Collaborative Research: A Nitrate Radical Oxidation Flow Reactor: Development and Use in Laboratory and Field Studies

合作研究：硝酸根氧化流动反应器：实验室和现场研究的开发和使用

• 批准号: 2131084
• 负责人: Drew Gentner
• 金额: $ 12.61万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-02-15 至 2025-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2131084&HistoricalAwards=false
• 关键词: Collaborative; Research; Nitrate; Radical; Oxidation

This project is a collaborative effort to develop a new tool to study of the role of nitrogen in nighttime chemistry in the atmosphere. A field-deployable Oxidation Flow Reactor (OFR) will be built to provide new insights into nitrate radical (NO3)-initiated atmospheric oxidative aging processes. Experiments will be conducted in both environmental chambers and OFRs to distinguish the relative contributions of hydroxyl (OH) and nitrate radicals to the formation of oxidized volatile organic compounds (OVOCs) and secondary organic aerosol (SOA). These species can have widespread impacts on weather, climate, and human health.This effort addresses the following questions: (1) To what extent can OFRs reproducibly generate OVOCs and SOA from VOC + NO3 reactions? (2) Are unique oxidation products formed from sequential multi-day oxidative aging processes that can be used to trace these processes in the atmosphere? (3) What is the OVOC and SOA formation potential of ambient air exposed to NO3 versus OH radicals in an OFR, and how does it change as a function of integrated oxidant exposure and source region? (4) Can NO3-OFR perturbations of ambient air enable clearer delineation between nighttime NO3 and O3 chemistry, especially with respect to identifying non-nitrogen-containing NO3 oxidation products?This project supports several graduate students and an early career researcher.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.

该项目是一项合作努力，旨在开发一种新的工具来研究氮在夜间大气化学中的作用。将建造一个可现场部署的氧化流动反应器（OFR），以提供对硝酸根（NO3）引发的大气氧化老化过程的新见解。实验将在环境室和OFR中进行，以区分羟基（OH）和硝酸根对氧化挥发性有机化合物（OVOCs）和二次有机气溶胶（SOA）形成的相对贡献。 这些物种可以对天气、气候和人类健康产生广泛的影响。这项工作解决了以下问题：（1）OFR在多大程度上可以重复地从VOC + NO3反应中产生OVOCs和SOA？(2)连续多日的氧化老化过程是否形成了独特的氧化产物，可用于追踪大气中的这些过程？(3)什么是OVOC和SOA的形成潜力的环境空气暴露于NO3与OH自由基在OFR，它是如何改变的功能，作为一个综合氧化剂暴露和源区？(4)环境空气的NO3-OFR扰动是否能够更清楚地区分夜间NO3和O3化学，特别是在识别不含氮的NO3氧化产物方面？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。