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    Dynamics of the Cumulus Cloud Margin: An Observational Study

    Source: Journal of the Atmospheric Sciences:;2009:;Volume( 066 ):;issue: 012::page 3660
    Author:
    Wang, Yonggang
    ,
    Geerts, Bart
    ,
    French, Jeffrey
    DOI: 10.1175/2009JAS3129.1
    Publisher: American Meteorological Society
    Abstract: Aircraft observations of shallow to moderately deep cumulus clouds are analyzed with the purpose of describing the typical horizontal structure of thermodynamic and kinematic parameters near the cumulus margin from the cloud center into the ambient clear air. The cumuli were sampled in a broad range of environments in three regions: the tropical Atlantic Ocean in winter, the Sonoran Desert during the monsoon, and the arid high plains of Wyoming in summer. The composite analysis of 1624 cumulus penetrations shows that the vertical mass flux, temperature, buoyancy, the buoyancy flux, and the turbulent kinetic energy all tend to reach a minimum near the cloud edge. Most of these variables, and also the liquid water content, the droplet concentration, and the mean droplet size, generally decrease in value from within the cumulus toward the cloud edge, slowly at first and rapidly close to the cloud edge. These findings corroborate recent observational and modeling studies and provide further evidence for significant evaporative cooling in laterally entraining and detraining eddies in the cloud margin, a transition zone within ?200 m (or ?10% of the cloud diameter) of the cloud edge. This cooling explains the tendency for downward accelerating, buoyantly driven subsidence in the cloud margin.
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      Dynamics of the Cumulus Cloud Margin: An Observational Study

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4210086
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    contributor authorWang, Yonggang
    contributor authorGeerts, Bart
    contributor authorFrench, Jeffrey
    date accessioned2017-06-09T16:28:27Z
    date available2017-06-09T16:28:27Z
    date copyright2009/12/01
    date issued2009
    identifier issn0022-4928
    identifier otherams-68519.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4210086
    description abstractAircraft observations of shallow to moderately deep cumulus clouds are analyzed with the purpose of describing the typical horizontal structure of thermodynamic and kinematic parameters near the cumulus margin from the cloud center into the ambient clear air. The cumuli were sampled in a broad range of environments in three regions: the tropical Atlantic Ocean in winter, the Sonoran Desert during the monsoon, and the arid high plains of Wyoming in summer. The composite analysis of 1624 cumulus penetrations shows that the vertical mass flux, temperature, buoyancy, the buoyancy flux, and the turbulent kinetic energy all tend to reach a minimum near the cloud edge. Most of these variables, and also the liquid water content, the droplet concentration, and the mean droplet size, generally decrease in value from within the cumulus toward the cloud edge, slowly at first and rapidly close to the cloud edge. These findings corroborate recent observational and modeling studies and provide further evidence for significant evaporative cooling in laterally entraining and detraining eddies in the cloud margin, a transition zone within ?200 m (or ?10% of the cloud diameter) of the cloud edge. This cooling explains the tendency for downward accelerating, buoyantly driven subsidence in the cloud margin.
    publisherAmerican Meteorological Society
    titleDynamics of the Cumulus Cloud Margin: An Observational Study
    typeJournal Paper
    journal volume66
    journal issue12
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/2009JAS3129.1
    journal fristpage3660
    journal lastpage3677
    treeJournal of the Atmospheric Sciences:;2009:;Volume( 066 ):;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
    yabeshDSpacePersian