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    Spectrally Invariant Approximation within Atmospheric Radiative Transfer

    Source: Journal of the Atmospheric Sciences:;2011:;Volume( 068 ):;issue: 012::page 3094
    Author:
    Marshak, A.
    ,
    Knyazikhin, Y.
    ,
    Chiu, J. C.
    ,
    Wiscombe, W. J.
    DOI: 10.1175/JAS-D-11-060.1
    Publisher: American Meteorological Society
    Abstract: ertain algebraic combinations of single scattering albedo and solar radiation reflected from, or transmitted through, vegetation canopies do not vary with wavelength. These ?spectrally invariant relationships? are the consequence of wavelength independence of the extinction coefficient and scattering phase function in vegetation. In general, this wavelength independence does not hold in the atmosphere, but in cloud-dominated atmospheres the total extinction and total scattering phase function vary only weakly with wavelength. This paper identifies the atmospheric conditions under which the spectrally invariant approximation can accurately describe the extinction and scattering properties of cloudy atmospheres. The validity of the assumptions and the accuracy of the approximation are tested with 1D radiative transfer calculations using publicly available radiative transfer models: Discrete Ordinate Radiative Transfer (DISORT) and Santa Barbara DISORT Atmospheric Radiative Transfer (SBDART). It is shown for cloudy atmospheres with cloud optical depth above 3, and for spectral intervals that exclude strong water vapor absorption, that the spectrally invariant relationships found in vegetation canopy radiative transfer are valid to better than 5%. The physics behind this phenomenon, its mathematical basis, and possible applications to remote sensing and climate are discussed.
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      Spectrally Invariant Approximation within Atmospheric Radiative Transfer

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4218909
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    contributor authorMarshak, A.
    contributor authorKnyazikhin, Y.
    contributor authorChiu, J. C.
    contributor authorWiscombe, W. J.
    date accessioned2017-06-09T16:55:02Z
    date available2017-06-09T16:55:02Z
    date copyright2011/12/01
    date issued2011
    identifier issn0022-4928
    identifier otherams-76460.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218909
    description abstractertain algebraic combinations of single scattering albedo and solar radiation reflected from, or transmitted through, vegetation canopies do not vary with wavelength. These ?spectrally invariant relationships? are the consequence of wavelength independence of the extinction coefficient and scattering phase function in vegetation. In general, this wavelength independence does not hold in the atmosphere, but in cloud-dominated atmospheres the total extinction and total scattering phase function vary only weakly with wavelength. This paper identifies the atmospheric conditions under which the spectrally invariant approximation can accurately describe the extinction and scattering properties of cloudy atmospheres. The validity of the assumptions and the accuracy of the approximation are tested with 1D radiative transfer calculations using publicly available radiative transfer models: Discrete Ordinate Radiative Transfer (DISORT) and Santa Barbara DISORT Atmospheric Radiative Transfer (SBDART). It is shown for cloudy atmospheres with cloud optical depth above 3, and for spectral intervals that exclude strong water vapor absorption, that the spectrally invariant relationships found in vegetation canopy radiative transfer are valid to better than 5%. The physics behind this phenomenon, its mathematical basis, and possible applications to remote sensing and climate are discussed.
    publisherAmerican Meteorological Society
    titleSpectrally Invariant Approximation within Atmospheric Radiative Transfer
    typeJournal Paper
    journal volume68
    journal issue12
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-11-060.1
    journal fristpage3094
    journal lastpage3111
    treeJournal of the Atmospheric Sciences:;2011:;Volume( 068 ):;issue: 012
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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