Atmospheric Lifecycle of Highly Oxygenated Multifunctional Compounds

高含氧多功能化合物的大气生命周期

• 批准号: 2131199
• 负责人: Xuan Zhang
• 金额: $ 48.84万
• 依托单位: University of California - Merced
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-08-15 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2131199&HistoricalAwards=false
• 关键词: Atmospheric; Lifecycle; Highly; Oxygenated; Multifunctional

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2). This project is focused on investigations of the multiphase dynamics and chemistry of highly oxygenated multifunctional compounds (HOMs) in the atmosphere and will provide a key missing piece in the current understanding of the atmospheric lifecycle of HOMs, their identities, abundance, and reactive chemistry. The results of this research will aid in predictions of how the reactive chemistry of HOMs modifies the atmospheric composition and will provide crucial information needed for the accurate simulation of fine particles and their interactions with clouds in the atmosphere. It will also produce a dataset useful for understanding the toxicity of HOMs and their impact on human health.The main objectives of this project are to: (1) Characterize the molecular signature and abundance of HOMs in organic aerosols from both biogenic and anthropogenic sources; (2) Examine how the composition and distribution of HOMs respond to varying nitrogen oxides (NOx) levels; and (3) Quantify the lifetimes of HOMs upon gas-particle conversion and elucidate the aging and removal pathways that HOMs undergo in the particle phase. The results will be applied to address the following scientific questions: (a) What are the molecular forms by which HOMs are present in the particle phase and the linkage with the HOMs identified in the gas phase? (b) How long could HOMs survive upon gas-particle conversion? (c) What are the aging pathways HOMs undergo in the particle phase? (d) To what extent does the HOMs aging affect the yield and makeup of the SOA produced? and (e) How will the particulate HOMs respond to reducing anthropogenic NOx emissions?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.

该奖项是根据2021年《美国救援计划法》（公法117-2）全部或部分资助的。 该项目的重点是研究大气中高度氧化的多功能化合物（HOMS）的多相动力学和化学，并将在当前对霍姆斯大气生命周期，其身份，丰度和反应性化学的理解中提供关键的缺失。这项研究的结果将有助于预测HOM的反应性化学如何修饰大气组成，并提供精确模拟细颗粒及其与大气中云的相互作用所需的关键信息。它还将产生一个有用的数据集，可用于了解HOM的毒性及其对人类健康的影响。该项目的主要目标是：（1）表征来自生物和人为来源的有机气溶胶中HOMS的分子特征和丰度； （2）检查HOM的组成和分布如何响应不同的氮氧化物（NOX）水平； （3）量化燃气粒子转化后HOM的寿命，并阐明颗粒相中homs经历的老化和去除途径。结果将应用于解决以下科学问题：（a）在粒子相中存在HOM的分子形式以及与气相中确定的HOM的链接的分子形式是什么？ （b）在燃气粒子转化后，霍姆斯可以生存多长时间？ （c）在粒子相中，老化的途径霍姆斯发生了什么？ （d）霍姆斯老化在多大程度上影响产生的SOA的产量和构成？ （e）颗粒物对减少人为NOx的排放将如何反应？该奖项反映了NSF的法定任务，并认为使用基金会的知识分子优点和更广泛的影响审查标准，被认为值得通过评估来提供支持。

项目成果

Probing isoprene photochemistry at atmospherically relevant nitric oxide levels

在大气相关一氧化氮水平下探测异戊二烯光化学

• DOI: 10.1016/j.chempr.2022.08.003
• 发表时间: 2022
• 期刊: Chem
• 影响因子: 23.5
• 作者: Zhang, Xuan;Wang, Siyuan;Apel, Eric C.;Schwantes, Rebecca H.;Hornbrook, Rebecca S.;Hills, Alan J.;DeMarsh, Kate E.;Moo, Zeyi;Ortega, John;Brune, William H.
• 通讯作者: Brune, William H.