Aerosol Investigations by Thermal Deconvolution and by Quartz Mass Water Uptake

通过热解卷积和石英质量吸水进行气溶胶研究

• 批准号: 8916172
• 负责人: Glenn Shaw
• 金额: $ 16.29万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-15 至 1993-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8916172&HistoricalAwards=false
• 关键词: Aerosol; Investigations; Thermal; Deconvolution; Quartz

The application of two new experimental methods (TDEX and QMEX) to answer questions relating to hygroscopicity, composition and the state of mixing for atmospheric aerosols will be investigated. The thermal deconvolution experiment (TDEX) is designed to provide a measure of the two dimensional probability of occurrence surface over the plane having coordinates "aerosol size" and "aerosol volatility." In this way one can gain insight into the molecular composition of aerosol samples broken down by size class; it is also possible with TDEX to derive information on the state of mixing of aerosols and to infer the presence of surfactant films on aerosol cores. The Quartz Mass Water Uptake Experiment (QMEX) yields information on the hygroscopicity of aerosols in different size classifications. Here, aerosols are size-sorted by impaction onto vibrating quartz crystals (Quartz Crystal Microbalance). By determining the alteration in resonant frequency as a function of relative humidity, one can measure Hnels exponential mass increase coefficient. These size-specific hygrograms represent important information on the physical chemistry of the aerosols and have application in cloud physics and atmospheric radiative transfer. The project will attempt to answer questions about the physical chemistry of aerosols in air mass types specifically chosen to provide examples of natural aerosol processes in the free atmosphere. Of particular interest are aerosol debris that has been cycled through nonprecipitating marine clouds, well-aged (e.g. 10-20d) industrial aerosols imported as Arctic haze to Alaska, smoke from wildfires in the Siberian a Canadian taiga, and aerosols in air masses enriched in terpenes.

本文介绍了两种新的实验方法（TDEX和 QMEX）回答与吸湿性、成分 大气气溶胶的混合状态将是 研究了 热去卷积实验（TDEX）被设计成 提供了一个二维概率的度量， 具有坐标的平面上的发生面“气溶胶 尺寸”和“气溶胶挥发性”。“通过这种方式， 深入了解气溶胶样品的分子组成 按大小分类; TDEX也可以派生 关于气溶胶混合状态的信息，并推断 气溶胶芯上存在表面活性剂膜。 石英质量吸水实验（QMEX） 不同大小气溶胶的吸湿性信息 分类。 在这里，气溶胶的大小排序的影响 振动石英晶体（石英晶体微量天平）。 通过将谐振频率的改变确定为 相对湿度的函数，可以测量Hnels指数 质量增长系数 这些特定大小的湿度图 代表了关于地球物理化学的重要信息， 气溶胶，并在云物理学和大气中的应用 辐射传递 该项目将试图回答有关 气溶胶的物理化学，特别是 选择提供自然气溶胶过程的例子， 自由的气氛。 特别令人感兴趣的是气溶胶碎片， 在非降水性的海洋云层中循环， (e.g. 10- 20 d）作为北极烟雾进口的工业气溶胶， 阿拉斯加，西伯利亚野火的烟雾，加拿大针叶林， 以及富含萜烯的气团中的气溶胶。