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    Comparative Accuracy of Diffuse Radiative Properties Computed Using Selected Multiple Scattering Approximations

    Source: Journal of the Atmospheric Sciences:;1993:;Volume( 050 ):;issue: 002::page 247
    Author:
    Harshvardhan
    ,
    King, Michael D.
    DOI: 10.1175/1520-0469(1993)050<0247:CAODRP>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Computational results have been obtained for the spherical albedo, global transmission, and global absorption of plane-parallel layers composed of cloud droplets. These computations, obtained using the doubling method for the entire range of single scattering albedos (0 ≤ ?0 ≤ 1) and for optical depths between 0.1 and 100, are compared with corresponding results obtained using selected multiple scattering approximations. Both the relative and absolute accuracies of asymptotic theory for thick layers, three diffuse two-stream approximations, and two integrated two-stream approximations are presented as a function of optical thickness and single scattering albedo for a scattering phase function representative of cloud droplets at visible wavelengths. The spherical albedo and global absorption computed using asymptotic theory are found to be accurate to better than 5% for all values of the single scattering albedo, provided the optical thickness exceeds about 2. The diffuse two-stream approximations have relative accuracies that are much worse than 5% for the spherical albedo over most of the parameter space, yet are accurate to within 5% in the global absorption when the absorption is significant. The integrated delta-Eddington scheme appears to be the most suitable model over the entire range of variables, generally producing relative errors of less than 5% in both the spherical albedo and global absorption.
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      Comparative Accuracy of Diffuse Radiative Properties Computed Using Selected Multiple Scattering Approximations

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4157110
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    contributor authorHarshvardhan
    contributor authorKing, Michael D.
    date accessioned2017-06-09T14:31:14Z
    date available2017-06-09T14:31:14Z
    date copyright1993/01/01
    date issued1993
    identifier issn0022-4928
    identifier otherams-20838.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4157110
    description abstractComputational results have been obtained for the spherical albedo, global transmission, and global absorption of plane-parallel layers composed of cloud droplets. These computations, obtained using the doubling method for the entire range of single scattering albedos (0 ≤ ?0 ≤ 1) and for optical depths between 0.1 and 100, are compared with corresponding results obtained using selected multiple scattering approximations. Both the relative and absolute accuracies of asymptotic theory for thick layers, three diffuse two-stream approximations, and two integrated two-stream approximations are presented as a function of optical thickness and single scattering albedo for a scattering phase function representative of cloud droplets at visible wavelengths. The spherical albedo and global absorption computed using asymptotic theory are found to be accurate to better than 5% for all values of the single scattering albedo, provided the optical thickness exceeds about 2. The diffuse two-stream approximations have relative accuracies that are much worse than 5% for the spherical albedo over most of the parameter space, yet are accurate to within 5% in the global absorption when the absorption is significant. The integrated delta-Eddington scheme appears to be the most suitable model over the entire range of variables, generally producing relative errors of less than 5% in both the spherical albedo and global absorption.
    publisherAmerican Meteorological Society
    titleComparative Accuracy of Diffuse Radiative Properties Computed Using Selected Multiple Scattering Approximations
    typeJournal Paper
    journal volume50
    journal issue2
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1993)050<0247:CAODRP>2.0.CO;2
    journal fristpage247
    journal lastpage259
    treeJournal of the Atmospheric Sciences:;1993:;Volume( 050 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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