Characteristics and Sources of Organic Aerosol Markers in PM_(2.5)

Zheng Li ； Ruiwen Zhou ； Yuanyuan Li ； Min Chen ； Yachen Wang ； Tonglin Huang ； Yanan Yi ； Zhanfang Hou ； Jingjing Meng ； Li Yan

《Aerosol and Air Quality Research》 21卷9期 (2021/09) Pp. 1-17+ap1-5-012

https://doi.org/10.4209/aaqr.210180

摘要

To investigate the molecular compositions, sources, and evolution processes of organic aerosols (OAs), PM_(2.5) samples in wintertime were collected in Jinan, a typically polluted city in the North China Plain (NCP). The concentrations of PM_(2.5), carbonaceous species, and organic components (e.g., sugars, fatty acids, polycyclic aromatic hydrocarbons (PAHs) and oxygenated-PAHs (OPAHs)) in haze episodes were 1.8-2.7 times higher than those in clean episodes. Levoglucosan was the most abundant saccharide, which exhibited significant correlations with carbonaceous species during the whole sampling period, demonstrating that biomass burning has an important effect on the concentrations of carbonaceous species in PM_(2.5) of Jinan during wintertime. The higher ratios of both secondary OC/OC (SOC/OC) and C_(18:1)/C_(18:0) was observed during the clean days than those during haze days, implying that OAs during clean periods were more aged. The higher ratio of OPAHs/PAHs in the daytime reflected the more photochemical formation of OPAHs in the daytime. Positive matrix factorization (PMF) model proved that biomass burning was the major source of OAs during the whole sampling period. Potential source contribution function (PSCF) and concentration-weight trajectory (CWT) results indicating that Shandong Province and Beijing-Tianjing-Hebei (BTH) region made important contribution to the levels of PM_(2.5) in Jinan during the winter. Moreover, the CWT results showed that OAs during haze periods were largely originated from local and surrounding regions. These results confirmed that biomass burning can significantly influence the concentrations and chemical compositions of OAs, thereby they can affect human health and atmospheric chemistry.

關鍵字

Organic aerosols ； Levoglucosan ； Biomass burning ； PAHs ； Jinan city