Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2010365117 |
Rapid dark aging of biomass burning as an overlooked source of oxidized organic aerosol | |
John K. Kodros; Dimitrios K. Papanastasiou; Marco Paglione; Mauro Masiol; Stefania Squizzato; Kalliopi Florou; Ksakousti Skyllakou; Christos Kaltsonoudis; Athanasios Nenes; Spyros N. Pandis | |
2020-12-14 | |
发表期刊 | Proceedings of the National Academy of Science |
出版年 | 2020 |
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. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/308267 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | John K. Kodros,Dimitrios K. Papanastasiou,Marco Paglione,et al. Rapid dark aging of biomass burning as an overlooked source of oxidized organic aerosol[J]. Proceedings of the National Academy of Science,2020. |
APA | John K. Kodros.,Dimitrios K. Papanastasiou.,Marco Paglione.,Mauro Masiol.,Stefania Squizzato.,...&Spyros N. Pandis.(2020).Rapid dark aging of biomass burning as an overlooked source of oxidized organic aerosol.Proceedings of the National Academy of Science. |
MLA | John K. Kodros,et al."Rapid dark aging of biomass burning as an overlooked source of oxidized organic aerosol".Proceedings of the National Academy of Science (2020). |
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