Aerosol Chemistry of Complex Plant Volatile Systems

该项目旨在提供与复杂植物排放有关的大气化学的新机制理解，这些排放有助于大气中二次有机气溶胶（SOA）的产生。目前，大多数区域或全球气溶胶模式尚未考虑植物生物源性挥发性有机化合物（BVOC）排放的复杂混合物。这项研究将有助于描述以前没有研究过的SOA前体的化学行为，包括混合物的重要影响。本研究的目标是研究植物排放中一系列化学复杂性的关键差距，包括：(1)单组分，低复杂性实验室实验，重点关注植物通常排放的无环萜烯和含氧单萜烯，但在SOA文献中代表性不足；(2)由合成标准制成的复杂挥发性混合物（中等复杂性）；(3)实际植物排放（最高复杂性）。实验室SOA将通过氧化流反应器（OFR）中的光氧化或臭氧分解生成。将为每个VOC系统生成至少四个主要数据产品，以表征SOA化学：SOA质量产率曲线、SOA氧化剂暴露曲线、Kroll图和挥发性分布。该奖项反映了美国国家科学基金会的法定使命，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。

This project seeks to provide new mechanistic understanding of atmospheric chemistry associated with complex plant emissions that contribute to the production of secondary organic aerosol (SOA) in the atmosphere. Complex mixtures of plant biogenic volatile organic compound (BVOC) emissions are not currently accounted for in most regional or global aerosol models. This research will help to characterize the chemical behavior of SOA precursors that have not been studied previously, including the important effects of mixtures.The goal of this research is to study critical gaps across a range of chemical complexities in plant emissions that include: (1) single component, low complexity laboratory experiments that focus on acyclic terpenes and oxygenated monoterpenes that are commonly emitted by plants but are underrepresented in the SOA literature, (2) complex volatile mixtures made from synthetic standards (intermediate complexity), and (3) actual plant emissions (highest complexity). Laboratory SOA will be generated via photooxidation or ozonolysis in an oxidation flow reactor (OFR). At least four major data products will be generated for each VOC system to characterize the SOA chemistry: SOA mass yield curves, SOA oxidant exposure curves, Kroll diagrams, and volatility distributions.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.