Collaborative Research: Characterizing Isotopic Composition as a Tracer of Atmospheric Peroxyacetyl Nitrate (PAN) Sources and Chemistry

合作研究：表征同位素组成作为大气过氧乙酰硝酸盐 (PAN) 来源和化学的示踪剂

• 批准号: 2305091
• 负责人: Emily Fischer
• 金额: $ 17.87万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-15 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2305091&HistoricalAwards=false
• 关键词: Collaborative; Research; Characterizing; Isotopic; Composition

With support from the Environmental Chemical Sciences Program in the Division of Chemistry, Jiajue Chai at the State University of New York - College of Environmental Science and Forestry (SUNY ESF), Meredith Hastings at Brown University, and Emily Fischer at Colorado State University along with students, postdocs and research scientists will investigate peroxyacetyl nitrate (PAN), an important secondary air pollutant. Nitrogen oxides (NOx) are key atmospheric pollutants that determine formation of secondary pollutants such as ozone and secondary aerosols, which can have an adverse impact on human health, ecosystems and climate. In polluted air, PANs form as the most important temporary reservoirs for NOx. PAN can be transported short and long distances in cold air masses, and when the temperature warms, it decomposes to reform NO2 and an acylperoxy radical, for example, thus influencing NOx budgets on a global scale. This project aims to develop a new method to fingerprint peroxyacetyl nitrate (PAN) from various sources and chemistry pathways and to improve the understanding of PAN budget in the atmosphere and its influence on air quality and climate. This project will also support graduate and undergraduate student researchers and help to build their core skills necessary for work in the fields of analytical and environmental chemistry. Results from this project will be incorporated into several environmental science courses across the three universities, as well as K-8 education in local communities.An upgraded PAN generation system and gas chromatography technique will be used with a new method for concentrating PAN in the laboratory for the purpose of measuring the isotopic composition of PAN with a particular focus on oxygen and nitrogen isotopes. The isotopic analysis of reactive nitrogen species in the atmosphere has proven to give new insights into source apportionment and chemical pathways. Additionally, interference of PAN with current NOx and NO2 collection techniques for isotopic analysis developed by the PIs will also be investigated to better quantify these tracers in the atmosphere. This project has the potential to make a significant contribution toward better quantification of the reactive nitrogen budget in the atmosphere and toward the establishment of improved field-ready techniques for future application in the environment.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.

在化学系环境化学科学项目的支持下，纽约州立大学环境科学与林业学院 (SUNY ESF) 的 Jiajue Chai、布朗大学的 Meredith Hastings 和科罗拉多州立大学的 Emily Fischer 以及学生、博士后和研究科学家将研究过氧乙酰硝酸盐（PAN），一种重要的二次空气污染物。氮氧化物 (NOx) 是主要的大气污染物，决定着臭氧和二次气溶胶等二次污染物的形成，对人类健康、生态系统和气候产生不利影响。在污染空气中，PAN 是氮氧化物最重要的临时储存库。 PAN 可以在冷气团中短距离和长距离运输，当温度升高时，它会分解，重新形成 NO2 和酰基过氧自由基，从而影响全球范围内的 NOx 预算。该项目旨在开发一种新方法，从各种来源和化学途径中对过氧乙酰硝酸盐（PAN）进行指纹识别，并提高对大气中 PAN 预算及其对空气质量和气候影响的了解。该项目还将支持研究生和本科生研究人员，并帮助他们培养分析和环境化学领域工作所需的核心技能。该项目的成果将被纳入三所大学的几门环境科学课程以及当地社区的 K-8 教育中。升级的 PAN 生成系统和气相色谱技术将与实验室中浓缩 PAN 的新方法一起使用目的是测量 PAN 的同位素组成，特别关注氧和氮同位素。事实证明，大气中活性氮的同位素分析可以为源解析和化学途径提供新的见解。此外，还将研究 PAN 对 PI 开发的用于同位素分析的当前 NOx 和 NO2 收集技术的干扰，以更好地量化大气中的这些示踪剂。该项目有潜力为更好地量化大气中的活性氮预算以及为未来在环境中的应用建立改进的现场就绪技术做出重大贡献。该奖项反映了 NSF 的法定使命，并被认为是值得的通过使用基金会的智力优势和更广泛的影响审查标准进行评估来提供支持。