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    Transport of Infrared Radiation in Cuboidal Clouds

    Source: Journal of the Atmospheric Sciences:;1981:;Volume( 038 ):;issue: 011::page 2500
    Author:
    Harshvardhan
    ,
    Weinman, James A.
    ,
    Davies, Roger
    DOI: 10.1175/1520-0469(1981)038<2500:TOIRIC>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The transport of infrared radiation in a single cuboidal cloud has been modeled using a variable azimuth two-stream (VATS) approximation. Computations have been made at 10 ?m for a Deirmendjian (1969) C-1 water cloud of single scattering albedo, ? = 0.638 and asymmetry parameter, g=0.865. Results indicate, that the emittance of the top face of the model cloud is always less than that for a plane parallel cloud of the same optical depth. The hemispheric flux escaping from the cloud top has a gradient from the censor to the edges which are warmer when the cloud is over warmer ground. Cooling rate calculations in the 8?13.6 ?m region show that there is cooling out of the sides of the cloud at all levels even when there is heating of the core from the ground below. The radiances exiting from model cuboidal clouds were computed by path integration over the source function obtained with the two-stream approximation. Results suggest that the brightness temperature measured from finite clouds will overestimate the cloud-top temperature. Some key results of the model have been compared with Monte Carlo simulations. Overall errors in flux and radiance average a few degrees for most cases.
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      Transport of Infrared Radiation in Cuboidal Clouds

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4154224
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    contributor authorHarshvardhan
    contributor authorWeinman, James A.
    contributor authorDavies, Roger
    date accessioned2017-06-09T14:22:40Z
    date available2017-06-09T14:22:40Z
    date copyright1981/11/01
    date issued1981
    identifier issn0022-4928
    identifier otherams-18240.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4154224
    description abstractThe transport of infrared radiation in a single cuboidal cloud has been modeled using a variable azimuth two-stream (VATS) approximation. Computations have been made at 10 ?m for a Deirmendjian (1969) C-1 water cloud of single scattering albedo, ? = 0.638 and asymmetry parameter, g=0.865. Results indicate, that the emittance of the top face of the model cloud is always less than that for a plane parallel cloud of the same optical depth. The hemispheric flux escaping from the cloud top has a gradient from the censor to the edges which are warmer when the cloud is over warmer ground. Cooling rate calculations in the 8?13.6 ?m region show that there is cooling out of the sides of the cloud at all levels even when there is heating of the core from the ground below. The radiances exiting from model cuboidal clouds were computed by path integration over the source function obtained with the two-stream approximation. Results suggest that the brightness temperature measured from finite clouds will overestimate the cloud-top temperature. Some key results of the model have been compared with Monte Carlo simulations. Overall errors in flux and radiance average a few degrees for most cases.
    publisherAmerican Meteorological Society
    titleTransport of Infrared Radiation in Cuboidal Clouds
    typeJournal Paper
    journal volume38
    journal issue11
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1981)038<2500:TOIRIC>2.0.CO;2
    journal fristpage2500
    journal lastpage2513
    treeJournal of the Atmospheric Sciences:;1981:;Volume( 038 ):;issue: 011
    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
    yabeshDSpacePersian