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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

基本信息

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

项目摘要

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.

绿色叶挥发物（GLV）作为水相二次有机气溶胶（SOA）的来源具有潜在的重要性，但其重要性尚不清楚。GLV是一种活性的、含氧的有机化合物，从植物中大量排放，可以在雾滴表面和雾滴内部发生反应。这些水性反应可以通过光化学产生的氧化剂如羟基自由基、单线态分子氧和有机化合物的激发三重态发生。GLV也在气相中被氧化以产生更多的水溶性产物，这些产物也可以参与雾滴反应以形成SOA。驱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以是雾水中次生有机碳的重要来源。这一假设将通过四个目标进行测试：（1）收集和化学表征来自路易斯安那州和加州的雾水。(2)测量GLV光氧化，有机成分的变化，以及在照明的雾水中SOA的形成。(3)量化照明雾沃茨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GLV反应的机制在fogwaters和评估glv作为soa的水源的意义。博士后学者，研究生和本科生将在项目期间得到指导，包括通过LSU-UCD本科生交流研究计划。研究结果将被整合到这两个机构的本科和研究生教学中。而且，由于雾事件会影响路易斯安那州和加州受管制污染物的浓度，特别是PM2.5，这项工作的结果将告知州空气质量政策机构。