Collaborative Research: Laboratory Investigations of Particle-Organic Vapor Interactions: Effects on Particle Formation, Growth, and Properties

合作研究：颗粒-有机蒸气相互作用的实验室研究：对颗粒形成、生长和特性的影响

• 批准号: 1537446
• 负责人: Andrew Lambe
• 金额: $ 20万
• 依托单位: Aerodyne Research Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-15 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1537446&HistoricalAwards=false
• 关键词: Collaborative; Research; Laboratory; Investigations; Particle

This project is a collaborative effort among four institutions to improve understanding of the fundamental life cycle of atmospheric aerosol. The effort focuses on processes for the formation of very small particles in the atmosphere over a range of conditions. The goal of the proposed studies is to facilitate more accurate predictions of the influence of these particles on climate by conducting laboratory measurements that reduce uncertainties related to modeling their formation, growth and atmospherically important properties.Together the project team has extensive capabilities that include the ability to produce primary aerosol particles such as soot and secondary organic aerosol (SOA), measure and control the particle size and mass distributions, control oxidative aging of such particles via hydroxyl radical and ozone reactions over equivalent atmospheric lifetimes ranging from hours to multiple days, control production of both inorganic and organic particle coatings, measure the chemical composition of gas- and condensed-phase organic compounds, measure the cloud condensation nuclei (CCN) activity of generated particles, and measure particle optical properties.The proposed three-year laboratory research program will provide detailed information on relevant physiochemical properties of SOA as a function of oxidative processing, including interactions of gas-phase precursors with the condensed SOA. The SOA particles will be generated in conventional environmental chambers as well as in a more recently developed flow reactor that can produce SOA with high throughput over a wide range of simulated atmospheric conditions. The flow reactor enables controlled hydroxyl radical (OH) oxidation of atmospherically relevant gas phase and condensed-phase organic compounds. The residence time in the reactor is about two orders of magnitude shorter (minutes rather than days) and the OH concentration is two to three orders of magnitude higher than is attainable in environmental chambers. This project will provide a more reliable database for modeling and predicting the role of aerosols in climate change and lead to a detailed understanding of how the chemical, physical and optical properties of carbonaceous aerosols are interconnected and how they change as a function of oxidative aging.

该项目是四个机构之间的合作努力，以提高对大气气溶胶的基本生命周期的了解。这项工作重点是在各种条件下大气中形成非常小的颗粒的过程。 The goal of the proposed studies is to facilitate more accurate predictions of the influence of these particles on climate by conducting laboratory measurements that reduce uncertainties related to modeling their formation, growth and atmospherically important properties.Together the project team has extensive capabilities that include the ability to produce primary aerosol particles such as soot and secondary organic aerosol (SOA), measure and control the particle size and mass distributions, control oxidative aging of such通过羟基自由基和臭氧反应的颗粒在等效的大气寿命范围从小时到多天，控制无机和有机颗粒涂层的产生，衡量气体和凝度相机有机化合物的化学组成，并衡量云凝结核（CCN）的粒子核心的性质，并衡量层次的粒子，以衡量粒子的粒子，并衡量粒子的详细性。 SOA的生理化学特性是氧化处理的函数，包括气相前体与冷凝SOA的相互作用。 SOA颗粒将在常规环境室以及最近开发的流动反应器中生成，该反应器可以在各种模拟的大气条件下产生高吞吐量的SOA。流动反应器可实现与大气相关气相和冷凝相机有机化合物的受控羟基自由基（OH）。反应器中的停留时间约为两个数量级（几分钟而不是几天），OH浓度比环境室中可达到的数量级高两个到三个数量级。该项目将提供一个更可靠的数据库，用于建模和预测气溶胶在气候变化中的作用，并详细了解碳质气溶胶的化学，物理和光学特性如何相互联系，以及它们如何随氧化衰老的函数而变化。