Variability in Aromatic Aerosol Yields under Very Low NO_x Conditions at Different HO2/RO2 Regimes

Weihan Peng; Chen Le; William C. Porter

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Variability in Aromatic Aerosol Yields under Very Low NO_x Conditions at Different HO2/RO2 Regimes

机译：Variability in Aromatic Aerosol Yields under Very Low NO_x Conditions at Different HO2/RO2 Regimes

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Current chemical transport models generally use a constant secondary organic aerosol (SOA) yield to represent SOA formation from aromatic compounds under low NO_x conditions. However, a wide range of SOA yields (10 to 42%) from m-xylene under low NO_x conditions is observed in this study. The chamber HO2/ RO2 ratio is identified as a key factor explaining SOA yield variability: higher SOA yields are observed for runs with a higher HO2/RO2 ratio. The RO2 + RO2 pathway, which can be increasingly significant under low NO_x and HO2/RO2 conditions, shows a lower SOA-forming potential compared to the RO2 + HO2 pathway. While the traditional low-NO_x chamber experiments are commonly used to represent the RO2 + HO2 pathway, this study finds that the impacts of the RO2 + RO2 pathway cannot be ignored under certain conditions. We provide guidance on how to best control for these two pathways in conducting chamber experiments to best obtain SOA yield curves and quantify the contributions from each pathway. On the global scale, the chemical transport model GEOS-Chem is used to identify regions characterized by lower surface HO2/RO2 ratios, suggesting that the RO2 + RO2 pathway is more likely to prove significant to overall SOA yields in those regions. Current models generally do not consider the RO2 + RO2 impacts on aromatic SOA formation, but preliminary sensitivity tests with updated SOA yield parameters based on such a pathway suggest that without this consideration, some types of SOA may be overestimated in regions with lower HO2/RO2 ratios.

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《Environmental Science & Technology: ES&T》 |2022年第2期|750-760|共11页
作者
Weihan Peng; Chen Le; William C. Porter;
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作者单位

Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, Riverside, California 92507, United States;

Department of Environmental Sciences, University of California, Riverside, Riverside, California 92521, United States;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
secondary organic aerosol; SOA; aromatic; chamber; GEOS-Chem; HO2; RO2;

Variability in Aromatic Aerosol Yields under Very Low NO_x Conditions at Different HO2/RO2 Regimes

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