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: 2131458
• 负责人: Pengfei Liu
• 金额: $ 33.44万
• 依托单位: Georgia Tech Research Corporation
• 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=2131458&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.

该项目是一项合作的努力，旨在开发一种新工具来研究氮在大气中夜间化学中的作用。将建立一个可田间脱氧化的氧化流动反应器（OFR），以提供对硝酸盐自由基（NO3）引发的大气氧化衰老过程的新见解。实验将在环境室和OFRS中进行，以区分羟基（OH）和硝酸盐自由基对形成氧化挥发性有机化合物（OVOC）和二级有机气溶胶（SOA）的相对贡献。 这些物种可能会对天气，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）从voc + No3反应中产生ovocs和soa在多大程度上可以在多大程度上产生问题？ （2）是由可用于在大气中追踪这些过程的顺序多日氧化老化过程形成的独特氧化产物吗？ （3）环境空气暴露于NO3与OH自由基在OFR中的OVOC和SOA形成潜力是什么？它如何随着综合氧化剂暴露和源区域的函数而变化？ （4）环境空气的NO3扰动能否在夜间NO3和O3化学之间进行更清晰的描述，尤其是在识别含有非氮的NO3 NO3氧化产品方面？该项目支持几位研究生和早期职业研究员。这项奖项反映了NSF的法定任务，并反映了通过评估的范围来弥补的范围。