Early-Generation Photochemical Oxidation Products of Isoprene Under Low-NO Conditions:Aerosol Formation Potential and Structural Assignments by Ion Mobility Mass Spectral Analysis

该项目的研究人员将进行实验室和理论研究，以促进我们对异戊二烯的大气化学的理解，异戊二烯由植物排放，可导致大气臭氧和气溶胶的形成。这项工作旨在专门研究导致异戊二烯形成二次气溶胶的途径，以改进大气化学模型，使我们能够更好地解决紧迫的空气质量问题。这项研究将扩大我们对大气化学的理解，并培养新的本科生和研究生。研究小组试图确定尚未验证的异戊二烯早期氧化产物的结构，随后形成的二次有机气溶胶化合物，并描述这些氧化产物及其最终的化学命运。为了应对这些挑战，该项目组确定了三个具体的研究目标：（1）完善异戊二烯二次有机气溶胶分析协议;（2）表征再挥发多相化学产品的气相氧化产物;（3）确认这些早期气相氧化产物及其二次有机气溶胶形成潜力。这项工作将支持和培训本科生和研究生，并可能推进大气化学和气候模型，这些模型随后可用于为污染控制战略和空气质量政策提供信息。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

The investigators in this project will conduct laboratory and theoretical research to advance our understanding of the atmospheric chemistry of isoprene, which is emitted by plants and can lead to the formation of atmospheric ozone and aerosol. This work seeks to specifically study the pathways that cause isoprene to form secondary aerosol in order to improve atmospheric chemistry models and allow us to better address pressing air quality issues. The research will expand our understanding of atmospheric chemistry and train new undergraduate and graduate students.The research team seeks to determine the structure of yet-to-be verified early-generation oxidation products of isoprene, the secondary organic aerosol compounds that subsequently form, and to characterize these oxidation products and their ultimate chemical fate. To address these challenges, this project team has identified three specific research aims: (1) the refinement of protocols for the analysis of isoprene secondary organic aerosols; (2) the characterization of gas-phase oxidation products of re-volatilized multiphase chemical products; and (3) the confirmation of these early-generation gas-phase oxidation products and their secondary organic aerosol forming potentials. This work will support and train undergraduate and graduate students and could potentially advance atmospheric chemistry and climate models, which could subsequently be used to inform pollution control strategies and air quality policies.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.