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; 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.

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.氮氧化物（NOX）是确定次要污染物（例如臭氧和二次气溶胶）的重要大气污染物，这可能会对人类健康，生态系统和气候产生不利影响。在被污染的空气中，平底锅形成是NOX最重要的临时储层。 PAN可以在冷空气中短而长的距离，当温度变暖时，它会分解为改革NO2和酰基经验激素，从而在全球范围内影响NOX预算。该项目旨在开发一种新的方法，以从各种来源和化学途径中从各种来源和化学途径中硝酸盐（PAN），并提高对大气中PAN预算的理解及其对空气质量和气候的影响。该项目还将支持研究生和本科生研究人员，并帮助建立在分析和环境化学领域工作所需的核心技能。该项目的结果将纳入三所大学的几个环境科学课程中，以及在当地社区中的K-8教育。一种升级的PAN生成系统和气相色谱技术将与一种新方法一起在实验室中浓缩PAN，以测量PAN的同位素组成，以pAN的同位素组成，侧重于氧气和氮和氮素。事实证明，大气中反应性氮种类的同位素分析可为来源分配和化学途径提供新的见解。此外，还将研究PAN对PIS开发的同位素分析的当前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。该项目有可能为更好地量化大气中的反应性氮预算做出重大贡献，并为建立改进的现场就绪技术以在环境中的未来应用而做出改进的现场就绪技术。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的评估来通过评估来提供支持的。