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- Title
Characterization of Submicron Organic Particles in Beijing During Summertime: Comparison Between SP-AMS and HR-AMS.
- Authors
Wang, Junfeng; Ye, Jianhuai; Liu, Dantong; Wu, Yangzhou; Zhao, Jian; Xu, Weiqi; Xie, Conghui; Shen, Fuzhen; Zhang, Jie; Ohno, Paul E.; Qin, Yiming; Zhao, Xiuyong; Martin, Scot T.; Lee, Alex K. Y.; Fu, Pingqing; Jacob, Daniel J.; Zhang, Qi; Sun, Yele; Chen, Mindong; Ge, Xinlei
- Abstract
Black carbon (BC) particles in Beijing summer haze play an important role in regional radiation balance and related environmental processes. Understanding the factors that lead to variability in the impacts of BC remains limited. Here, we present observations by a soot-particle aerosol mass spectrometer of BC-containing submicron particulate matter (BC-PM1) in the summer of 2017 in Beijing, China. These observations were compared to concurrently measured total non-refractory submicron particulate matter (NR-PM1) by a high-resolution aerosol mass spectrometer (HR-AMS). Distinct properties were observed between NR-PM1 and BC-PM1 related to organic aerosol (OA) composition with hydrocarbon-like OA in BC-PM1 up to two-fold higher than that in NR-PM1 in fresh vehicle emissions, suggesting that a part of HOA in BC-PM1 may be overestimated due to the change of the collection efficiency of SP-AMS. Cooking-related OA was only identified in NR-PM1, whereas aged biomass burning OA (A-BBOA) was a unique factor only identified in BC-PM1. The A-BBOA was linked to those heavily coated BC, which may lead to enhancement of light absorption ability of BC by a factor of two via the "lensing effect". More-oxidized oxygenated OA identified in BC-containing particles was found to be slightly different from that observed by HR-AMS, mainly due to the influence of A-BBOA. Overall, these findings highlight that BC in urban Beijing is partly of agricultural fire origin and, a unique biomass burning-related OA associated with BC may be ubiquitous in aged BC-PM1, and this OA may play a role in affecting air quality and climate that has not previously been fully considered.
- Subjects
BEIJING (China); PARTICULATE matter; SOOT; HAZE; SUMMER; BIOMASS burning; AIR quality; MASS spectrometers
- Publication
Atmospheric Chemistry & Physics Discussions, 2020, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2020-750