The Chemistry of Oxidation Flow Reactors (OFR) and the Sources of Semivolatile and Intermediate Volatility Secondary Organic Aerosol (SOA) Precursors in Recent NSF Field Studies

该项目将为氧化流反应器（OFR）在大气化学研究中的应用提供信息。OFR用于研究大气中二次有机气溶胶（SOA）的形成。使用OFR的实验和模型研究将有助于确定它们对理解大气中的化学反应的代表性。这一努力解决了两个研究问题：(1)与大气和大型环境室相比，OFR化学的代表性是什么，如何进行优化？(2)生物源环境下环境空气OH氧化的关键SOA前体是什么？该项目包括建模和实验室研究，以模拟最近nsf支持的实地活动的观测测量。这项研究将提供大气科学界正在迅速采用的OFR技术的有用性、解释和最佳实践方面急需的信息。这项工作还将有助于对控制SOA形成的关键前体、途径和人为-生物相互作用施加更严格的约束。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 will inform the use of Oxidation Flow Reactors (OFR) in the study of atmospheric chemistry. OFR are used to study the formation of secondary organic aerosol (SOA) in the atmosphere. Experimental and modeling investigations of the use of the OFR will help to determine their representativeness to understanding chemical reactions in the atmosphere.This effort addresses two research questions: (1) What is the representativeness of OFR chemistry compared to the atmosphere and large environmental chambers, and how can it be optimized? (2) What are the key SOA precursors for OH oxidation of ambient air in biogenic environments? The project includes modeling and laboratory studies to simulate observational measurements from recent NSF-supported field campaigns. This research will provide critically-needed information on the usefulness, interpretation, and best practices of the OFR technique that is being adopted rapidly by the atmospheric science community. This effort also will help place firmer constraints on the key precursors, pathways and anthropogenic-biogenic interactions controlling SOA formation.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.