Multicomponent new particle formation from sulfuric acid, ammonia, and biogenic vapors
Multicomponent new particle formation from sulfuric acid, ammonia, and biogenic vapors
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DOI：
10.1126/sciadv.aau5363
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发表时间：
2018-12-01
期刊：
影响因子：
13.6
通讯作者：
Worsnop, Douglas R.
中科院分区：
文献类型：
--
作者：
Lehtipalo, Katrianne;Yan, Chao;Worsnop, Douglas R.
影响空气质量和气候的大气气溶胶粒子的主要部分是由大气中的气态前体形成的。已知由生物源挥发性有机化合物氧化形成的高度氧化的有机分子（HOM）参与颗粒形成和生长。然而，人们还不清楚它们如何与大气污染物相互作用，如化石燃料燃烧产生的氮氧化物（NOx）和硫氧化物（SOx），以及牲畜和肥料产生的氨（NH3）。在这里，我们展示了NOx如何抑制颗粒形成，而HOMs，硫酸和NH3对颗粒形成具有协同增强作用。我们假设一种新的机制，涉及HOMs，硫酸和氨，这是能够密切再现观测颗粒的形成和生长在白天的北方森林和类似的环境。这些发现阐明了大气气溶胶系统中生物和人为蒸汽之间复杂的相互作用。
A major fraction of atmospheric aerosol particles, which affect both air quality and climate, form from gaseous precursors in the atmosphere. Highly oxygenated organic molecules (HOMs), formed by oxidation of biogenic volatile organic compounds, are known to participate in particle formation and growth. However, it is not well understood how they interact with atmospheric pollutants, such as nitrogen oxides (NOx) and sulfur oxides (SOx) from fossil fuel combustion, as well as ammonia (NH3) from livestock and fertilizers. Here, we show how NOx suppresses particle formation, while HOMs, sulfuric acid, and NH3 have a synergistic enhancing effect on particle formation. We postulate a novel mechanism, involving HOMs, sulfuric acid, and ammonia, which is able to closely reproduce observations of particle formation and growth in daytime boreal forest and similar environments. The findings elucidate the complex interactions between biogenic and anthropogenic vapors in the atmospheric aerosol system.