深圳市大气甲醛四季污染特征及来源解析

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Abstract Four seasons online observation of atmospheric formaldehyde (HCHO) and other photochemical pollutants was carried out in a western urban site of Shenzhen in 2022, with the aim of analyzing the atmospheric HCHO pollution and its relationship with meteorological factors as well as identifying the main sources of HCHO by feature ratio method and principal component analysis (PCA). During sampling, the average mixing ratio of HCHO showed the highest in winter (3.67×10^-9), followed by autumn (3.29×10^-9), summer (2.39×10^-9) and spring (2.25×10^-9), and the diurnal variation of HCHO, O₃ and PAN in four seasons all presented a "diurnal single peak" feature. High temperature (>25℃) and strong solar radiation (5.5×10^-3<JNO₂<7.5×10^-3) could promote the formation of HCHO, while high relative humidity could accelerate the wet deposition of HCHO. There was a significant positive correlation between HCHO and O₃ in summer and autumn during daytime (r>0.90), while the correlation between HCHO and NO_x was not obvious, indicating the secondary generation property of HCHO during the photochemical active period in Shenzhen. The concentration ratio of formaldehyde to acetaldehyde (C₁/C₂) in autumn was the highest (3.1±0.9), followed by that in summer (2.9±1.5) and spring (2.3±0.9), with the lowest in winter (1.7±0.7). The higher C₁/C₂ in summer and autumn indicated that HCHO was significantly affected by photochemical oxidation at this time. The results of principal component analysis showed that the main sources of daytime HCHO in four seasons were secondary formation sources (40.2%), biogenic sources (31.6%) and anthropogenic primary emissions (14.5%), among which secondary formation sources and biogenic sources contributed significantly higher in summer and autumn than that in winter and spring, while the contributions of anthropogenic primary sources in winter and spring were twice those in summer and autumn.

Key words： formaldehyde Shenzhen city pollution characteristics seasonal variation principal component analysis

Received: 05 January 2023

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X511

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	Articles by authors
	HAN Heng-xiao
	XIA Shi-yong
	LUO Yao
	CAO Li-ming
	PENG Xing
	HUANG Xiao-feng
	HE Ling-yan

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HAN Heng-xiao,XIA Shi-yong,LUO Yao等. Four seasons pollution characteristics and source analysis of atmospheric formaldehyde in Shenzhen[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 3867-3876.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/3867

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