR. This Study aims to reveal the relationship between the degree of urbanization and the emissions of O₃, VOCs, and NO_x in Beijing. It finds that high NO₂ columns are mainly distributed in the center of Beijing urban areas, with significantly reduced NO₂ columns in non-urban areas. The mean NO₂ columns increases with the proportion of impervious surfaces, but their standard deviation decreases, indicating that as urbanization in the urban areas of Beijing intensifies, the differences in NO₂ emissions within urban areas diminish. The HCHO columns in urban Beijing are generally higher than those in non-urban areas, but the contribution of isoprene emissions from vegetation somewhat mitigates the disparity in VOCs emissions caused by the urbanization degree differences. Ozone in the urban area of Beijing and eastern Langfang area is controlled by VOCs, while ozone in the northern suburbs of Beijing is primarily controlled by NO_x. The FNR mean decreases with an increase in the proportion of impervious surfaces, indicating that as urbanization in the Beijing area advances, the sensitivity of ozone production gradually shifts to a VOCs-controlled mechanism.

Key words： TROPOMI Landsat 8 OLI HCHO VOCs NO_x

Received: 14 December 2023

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	PU Dong-chuan
	WANG Da-kang
	ZHU Lei
	YANG Xian-kun
	WANG Jin-nian

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PU Dong-chuan,WANG Da-kang,ZHU Lei等. Study on ozone precursors in Beijing based on OLI and TROPOMI satellite data[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(7): 3592-3600.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I7/3592

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