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 NOx 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.
韩恒霄, 夏士勇, 罗遥, 曹礼明, 彭杏, 黄晓锋, 何凌燕. 深圳市大气甲醛四季污染特征及来源解析[J]. 中国环境科学, 2023, 43(8): 3867-3876.
HAN Heng-xiao, XIA Shi-yong, LUO Yao, CAO Li-ming, PENG Xing, HUANG Xiao-feng, HE Ling-yan. Four seasons pollution characteristics and source analysis of atmospheric formaldehyde in Shenzhen. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 3867-3876.
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