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

AGS-PRF：大气氢过氧化物的全球调查：HOx 循环、对流层臭氧和化学与气候相互作用

• 批准号: 1524860
• 负责人: Michelle Kim
• 金额: $ 8.6万
• 依托单位: Kim Michelle J
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2017-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1524860&HistoricalAwards=false
• 关键词: AGS; PRF; Global; Survey; Atmospheric

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.

该项目支持一名美国国家科学基金会博士后研究人员研究生物源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，并根据大气中存在的其他气体和气溶胶的不同而发生不同的反应。氮氧化物浓度可以影响异戊二烯在多大程度上促成臭氧或大气中非常小的有机颗粒的形成。本研究研究了低浓度氮氧化物（NOx）条件下异戊二烯氧化过程，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。重点是氢过氧化物的形成、破坏和物理吸收过程。该研究有望解决关于过氧化氢沉积速率及其对氧化氢自由基（HOx）预算的影响的长期问题，并基于原位数据产生新的参数化。通过检查各种环境条件下每种氧化反应的源和汇，将研究异戊二烯对SOA形成的贡献。一种新型仪器将用于分离异戊二烯氧化产物，以检查每种产物的不同化学命运。