相对湿度和种子颗粒对α-蒎烯二次有机气溶胶分子组成的影响

Jens Top, Natasha M. Garner, Félix Sari Doré, Yanjun Zhang, Cecilie Carstens, Clément Dubois, Fabian Mahrt, Markus Ammann, André S. H. Prévôt, Matthieu Riva, Imad El Haddad and David M. Bell*, 
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引用次数: 0

摘要

二次有机气溶胶(SOA)是亚微米粒子的主要组成部分,对气候和人类健康至关重要。SOA可以通过低挥发性有机化合物的成核,在大气氧化后形成,或者通过将这些蒸汽压缩到现有的颗粒上形成。在这两种情况下,SOA颗粒的形成都可能受到大气条件(例如,相对湿度(RH))和颗粒液态水含量的影响。本研究考察了RH对暗α-蒎烯(C10H16)臭氧分解中SOA形成和组成的影响,作为一个典型的体系,在不同RH水平下,有或没有硫酸铵(as, (NH4)2SO4)种子颗粒。利用在线萃取电喷雾电离质谱法,我们以高化学和时间分辨率鉴定了SOA中的单体(C7-10)和二聚体(C15-20)。在这两种情况下,高RH (>90%)促进了二聚体在颗粒阶段的形成,而它们在实验开始时(NH4)2SO4种子存在时出现。二聚体在高RH含种子实验(60-65%二聚体)中迅速增加,而在低RH(10%)中不存在,这表明颗粒内反应是二聚体形成的原因。水和硫酸铵种子颗粒的存在都会影响暗臭氧分解形成的α-蒎烯二次有机气溶胶中凝聚相产物的组成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of Relative Humidity and Seed Particles on Molecular Composition of α-Pinene Secondary Organic Aerosol

Secondary organic aerosol (SOA), a major component of submicrometer particles, is critical to the climate and human health. SOA can form through nucleation of low-volatility organic compounds, following atmospheric oxidation, or by condensing these vapors onto existing particles. In either of these cases, the formation of SOA particles could be affected by atmospheric conditions (e.g., relative humidity (RH)) and particle liquid water content. This study examines the effects of RH on the formation and composition of SOA from dark α-pinene (C10H16) ozonolysis, as a canonical system, with or without ammonium sulfate (AS, (NH4)2SO4) seed particles across varying RH levels. Using online extractive electrospray ionization mass spectrometry, we identified monomers (C7–10) and dimers (C15–20) in the SOA with high chemical and temporal resolution. In both cases, high RH (>90%) promotes dimer formation in the particle phase, while they appear at the beginning of the experiment when (NH4)2SO4 seeds are present. The prompt increase in dimers in high RH seed containing experiments (60–65% dimers), which are absent at low RH (10%), suggests that intraparticle reactions are responsible for the dimer formation.

Both water and the presence of ammonium sulfate seed particles impact the composition of condensed-phase products in α-pinene secondary organic aerosol formed via dark ozonolysis.

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