Collaborative Research: Laboratory Studies of the Role of Organic Peroxy Radicals (RO2) Chemistry on the Evolution of Atmospheric Organic Carbon

合作研究：有机过氧自由基（RO2）化学对大气有机碳演化作用的实验室研究

• 批准号: 2129833
• 负责人: Manjula Canagaratna
• 金额: $ 22.49万
• 依托单位: Aerodyne Research Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-12-01 至 2024-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2129833&HistoricalAwards=false
• 关键词: Collaborative; Research; Laboratory; Studies; Role

The goal of this project is to improve knowledge about reactive chemistry and the atmospheric oxidation of organic compounds. A suite of instruments will be used in the laboratory to develop a more complete understanding of how certain chemical regimes control the amount, identity, and properties of gas-phase and aerosol products during atmospheric oxidation. This project will yield new insights into the chemistry underlying the formation of atmospheric organic aerosol, an important component influencing air quality and global climate.This project is focused on peroxy radical (RO2) chemistry and how it controls the distribution of reaction products formed during the atmospheric oxidation of organic compounds. Volatile organic compounds will be oxidized in an environmental chamber under carefully-controlled RO2 reaction conditions, and the formation and evolution of the resulting products will be measured using a suite of real-time time-of-flight mass spectrometric techniques to provide information on the concentration, chemical formula, oxidation state, and volatility of organic species. Key outputs include comprehensive measurements of gas- and particle-phase products, volatility distributions (including secondary organic aerosol yields), and evolving OH reactivities. Finally, measurements of key ensemble properties of the reaction mixture (e.g., carbon oxidation state, carbon number) will be compared against predictions from state-of-the-art atmospheric chemical mechanisms. Results from this project can be used in 3D models, and time-dependent concentrations will be made publicly available as a community resource for testing and refining state-of-the-art models of atmospheric oxidation and the formation of secondary organic aerosol. This project includes training for early-career scientists, including both graduate and undergraduate students.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目的目的是提高有关反应性化学和有机化合物大气氧化的知识。实验室将使用一套仪器来对某些化学状态如何控制大气氧化过程中气相和气溶胶产物的数量，身份和性质的更全面了解。该项目将产生对大气有机气溶胶形成的化学的新见解，这是影响空气质量和全球气候的重要组成部分。该项目侧重于过氧自由基（RO2）化学以及它如何控制有机化合物大气氧化过程中形成的反应产物的分布。挥发性有机化合物将在经过精心控制的RO2反应条件下在环境室中氧化，并将使用一套实时飞行时间的质谱技术来测量所得产物的形成和演化，以提供有关浓度，化学式，化学式，氧化状态，氧化状态以及有机物的波动性的信息。关键输出包括对气体和粒子相产品的全面测量，挥发性分布（包括二级有机气溶胶产量）以及不断发展的OH反应率。最后，将比较反应混合物的关键集成特性（例如，碳氧化态，碳数）与最先进的大气化学机制的预测进行比较。该项目的结果可用于3D模型，并将依赖时间的浓度作为社区资源公开提供，用于测试和完善大气氧化的最先进模型和二级有机气溶胶的形成。该项目包括对早期职业科学家的培训，包括研究生和本科生。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响评估标准，被认为值得通过评估来获得支持。