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Seasonal variations in the sources of organic aerosol in Xi'an, Northwest China: The importance of biomass burning and secondary formation
Zhong, Haobin1,2; Huang, Ru Jin1,3; Duan, Jing1,2; Lin, Chunshui1; Gu, Yifang1,2; Wang, Ying1,2; Li, Yongjie4; Zheng, Yan5; Chen, Qi5; Chen, Yang6; Dai, Wenting1; Ni, Haiyan1; Chang, Yunhua7; Worsnop, Douglas R.8; Xu, Wei1,9; Ovadnevaite, Jurgita9; Ceburnis, Darius9; O'Dowd, Colin D.9
Source PublicationScience of the Total Environment

The Guanzhong basin is a part of the three top priority regions in China's blue sky action as of 2019. Understanding the chemical composition, sources, and atmospheric process of aerosol in this region is therefore imperative for improving air quality. In this study, we present, for the first time, the seasonal variations of organic aerosol (OA) in Xi'an, the largest city in the Guanzhong basin. Biomass burning OA (BBOA) and oxidized OA (OOA) contributed >50% of OA in both autumn and winter. The average concentrations of BBOA in autumn (14.8 ± 5.1 μg m) and winter (11.6 ± 6.8 μg m) were similar. The fractional contribution of BBOA to total OA, however, decreased from 31.9% in autumn to 15.3% in winter, because of enhanced contributions from other sources in winter. The OOA fraction in OA increased largely from 20.9% in autumn to 34.9% in winter, likely due to enhanced emissions of precursors and stagnant meteorological conditions which facilitate the accumulation and secondary formation. A large increase in OOA concentration was observed during polluted days, by a factor of ~4 in autumn and ~6 in winter compared to clean days. In both seasons, OOA formation was most likely dominated by photochemical oxidation when aerosol liquid water content was <30 μg m or by aqueous-phase processes when O was <35 ppb. A higher concentration of BBOA was observed for air masses circulated within the Guanzhong basin (16.5–18.1 μg m), compared to air masses from Northwest and West (10.9–14.5 μg m). Furthermore, compared with OA fraction in non-refractory PM in other regions of China, BBOA (17–19%) and coal combustion OA (10–20%) were major emission sources in the Guanzhong Basin and the BTH region, respectively, whereas OOA (10–34%) was an important source in all studied regions.

KeywordBiomass Burning Haze Pollution Secondary Organic Aerosol The Guanzhong Basin
URLView the original
Indexed BySCIE
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000553728100013
Scopus ID2-s2.0-85085911881
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Document TypeJournal article
CollectionFaculty of Science and Technology
Corresponding AuthorHuang, Ru Jin
Affiliation1.State Key Laboratory of Loess and Quaternary Geology (SKLLQG), Center for Excellence in Quaternary Science and Global Change, Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China
2.University of Chinese Academy of Sciences, Beijing, 100049, China
3.Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, 710049, China
4.Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau, Taipa, 999078, China
5.State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
6.Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China
7.Yale-NUIST Center on Atmospheric Environment, Nanjing University of Information Science & Technology, Nanjing, 210044, China
8.Aerodyne Research, Inc., Billerica, United States
9.School of Physics and Centre for Climate and Air Pollution Studies, Ryan Institute, National University of Ireland Galway, Galway, University Road, H91CF50, Ireland
Recommended Citation
GB/T 7714
Zhong, Haobin,Huang, Ru Jin,Duan, Jing,et al. Seasonal variations in the sources of organic aerosol in Xi'an, Northwest China: The importance of biomass burning and secondary formation[J]. Science of the Total Environment,2020,737:139666.
APA Zhong, Haobin,Huang, Ru Jin,Duan, Jing,Lin, Chunshui,Gu, Yifang,Wang, Ying,Li, Yongjie,Zheng, Yan,Chen, Qi,Chen, Yang,Dai, Wenting,Ni, Haiyan,Chang, Yunhua,Worsnop, Douglas R.,Xu, Wei,Ovadnevaite, Jurgita,Ceburnis, Darius,&O'Dowd, Colin D..(2020).Seasonal variations in the sources of organic aerosol in Xi'an, Northwest China: The importance of biomass burning and secondary formation.Science of the Total Environment,737,139666.
MLA Zhong, Haobin,et al."Seasonal variations in the sources of organic aerosol in Xi'an, Northwest China: The importance of biomass burning and secondary formation".Science of the Total Environment 737(2020):139666.
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