Modeling and Analysis of Tropospheric Aerosol Sources, Processes, and Effects

对流层气溶胶来源、过程和影响的建模和分析

• 批准号: 0070847
• 负责人: Richard Turco
• 金额: $ 36万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2005-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0070847&HistoricalAwards=false
• 关键词: Modeling; Analysis; Tropospheric; Aerosol; Sources

This project is directed at understanding the role of ion-induced nucleation as a mechanism for new particle formation in the troposphere. This effort involves the development of a unique microphysics code that simulates a size-resolved multicomponent aerosol system via a unified collisional mechanism involving both neutral and charged particles down to molecular sizes. The model will be used to provide new analyses of existing field measurements, through case studies, sensitivity tests, and model/data intercomparisons. These studies will involve the use of air mobility spectra, which are introduced in this context for the first time. These data are useful for studying the initial stages of aerosol formation under tropospheric conditions. This work will elucidate the pathways to particle nucleation over a range of environmental conditions, and will identify mechanisms that are in accord with a variety of field measurements. We will use these results to formulate empirical relationships between nucleation rates and ambient conditions (precursor gas concentrations, background particle surface areas, local ionization rates, temperature, relative humidity, etc.).

本项目旨在了解离子诱导成核作为对流层中新粒子形成机制的作用。 这项工作涉及到一个独特的微观物理代码，模拟一个大小分辨的多组分气溶胶系统通过一个统一的碰撞机制，涉及中性和带电粒子到分子大小的发展。 该模型将用于通过案例研究、敏感性测试和模型/数据相互比较，对现有实地测量结果进行新的分析。 这些研究将涉及使用空气流动谱，这是在这种情况下首次介绍。 这些数据对研究对流层条件下气溶胶形成的初始阶段是有用的。这项工作将阐明在一系列的环境条件下的颗粒成核的途径，并将确定机制，在雅阁与各种现场测量。我们将使用这些结果来制定成核率和环境条件（前体气体浓度，背景粒子表面积，局部电离率，温度，相对湿度等）之间的经验关系。