Collaborative Research: Fog Drop Reactions of Green Leaf Volatiles as a Source of Secondary Organic Aerosols

合作研究：绿叶挥发物作为二次有机气溶胶来源的雾滴反应

• 批准号: 1105049
• 负责人: Cort Anastasio
• 金额: $ 23.02万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-15 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1105049&HistoricalAwards=false
• 关键词: Collaborative; Research; Fog; Drop; Reactions

Green leaf volatiles (GLVs) are potentially significant but of unknown importance as a source of aqueous-phase secondary organic aerosol (SOA). GLVs are reactive, oxygenated, organic compounds that are emitted from plants in significant quantities and that can react both at the surface of fog drops and within the bulk of the drops. These aqueous reactions can occur via photochemically generated oxidants such as hydroxyl radical, singlet molecular oxygen, and excited triplet states of organic compounds. GLVs are also oxidized in the gas phase to make more water soluble products that could also participate in fog-drop reactions to form SOA. The hypothesis driving this research is that the uptake and photooxidation of GLVs and their first generation oxidation products can be a significant source of secondary organic carbon in fogwater. This hypothesis will be tested through four objectives: (1) Collect and chemically characterize fogwaters from Louisiana and California. (2) Measure GLV photooxidation, changes in organic composition, and the formation of SOA in illuminated fogwaters. (3) Quantify photooxidants in the illuminated fog waters and their reactivity with GLVs. (4) Integrate results from each objective in order to determine the mechanisms for GLV reactions in fogwaters and assess the significance of GLVs as an aqueous source of SOA.A post-doctoral scholar, a graduate student, and undergraduate students will be mentored during the project, including through an LSU-UCD undergraduate exchange research program. The results from the research will be integrated into undergraduate and graduate teaching at both institutions. And, because fog events can affect the concentrations of regulated pollutants, especially PM2.5, in both Louisiana and California, results from this work will inform state air quality policy agencies.

绿叶挥发物 (GLV) 作为水相二次有机气溶胶 (SOA) 的来源具有潜在的重要意义，但重要性未知。 GLV 是活性含氧有机化合物，从植物中大量排放，可以在雾滴表面和雾滴主体内部发生反应。这些水相反应可以通过光化学产生的氧化剂（例如羟基自由基、单线态分子氧和有机化合物的激发三线态）发生。 GLV 也会在气相中被氧化，产生更多的水溶性产物，这些产物也可以参与雾滴反应形成 SOA。推动这项研究的假设是，GLV 及其第一代氧化产物的吸收和光氧化可能是雾水中次生有机碳的重要来源。该假设将通过四个目标进行检验：（1）收集路易斯安那州和加利福尼亚州的雾水并对其进行化学表征。 (2) 测量光照雾水中的 GLV 光氧化、有机成分的变化以及 SOA 的形成。 (3) 量化照明雾水中的光氧化剂及其与 GLV 的反应性。 (4) 整合每个目标的结果，以确定雾水中 GLV 反应的机制，并评估 GLV 作为 SOA 水源的重要性。博士后学者、研究生和本科生将在研究期间接受指导项目，包括通过路易斯安那州立大学-都柏林大学本科生交换研究计划。研究结果将纳入两个机构的本科生和研究生教学中。而且，由于雾事件会影响路易斯安那州和加利福尼亚州受管制污染物的浓度，尤其是 PM2.5，因此这项工作的结果将为州空气质量政策机构提供信息。

项目成果

Aqueous reactions of organic triplet excited states with atmospheric alkenes

有机三重激发态与大气烯烃的水相反应

• DOI: 10.5194/acp-19-5021-2019
• 发表时间: 2018-12-04
• 期刊: Atmospheric Chemistry and Physics
• 影响因子: 6.3
• 作者: R. Kaur;B. M. Hudson;Joseph Draper;D. Tantillo;C. Anastasio
• 通讯作者: C. Anastasio

First Measurements of Organic Triplet Excited States in Atmospheric Waters

大气水中有机三重激发态的首次测量

• DOI: 10.1021/acs.est.7b06699
• 发表时间: 2018-05
• 期刊: Environmental Science & Technology
• 影响因子: 11.4
• 作者: Kaur, Richie;Anastasio, Cort
• 通讯作者: Anastasio, Cort