Temperature effects on optical properties and chemical composition of secondary organic aerosol derived from n-dodecane

Temperature effects on optical properties and chemical composition of secondary organic aerosol derived from n-dodecane
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温度对正十二烷二次有机气溶胶光学性质和化学成分的影响

DOI:
10.5194/acp-2019-1218-supplement
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发表时间:
2020-02
影响因子:
6.3
通讯作者:
Ge Maofa
Ge Maofa
中科院分区:
地球科学1区
文献类型:
--
作者:
Li Junling;Wang Weigang;Li Kun;Zhang Wenyu;Peng Chao;Zhou Li;Shi Bo;Chen Yan;Liu Mingyuan;Li Hong;Ge Maofa

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抽象的。环境温度在控制导致化学变化的过程中起着至关重要的作用 二次有机气溶胶 (SOA) 的形成并最终影响其成分和光学 气溶胶颗粒的特性。在这项研究中,我们研究了 两种温度条件下的正十二烷 SOA:5 和 25 ∘C。结果表明,低温条件可以增强折射的实部 SOA 在 532 和 375 nm 波长处的指数 (RI)。质谱分析 研究表明,正十二烷 SOA 的分子组成会因温度而发生显着改变: 低温条件下形成大量低聚物,导致 RI 较高 价值观。这些发现将有助于提高我们对化学成分和光学的理解 SOA 在不同温度条件下的特性,并将提供一种可能的解释 冬季郊区能见度低。
Abstract. Environmental temperature plays a vital role in controlling chemical transformations that lead to the formation of secondary organic aerosol (SOA) and ultimately impact the composition and optical properties of the aerosol particles. In this study, we investigated optical properties of n-dodecane SOA under two temperature conditions: 5 and 25 ∘C. It was shown that low-temperature conditions could enhance the real part of the refractive index (RI) of the SOA at wavelengths of 532 and 375 nm. Mass spectrometry analysis revealed that the molecular composition of n-dodecane SOA was significantly modified by temperature: a large amount of oligomers were formed under low-temperature conditions, which led to higher RI values. These findings will help improve our understanding of the chemical composition and optical properties of SOA under different temperature conditions and will provide one possible explanation for the low visibility in suburban areas during winter.
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