气候变化领域集成服务门户(CCPortal): Rapid dark aging of biomass burning as an overlooked source of oxidized organic aerosol

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DOI	10.1073/PNAS.2010365117
	Rapid dark aging of biomass burning as an overlooked source of oxidized organic aerosol
	Kodros J.K.; Papanastasiou D.K.; Paglione M.; Masiol M.; Squizzato S.; Florou K.; Skyllakou K.; Kaltsonoudis C.; Nenes A.; Pandis S.N.
发表日期	2021
ISSN	00278424
起始页码	33028
结束页码	33033
卷号	117 期号:52
英文摘要	Oxidized organic aerosol (OOA) is a major component of ambient particulate matter, substantially impacting climate, human health, and ecosystems. OOA is readily produced in the presence of sunlight, and requires days of photooxidation to reach the levels observed in the atmosphere. High concentrations of OOA are thus expected in the summer; however, our current mechanistic understanding fails to explain elevated OOA during wintertime periods of low photochemical activity that coincide with periods of intense biomass burning. As a result, atmospheric models underpredict OOA concentrations by a factor of 3 to 5. Here we show that fresh emissions from biomass burning exposed to NO2 and O3 (precursors to the NO3 radical) rapidly form OOA in the laboratory over a few hours and without any sunlight. The extent of oxidation is sensitive to relative humidity. The resulting OOA chemical composition is consistent with the observed OOA in field studies in major urban areas. Additionally, this dark chemical processing leads to significant enhancements in secondary nitrate aerosol, of which 50 to 60% is estimated to be organic. Simulations that include this understanding of dark chemical processing show that over 70% of organic aerosol from biomass burning is substantially influenced by dark oxidation. This rapid and extensive dark oxidation elevates the importance of nocturnal chemistry and biomass burning as a global source of OOA. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Air pollution; Biomass burning; Nighttime; Oxidation; Secondary organic aerosol
语种	英语
scopus关键词	nitrogen dioxide; oxygen; aerosol; air pollutant; air pollution; biomass; chemistry; city; oxidation reduction reaction; particulate matter; theoretical model; Aerosols; Air Pollutants; Air Pollution; Biomass; Cities; Models, Theoretical; Nitrogen Dioxide; Oxidation-Reduction; Oxygen; Particulate Matter
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179657
作者单位	Institute of Chemical Engineering Sciences, Foundation for Research and Technology-Hellas, Patras, 26504, Greece; Institute of Atmospheric Sciences and Climate, Italian National Research Council, Bologna, 40129, Italy; School of Architecture, Civil and Environmental Engineering, Swiss Federal Institute of Technology Lausanne, Lausanne, 1015, Switzerland; Department of Chemical Engineering, University of Patras, Patras, 26504, Greece
推荐引用方式 GB/T 7714	Kodros J.K.,Papanastasiou D.K.,Paglione M.,et al. Rapid dark aging of biomass burning as an overlooked source of oxidized organic aerosol[J],2021,117(52).
APA	Kodros J.K..,Papanastasiou D.K..,Paglione M..,Masiol M..,Squizzato S..,...&Pandis S.N..(2021).Rapid dark aging of biomass burning as an overlooked source of oxidized organic aerosol.Proceedings of the National Academy of Sciences of the United States of America,117(52).
MLA	Kodros J.K.,et al."Rapid dark aging of biomass burning as an overlooked source of oxidized organic aerosol".Proceedings of the National Academy of Sciences of the United States of America 117.52(2021).