Collaborative Research: Theoretical and Experimental Characterization of the Dynamics of Secondary Organic Aerosol (SOA) Materials

合作研究：二次有机气溶胶（SOA）材料动力学的理论和实验表征

• 批准号: 1507642
• 负责人: Kranthi Mandadapu
• 金额: $ 27万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-12-01 至 2018-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1507642&HistoricalAwards=false
• 关键词: Collaborative; Research; Theoretical; Experimental; Characterization

This project, funded by the Environmental Chemistry program of the Chemistry Division at the national Science Foundation, investigates the chemical and physical properties of secondary organic aerosol (SOA) particles produced in the atmosphere by reactions of gas-phase organic chemicals (emitted by vegetation, industrial and transportation sources) with ozone and hydroxyl radicals. SOA is a complex mixture of thousands of low-volatility organic species that condense on preexisting atmospheric particles and form a large fraction of atmospheric particulates that impact human health and alter visibility. The project trains students to work in an interdisciplinary team that includes fundamental physical chemists, applied aerosol physicists and atmospheric chemists. This collaborative project brings together research groups from Boston College (BC) and Aerodyne Research, Inc. (ARI) with expertise in SOA production and measurement of submicron SOA particle properties and a group at the University of California, Berkeley (UCB) with capabilities in modeling the thermodynamic and molecular dynamic properties of liquid, glassy and crystalline organic materials. The project supports a series of laboratory experiments, directed by Professor Paul Davidovits at BC and Dr. Charles Kolb at ARI, that characterize the dynamic properties of mixtures of SOA-like surrogate chemicals as well as laboratory generated SOA particles. The UCB theoretical team, led by Professor David Chandler, is formulating models to reproduce the dynamic properties of SOA measured in thin film deposition and fine particle reactive uptake experiments, with the goal of predicting the impact of relative humidity and temperature on thermodynamic and kinetic properties of SOA/water systems found in the atmosphere. The coupling of fundamental, theoretical, and experimental dynamics of glassy organic material help clarify and codify the roles of SOA in cloud formation, cloud and aerosol radiative properties and cloud precipitation. The resulting theoretical tools is used by the atmospheric science community to better predict and parameterize SOA particle climate impacts and SOA particle inhalation exposures.

该项目由国家科学基金会化学部环境化学项目资助，研究气相有机化学物质（植被、工业和交通来源排放）与臭氧和羟基自由基反应产生的二次有机气溶胶（SOA）颗粒的化学和物理性质。 SOA 是数千种低挥发性有机物质的复杂混合物，它们在预先存在的大气颗粒上凝结，形成影响人类健康并改变能见度的大部分大气颗粒。该项目培训学生在跨学科团队中工作，其中包括基础物理化学家、应用气溶胶物理学家和大气化学家。该合作项目汇集了来自波士顿学院 (BC) 和 Aerodyne Research, Inc. (ARI) 的研究小组，他们在 SOA 生产和亚微米 SOA 颗粒特性测量方面具有专业知识，而加州大学伯克利分校 (UCB) 的研究小组则具有对液体、玻璃状和结晶有机材料的热力学和分子动力学特性进行建模的能力。该项目支持由不列颠哥伦比亚省的 Paul Davidovits 教授和 ARI 的 Charles Kolb 博士指导的一系列实验室实验，这些实验表征了类 SOA 替代化学品混合物以及实验室生成的 SOA 颗粒的动态特性。由 David Chandler 教授领导的 UCB 理论团队正在制定模型来重现薄膜沉积和细颗粒反应吸收实验中测量的 SOA 动态特性，目标是预测相对湿度和温度对大气中 SOA/水系统热力学和动力学特性的影响。玻璃状有机材料的基础、理论和实验动力学的耦合有助于阐明和整理 SOA 在云形成、云和气溶胶辐射特性以及云降水中的作用。 大气科学界使用由此产生的理论工具来更好地预测和参数化 SOA 颗粒气候影响和 SOA 颗粒吸入暴露。