A spherical-shell radiative transfer model for the calculation of limb radiances

Persistent Link:
http://hdl.handle.net/10150/288849
Title:
A spherical-shell radiative transfer model for the calculation of limb radiances
Author:
Loughman, Robert Paul, 1971-
Issue Date:
1998
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
A new spherical-shell radiative transfer model has been developed, with particular emphasis on the accurate calculation of the scattered radiance in the limb of the atmosphere. The model accounts for the spherical geometry of the atmosphere for all orders of scattering, but neglects the influence of polarization and refraction. Solutions are obtained by the successive orders of scattering method for several solar zenith angles simultaneously, using the inherent symmetry of the radiation field about the sub-solar point. The model is described by comparing and contrasting it with the model previously presented by Thome (1990) and Herman et al. (1994). The new model is tested against independent calculations to demonstrate the accuracy of the method. Its results are compared with the Monte Carlo calculations presented by Adams and Kattawar (1978) and Kattawar and Adams (1978) for a homogeneous atmosphere. Agreement is observed to within the stated statistical error of the Adams and Kattawar (1978) and Kattawar and Adams (1978) results for all lines of sight, including those in the limb. Comparisons are also made to the results obtained by the Herman et al. (1994) code for a more realistic atmospheric profile. These comparisons reveal excellent agreement outside the limb of the atmosphere, but some significant disagreement in the limb, which must be investigated further. Finally, preliminary results are presented that demonstrate the sensitivity of limb scattered radiances to changes in the ozone profile. Limb radiances are shown to be sensitive to a relatively small change in the ozone abundance in a thin layer of the atmosphere. However, the observed sensitivity is shown to decrease when aerosol scattering is added to the model atmosphere.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Physics, Atmospheric Science.; Physics, Optics.; Physics, Radiation.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Atmospheric Sciences
Degree Grantor:
University of Arizona
Advisor:
Herman, Benjamin M.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleA spherical-shell radiative transfer model for the calculation of limb radiancesen_US
dc.creatorLoughman, Robert Paul, 1971-en_US
dc.contributor.authorLoughman, Robert Paul, 1971-en_US
dc.date.issued1998en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractA new spherical-shell radiative transfer model has been developed, with particular emphasis on the accurate calculation of the scattered radiance in the limb of the atmosphere. The model accounts for the spherical geometry of the atmosphere for all orders of scattering, but neglects the influence of polarization and refraction. Solutions are obtained by the successive orders of scattering method for several solar zenith angles simultaneously, using the inherent symmetry of the radiation field about the sub-solar point. The model is described by comparing and contrasting it with the model previously presented by Thome (1990) and Herman et al. (1994). The new model is tested against independent calculations to demonstrate the accuracy of the method. Its results are compared with the Monte Carlo calculations presented by Adams and Kattawar (1978) and Kattawar and Adams (1978) for a homogeneous atmosphere. Agreement is observed to within the stated statistical error of the Adams and Kattawar (1978) and Kattawar and Adams (1978) results for all lines of sight, including those in the limb. Comparisons are also made to the results obtained by the Herman et al. (1994) code for a more realistic atmospheric profile. These comparisons reveal excellent agreement outside the limb of the atmosphere, but some significant disagreement in the limb, which must be investigated further. Finally, preliminary results are presented that demonstrate the sensitivity of limb scattered radiances to changes in the ozone profile. Limb radiances are shown to be sensitive to a relatively small change in the ozone abundance in a thin layer of the atmosphere. However, the observed sensitivity is shown to decrease when aerosol scattering is added to the model atmosphere.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectPhysics, Atmospheric Science.en_US
dc.subjectPhysics, Optics.en_US
dc.subjectPhysics, Radiation.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineAtmospheric Sciencesen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorHerman, Benjamin M.en_US
dc.identifier.proquest9901647en_US
dc.identifier.bibrecord.b38783459en_US
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