Radiative interactions: I. Light scattering and emission from irregular particles. II. Time dependent radiative coupling of an atmosphere-ocean system

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Title: Radiative interactions: I. Light scattering and emission from irregular particles. II. Time dependent radiative coupling of an atmosphere-ocean system
Author: Li, Changhui
Abstract: In the first part of this dissertation , radiative interactions with single irregular particles are simulated . We first introduce the basic method and techniques of Finite - Difference Time -Domain method (FDTD ) , which is a powerful method to numerically solve Maxwell's equations with high accuracy . To improve the efficiency of FDTD , we also develop a parallel FDTD code . Since FDTD can simulate light scattering by arbitrary shape and compositions , we study several radiative interaction cases for single particles in an external plane parallel light source : the surface roughness effects on the scattering , electric and magnetic energy density distribution in irregular particles , and backscattered Mueller images . We also develop an innovative and accurate method to simulate the infinitesimal electric dipole radiation from inside a particle with arbitrary shape and composition . Our research and results are very important to study light scattering by irregular particles , Raman scattering and fluorescence . In the second part of the dissertation , we study radiative interactions in an atmosphere -ocean system . By using the so called Matrix operator method , not only the radiance of the radiation field , but also the polarization of the radiation field are obtained . Given the single layer information for the atmosphere , time dependent ocean surface shapes , and the ocean with no interface , the Matrix operator method couples these three layers and provides both the radiance and polarization reaching a certain detector in the time domain , which are essential for atmospheric science and oceanography . Several simple cases are studied by this method to demonstrate its accuracy and robustness . We also show the most difficulties in this method and discuss what one need to do in future research works .
URI: http : / /hdl .handle .net /1969 .1 /4135
Date: 2006-10-30

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Radiative interactions: I. Light scattering and emission from irregular particles. II. Time dependent radiative coupling of an atmosphere-ocean system. Available electronically from http : / /hdl .handle .net /1969 .1 /4135 .

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