A Study of Electromagnetic Scattering by Composite Particles and of their Effect on the Radiative Properties of Clouds and Haze

复合粒子电磁散射及其对云和雾辐射特性影响的研究

• 批准号: 9204146
• 负责人: Graeme Stephens
• 金额: $ 17.46万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-04-01 至 1995-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204146&HistoricalAwards=false
• 关键词: Study; Electromagnetic; Scattering; Composite; Particles

The objective of this research is the assessment of electromagnetic scattering from spherical aerosol particles possessing internal inhomogeneities. A theoretical study entailing an exact solution of the electromagnetic boundary value problem, along with an investigation of various approximation schemes, will be conducted. In order to corroborate the theory, laboratory tests of the model will also be made. An aerosol model based on a survey of the physical and atmospheric chemistry associated with the formation of sulfate and carbonaceous aerosols and their composites will be developed. The optical properties of composite particles provided by that model will be used in a sensitivity study of the radiative properties of the aerosol and of the droplets for which the aerosol particles serve as condensation nuclei. As a final exercise, a model albedo of cirrus clouds that are made up of particles possessing internal structure will be contrasted with cirrus models that employ spheres, sphere aggregates, and small crystals as cloud particles.

本研究的目的是评估具有内部不均匀性的球形气溶胶颗粒的电磁散射。 将进行需要精确解决电磁边值问题的理论研究，以及对各种近似方案的研究。 为了证实该理论，还将对该模型进行实验室测试。 将开发基于与硫酸盐和碳质气溶胶及其复合物形成相关的物理和大气化学调查的气溶胶模型。 该模型提供的复合颗粒的光学特性将用于气溶胶和气溶胶颗粒作为凝核的液滴的辐射特性的敏感性研究。 作为最后的练习，由具有内部结构的粒子组成的卷云模型反照率将与采用球体、球体聚集体和小晶体作为云粒子的卷云模型进行对比。