Secondary organic aerosol formed by condensing anthropogenic vapours over China’s megacities

Nie, Wei; Yan, Chao; Huang, Dan Dan; Wang, Zhe; Liu, Yuliang; Qiao, Xiaohui; Guo, Yishuo; Tian, Linhui; Zheng, Penggang; Xu, Zhifei; Li, Yuanyuan; Xu, Zheng; Qi, Ximeng; Sun, Peng; Wang, Jiaping; Zheng, Feixue; Li, Xiaoxiao; Yin, Rujing; Daellenbach, Kaspar R.; Bianchi, Federico; Petäj̈ä, Tuukka; Zhang, Yanjun; Wang, Mingyi; Schervish, Meredith; Wang, Sainan; Qiao, Liping; Wang, Qian; Zhou, Min; Wang, Hongli; Yu, Chuan; Yao, Dawen; Guo, Hai; Ye, Penglin; Lee, Shuncheng; Li, Yong Jie; Liu, Yongchun; Chi, Xuguang; Kerminen, Veli‐Matti; Ehn, Mikael; Donahue, Neil M.; Wang, Tao; Huang, Cheng; Kulmala, Markku; Worsnop, Douglas R.; Jiang, Jingkun; Ding, Aijun

doi:10.1038/s41561-022-00922-5

Cited by 87 publications

(173 citation statements)

References 59 publications

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“…A recently developed workflow, based on the molecular composition and the up-to-date knowledge of atmospheric OOM formation chemistry, was used for retrieving their possible sources (Xu et al, 2021;Nie et al, 2022). In this approach, mass spectral binning combined with positive matrix factorization (binPMF; Zhang et al, 2019) needs to be performed first to extract the factor of monoterpene OOMs.…”

Section: A Revised Workflow For the Classification Of Oom Sourcesmentioning

confidence: 99%

“…To our best knowledge, this is the common case for all nitrogen-containing compounds formed through the reaction between RO 2 and NO x (Orlando and Tyndall, 2012;Seinfeld and Pandis, 2016). Exceptions are those nitrophenols Wang et al, 2019;Song et al, 2021) that were classified separately (Nie et al, 2022). The reason for choosing nO eff rather than nO is that it better reflects the oxidation state of closed-shell molecules and their parent RO 2 radicals.…”

Section: A Revised Workflow For the Classification Of Oom Sourcesmentioning

confidence: 99%

“…OOMs with DBE values of 2 are rather complex. Their precursors could be aromatics, aliphatics, or other unknown sources, and a detailed discussion of the classification criteria can be found in Nie et al (2022).…”

Section: A Revised Workflow For the Classification Of Oom Sourcesmentioning

confidence: 99%

“…For example, a recent study found that some aliphatic VOCs were able to produce OOMs with DBE values of 2-3 and nO eff no smaller than 6 (Wang et al, 2021), which, however, are classified as aromatic OOMs in the workflow. Nie et al (2022) have tested the performance of the workflow on OOMs from . Results show that the accuracy is almost 100 % for OOMs from n decane and ∼ 75 % for OOMs from cyclohexane (Nie et al, 2022).…”

Section: A Revised Workflow For the Classification Of Oom Sourcesmentioning

confidence: 99%

“…In both NPF and SOA formation processes, oxygenated organic molecules (OOMs; see the definition in Sect. S2 the work of Nie et al, 2022) have been acknowledged as an important contributor, and thus, advanced understanding of OOMs is crucial.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal variation in oxygenated organic molecules in urban Beijing and their contribution to secondary organic aerosol

Guo

Yan²,

Liu³

et al. 2022

Atmos. Chem. Phys.

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Abstract. Oxygenated organic molecules (OOMs) are crucial for atmospheric new particle formation and secondary organic aerosol (SOA) growth. Therefore, understanding their chemical composition, temporal behavior, and sources is of great importance. Previous studies on OOMs mainly focus on environments where biogenic sources are predominant, yet studies on sites with dominant anthropogenic emissions, such as megacities, have been lacking. Here, we conducted long-term measurements of OOMs, covering four seasons of the year 2019, in urban Beijing. The OOM concentration was found to be the highest in summer (1.6×108 cm−3), followed by autumn (7.9×107 cm−3), spring (5.7×107 cm−3) and winter (2.3×107 cm−3), suggesting that enhanced photo-oxidation together with the rise in temperature promote the formation of OOMs. Most OOMs contained 5 to 10 carbon atoms and 3 to 7 effective oxygen atoms (nOeff=nO-2×nN). The average nOeff increased with increasing atmospheric photo-oxidation capacity, which was the highest in summer and the lowest in winter and autumn. By performing a newly developed workflow, OOMs were classified into the following four types: aromatic OOMs, aliphatic OOMs, isoprene OOMs, and monoterpene OOMs. Among them, aromatic OOMs (29 %–41 %) and aliphatic OOMs (26 %–41 %) were the main contributors in all seasons, indicating that OOMs in Beijing were dominated by anthropogenic sources. The contribution of isoprene OOMs increased significantly in summer (33 %), which is much higher than those in the other three seasons (8 %–10 %). Concentrations of isoprene (0.2–5.3×107 cm−3) and monoterpene (1.1–8.4×106 cm−3) OOMs in Beijing were lower than those reported at other sites, and they possessed lower oxygen and higher nitrogen contents due to high NOx levels (9.5–38.3 ppbv – parts per billion by volume) in Beijing. With regard to the nitrogen content of the two anthropogenic OOMs, aromatic OOMs were mainly composed of CHO and CHON species, while aliphatic OOMs were dominated by CHON and CHON2 ones. Such prominent differences suggest varying formation pathways between these two OOMs. By combining the measurements and an aerosol dynamic model, we estimated that the SOA growth rate through OOM condensation could reach 0.64, 0.61, 0.41, and 0.30 µg m−3 h−1 in autumn, summer, spring, and winter, respectively. Despite the similar concentrations of aromatic and aliphatic OOMs, the former had lower volatilities and, therefore, showed higher contributions (46 %–62 %) to SOA than the latter (14 %–32 %). By contrast, monoterpene OOMs and isoprene OOMs, limited by low abundances or high volatilities, had low contributions of 8 %–12 % and 3 %–5 %, respectively. Overall, our results improve the understanding of the concentration, chemical composition, seasonal variation, and potential atmospheric impacts of OOMs, which can help formulate refined restriction policy specific to SOA control in urban areas.

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Section: A Revised Workflow For the Classification Of Oom Sourcesmentioning

confidence: 99%

Section: A Revised Workflow For the Classification Of Oom Sourcesmentioning

confidence: 99%

Section: A Revised Workflow For the Classification Of Oom Sourcesmentioning

confidence: 99%

Section: A Revised Workflow For the Classification Of Oom Sourcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seasonal variation in oxygenated organic molecules in urban Beijing and their contribution to secondary organic aerosol

Guo

Yan²,

Liu³

et al. 2022

Atmos. Chem. Phys.

Self Cite

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Recent Progress in Atmospheric Chemistry Research in China: Establishing a Theoretical Framework for the “Air Pollution Complex”

et al. 2023

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Atmospheric chemistry research has been growing rapidly in China in the last 25 years since the concept of the “air pollution complex” was first proposed by Professor Xiaoyan TANG in 1997. For papers published in 2021 on air pollution (only papers included in the Web of Science Core Collection database were considered), more than 24 000 papers were authored or co-authored by scientists working in China. In this paper, we review a limited number of representative and significant studies on atmospheric chemistry in China in the last few years, including studies on (1) sources and emission inventories, (2) atmospheric chemical processes, (3) interactions of air pollution with meteorology, weather and climate, (4) interactions between the biosphere and atmosphere, and (5) data assimilation. The intention was not to provide a complete review of all progress made in the last few years, but rather to serve as a starting point for learning more about atmospheric chemistry research in China. The advances reviewed in this paper have enabled a theoretical framework for the air pollution complex to be established, provided robust scientific support to highly successful air pollution control policies in China, and created great opportunities in education, training, and career development for many graduate students and young scientists. This paper further highlights that developing and low-income countries that are heavily affected by air pollution can benefit from these research advances, whilst at the same time acknowledging that many challenges and opportunities still remain in atmospheric chemistry research in China, to hopefully be addressed over the next few decades.

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Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region

Wang

Nie

et al. 2023

Front. Environ. Sci. Eng.

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Organic aerosol (OA) is a major component of atmospheric particulate matter (PM) with complex composition and formation processes influenced by various factors. Emission reduction can alter both precursors and oxidants which further affects secondary OA formation. Here we provide an observational analysis of secondary OA (SOA) variation properties in Yangtze River Delta (YRD) of eastern China in response to large scale of emission reduction during Chinese New Year (CNY) holidays from 2015 to 2020, and the COVID-19 pandemic period from January to March, 2020. We found a 17% increase of SOA proportion during the COVID lockdown. The relative enrichment of SOA is also found during multi-year CNY holidays with dramatic reduction of anthropogenic emissions. Two types of oxygenated OA (OOA) influenced by mixed emissions and SOA formation were found to be the dominant components during the lockdown in YRD region. Our results highlight that these emission-reduction-induced changes in organic aerosol need to be considered in the future to optimize air pollution control measures. Electronic Supplementary Material Supplementary material is available in the online version of this article at 10.1007/s11783-023-1714-0 and is accessible for authorized users.

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Secondary organic aerosol formed by condensing anthropogenic vapours over China’s megacities

Cited by 87 publications

References 59 publications

Seasonal variation in oxygenated organic molecules in urban Beijing and their contribution to secondary organic aerosol

Seasonal variation in oxygenated organic molecules in urban Beijing and their contribution to secondary organic aerosol

Recent Progress in Atmospheric Chemistry Research in China: Establishing a Theoretical Framework for the “Air Pollution Complex”

Response of organic aerosol characteristics to emission reduction in Yangtze River Delta region

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