AGS-PRF: A Global Survey of Atmospheric Hydroperoxides: HOx Cycling, Tropospheric Ozone and Chemistry-Climate Interactions

该项目支持美国国家科学基金会的博士后研究员研究生物来源的异戊二烯排放的大气化学。异戊二烯可以由陆地生态系统产生，在大气中可能会发生不同的反应，这取决于存在的其他气体和气溶胶。氮氧化物浓度可以影响异戊二烯对大气中臭氧或非常小的有机颗粒形成的贡献程度。本研究研究了低浓度氮氧化物(NOx)条件下的异戊二烯氧化过程，以及异戊二烯氧化产物对臭氧和二次有机气溶胶(SOA)形成的影响。重点放在过氧化氢的形成、破坏和物理吸收过程上。这项研究有望解决有关过氧化氢沉积速率及其对过氧化氢自由基(HOX)预算的影响的长期问题，并导致基于现场数据的新的参数化。将通过检查各种环境条件下每个氧化反应的源和汇来研究异戊二烯对SOA形成的贡献。将部署一种新的仪器来分离异戊二烯氧化产物，以检查每种氧化产物的不同化学命运。

This project supports an NSF Postdoctoral Research Fellow to investigate the atmospheric chemistry of biogenic isoprene emissions. Isoprene can be produced by terrestrial ecosystems and can react differently in the atmosphere depending on what other gases and aerosols are present. Nitrogen oxide concentrations can influence the extent to which isoprene contributes to the formation of ozone or very small organic particles in the atmosphere.This research investigates isoprene oxidation processes in conditions with low concentrations of nitrogen oxides (NOx), and the effects of isoprene oxidation products on ozone and the formation of secondary organic aerosol (SOA). The focus is on the formation, destruction and physical uptake processes of hydroperoxides. The research is expected to address long-standing questions about hydrogen peroxide deposition rates and its impact on the budget of hydrogen oxide radicals (HOx), and lead to new parameterizations based on in-situ data. The contribution of isoprene to SOA formation will be investigated by examining the sources and sinks of each oxidation reaction across a wide variety of environmental conditions. A novel instrument will be deployed for the separation of isoprene oxidation products to examine the different chemical fates of each.