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| Sizing and source characterization of particulate organic nitrates based on long time-of-flight aerosol mass spectrometer (Long-ToF-AMS) in Shenzhen |
| YU Guang-he1, CAO Li-ming1,2, ZHU Qiao2, WANG Chuan1, HUANG Xiao-feng2 |
1. Peking University-Hong Kong University of Science and Technology Shenzhen Hong Kong Institution, Shenzhen 518055, China;
2. Shenzhen Graduate School, Key Laboratory for Urban Habitat Environmental Science and Technology, Peking University, Shenzhen 518055, China |
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Abstract In this study, a long time-of-flight aerosol mass spectrometer (Long- ToF-AMS) was applied to characterize particulate organic nitrates (pON) during March 30th to April 17th in 2021 at Shenzhen. Using cross-validation estimated methods, we calculated pON accounting for 5.08%~11.00% in total OA. The diurnal pattern with nighttime higher mass loading for pON and the best correlation with less-oxidized oxygenated OA (LO-OOA) at night indicated that pON formation might be more associated with nighttime fresh secondary formation. The high-resolution size distribution of pON showed they contained a substantial fraction of smaller size particles, further confirming the contributions from primary aerosols or newly formed secondary aerosols at night. Additionally, the potential precursors for pON formation was further explored based on comparison analysis between mass spectrum of our ambient data and the laboratory generated pON using different precursors. The results implied that volatile organic compounds (VOCs) emitted from biogenic sources and biomass burning were potential precursors for pON formation in Shenzhen.
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Received: 06 September 2021
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