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    The Effect of Cumulus Cloud Field Anisotropy on Domain-Averaged Solar Fluxes and Atmospheric Heating Rates

    Source: Journal of the Atmospheric Sciences:;2007:;Volume( 064 ):;issue: 010::page 3499
    Author:
    Hinkelman, Laura M.
    ,
    Evans, K. Franklin
    ,
    Clothiaux, Eugene E.
    ,
    Ackerman, Thomas P.
    ,
    Stackhouse, Paul W.
    DOI: 10.1175/JAS4032.1
    Publisher: American Meteorological Society
    Abstract: Cumulus clouds can become tilted or elongated in the presence of wind shear. Nevertheless, most studies of the interaction of cumulus clouds and radiation have assumed these clouds to be isotropic. This paper describes an investigation of the effect of fair-weather cumulus cloud field anisotropy on domain-averaged solar fluxes and atmospheric heating rate profiles. A stochastic field generation algorithm was used to produce 20 three-dimensional liquid water content fields based on the statistical properties of cloud scenes from a large eddy simulation. Progressively greater degrees of x?z plane tilting and horizontal stretching were imposed on each of these scenes, so that an ensemble of scenes was produced for each level of distortion. The resulting scenes were used as input to a three-dimensional Monte Carlo radiative transfer model. Domain-averaged transmission, reflection, and absorption of broadband solar radiation were computed for each scene along with the average heating rate profile. Both tilt and horizontal stretching were found to significantly affect calculated fluxes, with the amount and sign of flux differences depending strongly on sun position relative to cloud distortion geometry. The mechanisms by which anisotropy interacts with solar fluxes were investigated by comparisons to independent pixel approximation and tilted independent pixel approximation computations for the same scenes. Cumulus anisotropy was found to most strongly impact solar radiative transfer by changing the effective cloud fraction (i.e., the cloud fraction with respect to the solar beam direction).
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      The Effect of Cumulus Cloud Field Anisotropy on Domain-Averaged Solar Fluxes and Atmospheric Heating Rates

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4218635
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    contributor authorHinkelman, Laura M.
    contributor authorEvans, K. Franklin
    contributor authorClothiaux, Eugene E.
    contributor authorAckerman, Thomas P.
    contributor authorStackhouse, Paul W.
    date accessioned2017-06-09T16:54:03Z
    date available2017-06-09T16:54:03Z
    date copyright2007/10/01
    date issued2007
    identifier issn0022-4928
    identifier otherams-76212.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218635
    description abstractCumulus clouds can become tilted or elongated in the presence of wind shear. Nevertheless, most studies of the interaction of cumulus clouds and radiation have assumed these clouds to be isotropic. This paper describes an investigation of the effect of fair-weather cumulus cloud field anisotropy on domain-averaged solar fluxes and atmospheric heating rate profiles. A stochastic field generation algorithm was used to produce 20 three-dimensional liquid water content fields based on the statistical properties of cloud scenes from a large eddy simulation. Progressively greater degrees of x?z plane tilting and horizontal stretching were imposed on each of these scenes, so that an ensemble of scenes was produced for each level of distortion. The resulting scenes were used as input to a three-dimensional Monte Carlo radiative transfer model. Domain-averaged transmission, reflection, and absorption of broadband solar radiation were computed for each scene along with the average heating rate profile. Both tilt and horizontal stretching were found to significantly affect calculated fluxes, with the amount and sign of flux differences depending strongly on sun position relative to cloud distortion geometry. The mechanisms by which anisotropy interacts with solar fluxes were investigated by comparisons to independent pixel approximation and tilted independent pixel approximation computations for the same scenes. Cumulus anisotropy was found to most strongly impact solar radiative transfer by changing the effective cloud fraction (i.e., the cloud fraction with respect to the solar beam direction).
    publisherAmerican Meteorological Society
    titleThe Effect of Cumulus Cloud Field Anisotropy on Domain-Averaged Solar Fluxes and Atmospheric Heating Rates
    typeJournal Paper
    journal volume64
    journal issue10
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS4032.1
    journal fristpage3499
    journal lastpage3520
    treeJournal of the Atmospheric Sciences:;2007:;Volume( 064 ):;issue: 010
    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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