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

本研究的目的是评估 球形气溶胶粒子的电磁散射 具有内部不均匀性。 一项理论研究， 电磁边值问题的精确解， 沿着对各种近似方案的研究， 进行。 为了证实这一理论，实验室测试 模型也将被制作。 一个气溶胶模式的基础上调查的物理和 与硫酸盐形成有关的大气化学， 将开发含碳气溶胶及其复合物。 的 由该模型提供的复合颗粒的光学性质 将用于对辐射特性的敏感性研究， 气溶胶和气溶胶颗粒 充当凝结核。 作为最后的练习，一个模型展示了卷云， 由具有内部结构的颗粒组成， 与采用球体的卷云模型相比，球体 聚集体和小晶体作为云颗粒。

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.