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Nontarget Screening Exhibits a Seasonal Cycle of PM2.5 Organic Aerosol Composition in Beijing
Ma, Jialiang; Ungeheuer, Florian; Zheng, Feixue; Du, Wei; Wang, Yonghong; Cai, Jing; Zhou, Ying; Yan, Chao; Liu, Yongchun; Kulmala, Markku; Daellenbach, Kaspar R.; Vogel, Alexander L.
AbstractThe molecular composition of atmospheric particulate matter(PM) in the urban environment is complex, and it remains a challenge toidentify its sources and formation pathways. Here, we report the seasonalvariation of the molecular composition of organic aerosols (OA), based on 172PM2.5filter samples collected in Beijing, China, from February 2018 to March2019. We applied a hierarchical cluster analysis (HCA) on a large nontarget-screening data set and found a strong seasonal difference in the OA chemicalcomposition. Molecularfingerprints of the major compound clusters exhibit aunique molecular pattern in the Van Krevelen-space. We found that summerOA in Beijing features a higher degree of oxidation and a higher proportion oforganosulfates (OSs) in comparison to OA during wintertime, which exhibits ahigh contribution from (nitro-)aromatic compounds. OSs appeared with a highintensity in summer-haze conditions, indicating the importance of anthro-pogenic enhancement of secondary OA in summer Beijing. Furthermore, wequantified the contribution of the four main compound clusters to total OA using surrogate standards. With this approach, we areable to explain a small fraction of the OA (similar to 11-14%) monitored by the Time-of-Flight Aerosol Chemical Speciation Monitor(ToF-ACSM). However, we observe a strong correlation between the sum of the quantified clusters and OA measured by the ToF-ACSM, indicating that the identified clusters represent the major variability of OA seasonal cycles. This study highlights the potentialof using nontarget screening in combination with HCA for gaining a better understanding of the molecular composition and theorigin of OA in the urban environment.
Department大气环境与污染控制实验室 ; 大气环境与污染控制实验室
Document Type期刊论文
Affiliation1.Goethe Univ Frankfurt, Inst Atmospher & Environm Sci, D-60438 Frankfurt, Germany
2.Beijing Univ Chem Technol, Beijing Adv Innovat Ctr Soft Matter Sci & Engn, Aerosol & Haze Lab, Beijing 100029, Peoples R China
3.Univ Helsinki, Fac Sci, Inst Atmospher & Earth Syst Res Phys, Helsinki 00014, Finland
4.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
5.Paul Scherrer Inst, Lab Atmospher Chem, CH-5232 Villigen, Switzerland
Recommended Citation
GB/T 7714
Ma, Jialiang,Ungeheuer, Florian,Zheng, Feixue,et al. Nontarget Screening Exhibits a Seasonal Cycle of PM2.5 Organic Aerosol Composition in Beijing[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2022,56(11):7017-7028.
APA Ma, Jialiang.,Ungeheuer, Florian.,Zheng, Feixue.,Du, Wei.,Wang, Yonghong.,...&Vogel, Alexander L..(2022).Nontarget Screening Exhibits a Seasonal Cycle of PM2.5 Organic Aerosol Composition in Beijing.ENVIRONMENTAL SCIENCE & TECHNOLOGY,56(11),7017-7028.
MLA Ma, Jialiang,et al."Nontarget Screening Exhibits a Seasonal Cycle of PM2.5 Organic Aerosol Composition in Beijing".ENVIRONMENTAL SCIENCE & TECHNOLOGY 56.11(2022):7017-7028.
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