AGS-PRF: Experimentally Determined Volatility of Secondary Organic Aerosol Formed Through Aqueous Oxidation

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项目编号	1624696
	AGS-PRF: Experimentally Determined Volatility of Secondary Organic Aerosol Formed Through Aqueous Oxidation
	Sarah Petters
主持机构	Petters Sarah S
项目开始年	2017
	2017-06-01
项目结束日期	2019-05-31
资助机构	US-NSF
项目类别	Fellowship
项目经费	86000(USD)
国家	美国
语种	英语
英文摘要	Secondary organic aerosols (SOA) are small particles produced by the oxidation of organic gases emitted by forests, fossil fuel combustion and fires. Complex chemical processes that are not well represented in climate models and are a source of large uncertainties in climate assessments produce sOAs. In particular the oxidation of organic gases by water in cloud drops is recognized to be important but there are limited studies to represent the processes that produce the particles and their properties. The proposed work will measure and quantify the persistence of these aqueous SOA particles by measuring their volatility in the laboratory and their inclusion in climate models will enable more robust assessments. In order to constrain aqueous SOA (aqSOA) production mechanism this research would experimentally quantify the volatility of aqSOA compounds that determine the low volatility fraction that survive evaporation and scavenging to effect global climate. The goal is to probe the fundamental relationship between the precursor molecular properties and aqSOA volatility. The laboratory studies will elucidate aqSOA-volatility relationships from (1) methylglyoxal, pyruvic acid, and methyl-vinyl ketone oxidation, (2) oxidation products in precipitation samples and (3) dried organic aerosol oxidation. The oxidation will be performed by hydroxyl radicals produced from hydrogen peroxide photolysis in a batch reactor, the mixtures will be aerosolized with a vibration orifice aerosol generator then evaporated in a flow tube and finally detected by an optical particle counter. Polarity-resolved volatility distributions will be measured using elution and ion chromatography. The results will elucidate the fundamental volatility properties of aqSOA to understand how they effect past, present and future climate.
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文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/71084
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Sarah Petters.AGS-PRF: Experimentally Determined Volatility of Secondary Organic Aerosol Formed Through Aqueous Oxidation.2017.