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型研究，以研究大气中新颗粒的形成和生长（NPFG）的过程。这项研究将通过改善空气质量和气候模型造福社会。实验室研究将重点关注甲磺酸（MSA）与胺在水存在下的反应，这种机制已被证明可以非常有效地形成新颗粒。一旦颗粒形成，尽管存在过量的水蒸气和MSA或胺，它们的生长仍受到限制，这表明种子核在空气中的生长需要吸收其他有机物质。实验中精心挑选了代表大气物种的具有不同结构和官能团的有机化合物。项目目标是：（1）从气相酸、胺、水的反应中阐明NPFG的基本机制和动力学。蒸气和一组代表性的大气有机化合物； (2) 开发这些过程的参数化，准确描述复杂混合物中的 NPFG，适合在大气模型中使用。通过该项目开发的 NPFG 参数化将被纳入区域空气质量模型，并用于评估新颗粒形成对区域规模的影响。

项目成果

Introductory lecture: atmospheric chemistry in the Anthropocene

入门讲座：人类世的大气化学

• DOI: 10.1039/c7fd00161d
• 发表时间: 2017-01
• 期刊: Faraday Discuss.
• 作者: Finlayson

New insights into atmospherically relevant reaction systems using direct analysis in real-time mass spectrometry (DART-MS)

使用实时质谱 (DART-MS) 直接分析对大气相关反应系统的新见解

• DOI: 10.5194/amt-10-1373-2017
• 发表时间: 2017-01
• 期刊: Atmospheric Measurement Techniques
• 影响因子: 3.8
• 作者: Zhao, Yue;Fairhurst, Michelle C.;Wingen, Lisa M.;Perraud, Véronique;Ezell, Michael J.;Finlayson
• 通讯作者: Finlayson