Field and Laboratory Study of Rural Volatile Organic Compounds (VOCs) Oxidation and Secondary Organic Aerosol (SOA) Formation Utilizing Measurements of Formaldehyde and Glyoxal

利用甲醛和乙二醛的测量对农村挥发性有机化合物 (VOC) 氧化和二次有机气溶胶 (SOA) 形成进行现场和实验室研究

• 批准号: 1247421
• 负责人: Frank Keutsch
• 金额: $ 34.78万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-04-01 至 2016-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1247421&HistoricalAwards=false
• 关键词: Field; Laboratory; Study; Rural; Volatile

Aerosol and ozone (O3) affect human health, the environment, and climate. Oxidation of volatile organic compounds (VOCs), in particular via the hydroxyl radical (OH), is directly coupled to the formation of O3 and it contributes to secondary organic aerosol (SOA), an important component of ambient aerosol. As part of the Southern Oxidant and Aerosol Study (SOAS) the principal investigators (PIs) planned comprehensive laboratory and field studies focused on improving the detailed mechanistic understanding of the processes controlling OH and isoprene, the most important VOC, especially in rural environments. A goal is to specifically study the anthropogenic impact on biogenic VOC (BVOC) oxidation and resulting SOA formation. The project addresses the following questions: 1) How well do current mechanisms represent VOC oxidation, especially for isoprene, and in particular under low-NO conditions? 2) How well do current mechanisms/models represent OH photochemistry in view of recent findings of potential measurement interferences? 3) What are the dominant mechanisms of anthropogenic influence on rural VOC oxidation and resulting O3 and SOA formation? This research is designed to contribute ultimately to improved prediction of secondary pollutant effects from precursor emissions, and an improved ability to mitigate the anthropogenic effects of emissions on climate, human health, and the environment. The PIs also will develop a Library of Organic Standards for Atmospheric Chemistry (OSAC) that will be a publicly available online database aimed at enabling improved access to starting materials for laboratory studies and standards for calibrations.

气溶胶和臭氧（O3）影响人类健康，环境和气候。挥发性有机化合物（VOC）的氧化，特别是通过羟基自由基（OH）直接耦合到O3的形成，并有助于二级有机气溶胶（SOA），这是环境气溶胶的重要组成部分。作为南部氧化剂和气溶胶研究（SOA）的一部分，主要研究人员（PIS）计划了全面的实验室和现场研究，重点是改善对控制OH和Isoprene过程的详细机械理解，尤其是在农村环境中。一个目标是专门研究人为对生物VOC（BVOC）氧化和由此产生的SOA形成的影响。该项目解决了以下问题：1）当前机制代表VOC氧化，尤其是异戊二烯，尤其是在低NO条件下？ 2）鉴于潜在测量干扰的最新发现，当前机制/模型如何表示OH光化学？ 3）人为影响对农村VOC氧化以及由此产生的O3和SOA形成的主要机制是什么？这项研究旨在最终为改善前体排放中二级污染物效应的预测，以及减轻排放对气候，人类健康和环境的人为影响的能力的提高。 PIS还将开发一个有机大气化学标准库（OSAC），该图书馆将是一个公开可用的在线数据库，旨在改善对实验室研究和校准标准的起始材料的访问。