Electron-beam Analysis of Individual Aerosol Particles: Applications to Atmospheric Chemistry

该项目将采用自动电子束仪器， 确定个体的化学成分、大小和形状 对流层气溶胶中的微粒。 这些粒子很重要 由于它们对太阳辐射平衡和气候的影响， 大气层的稳定。 对流层中部的样本， 行星边界层将从遥远的地点获得， 主要分布在北太平洋和北极地区， 全球对流层化学的几个重要方面。 所得数据将允许识别组分颗粒类型 并将被应用于诸如远程运输的问题， 粒子和北极霾的性质。 用于无人值守的方法， 使用扫描自动分析单个颗粒 电子显微镜和电子探针将被修改， 加强对亚微米颗粒的常规分析。 进展 分析方法结合选定的气溶胶研究， 从而更好地定义粒子源， 粒子在对流层中的作用。

The project will employ automated electron-beam instruments to determine the chemical compositions, sizes, and shapes of individual particles from tropospheric aerosols. Such particles are important because of their impact on solar radiation balance and climatic stability of the atmosphere. Samples from the mid-troposphere and planetary boundary layer will be obtained from remote sites, primarily in the North Pacific and Arctic regions, in order to study several significant aspects of global tropospheric chemistry. Resulting data will allow identification of component particle types and will be applied to problems such as long-range transport of particles and the nature of Arctic haze. Methods for unattended, automated analysis of individual particles using the scanning electron microscope and electron microprobe will be modified to enhance the routine analysis of submicron particles. Advances in the analytical methods combined with the selected aerosol studies will result in better definition of the particle sources and new insights into the role of particles in the troposphere.