Probing Mechanisms of New Particle Formation and Growth: A Combined Experimental, Theoretical and Modeling Approach

探索新粒子形成和生长的机制：实验、理论和建模相结合的方法

• 批准号: 1443140
• 负责人: Barbara Finlayson-Pitts
• 金额: $ 87.3万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-10-01 至 2018-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1443140&HistoricalAwards=false
• 关键词: Probing; Mechanisms; New; Particle; Formation

A series of laboratory and modeling studies will be conducted to study the process of new particle formation and growth (NPFG) in the atmosphere. This research will benefit society through improved air quality and climate modeling.Laboratory studies will focus on the reactions of methanesulfonic (MSA) acid with amines in the presence of water, a mechanism that has been shown to form new particles very efficiently. Once particles form, their growth is limited despite the presence of excess water vapor and either MSA or amine, suggesting that the growth of the seed nuclei in air requires the uptake of other organic species. Organic compounds with different structures and functional groups that are representative of atmospheric species have been carefully selected for the experiments.The project objectives are: (1) to elucidate the fundamental mechanisms and kinetics of NPFG from the reactions of gas phase acids, amines, water vapor, and a suite of representative atmospheric organic compounds; and (2) to develop a parameterization of these processes that accurately describes NPFG in complex mixtures that is appropriate for use in atmospheric models. The NPFG parameterization developed through this project will be incorporated into a regional air quality model and used to assess the impacts of new particle formation on a regional scale.

将进行一系列实验室和模拟研究，以研究大气中新粒子的形成和生长过程。这项研究将通过改善空气质量和气候模拟而造福社会。实验室研究将重点放在甲烷磺酸(MSA)酸与胺在水存在下的反应，这是一种已被证明非常有效地形成新颗粒的机制。一旦颗粒形成，即使存在过量的水蒸气和MSA或胺，它们的生长也是有限的，这表明种子核在空气中的生长需要其他有机物种的吸收。本项目的目标是：(1)从气相酸、胺、水蒸气和一系列具有代表性的大气有机化合物的反应中阐明NPFG的基本机理和动力学；以及(2)开发这些过程的参数化，准确地描述适用于大气模型的复杂混合物中的NPFG。通过该项目开发的NPFG参数化将被纳入区域空气质量模式，并用于评估区域尺度上新颗粒形成的影响。