The light scattering problem and its application in atmospheric science is studied
in this thesis. In the first part of this thesis, light scattering theory of single irregular
particles is investigated. We first introduce the basic concepts of the light scattering
problem. T-matrix ansatz, as well as the null-field technique, are introduced in the
following sections. Three geometries, including sphere, cylinder and hexagonal column,
are defined subsequently. Corresponding light scattering properties (i.e., T-matrix and
Mueller Matrix) of those models with arbitrary sizes are simulated via the T-matrix
method.
In order to improve the efficiency for the algorithms of single-light scattering, we
present a user-friendly database software package of the single-scattering properties of
individual dust-like aerosol particles. The second part of this thesis describes this
database in detail. Its application to radiative transfer calculations in a spectral region
from ultraviolet (UV) to far-infrared (far-IR) is introduced as well. To expand the degree
of morphological freedom of the commonly used spheroidal and spherical models, triaxial
ellipsoids were assumed to be the overall shape of dust-like aerosol particles. The
software package allows for the derivation of the bulk optical properties for a given distribution of particle microphysical parameters (i.e., refractive index, size parameter
and two aspect ratios). The array-oriented single-scattering property data sets are stored
in the NetCDF format.
The third part of this thesis examines the applicability of the tri-axial ellipsoidal
dust model. In this part, the newly built database is equipped in the study. The precomputed
optical properties of tri-axial models are imported to a polarized addingdoubling
radiative transfer (RT) model. The radiative transfer property of a well-defined
atmosphere layer is consequently simulated. Furthermore, several trial retrieval
procedures are taken based on a combination of intensity and polarization in the results of
RT simulation. The retrieval results show a high precision and indicate a further
application in realistic studies.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2010-12-8914 |
| Date | 2010 December 1900 |
| Creators | Meng, Zhaokai |
| Contributors | Yang, Ping, Kattawar, George W. |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | application/pdf |
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