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    A Climatological Parameterization for Cumulus Clouds

    Source: Journal of the Atmospheric Sciences:;1991:;Volume( 048 ):;issue: 021::page 2367
    Author:
    Blyth, A. M.
    ,
    Latham, J.
    DOI: 10.1175/1520-0469(1991)048<2367:ACPFCC>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A research airplane was used to study the microphysical characteristics of ice-free, nonprecipitating summertime cumulus clouds in Montana. Each cloud was penetrated at a multiplicity of levels encompassing, in general, a large fraction of the cloud depth. Similar studies covering a more limited altitude range were made in New Mexico. The clouds were substantially diluted by entrainment of environmental air, which produced great variability?at all levels and on all scales of measurement?in the liquid water content, L, and droplet number concentration, N. The effective radius, reff, at any particular level was found to be essentially independent of L or N. Consideration of this result leads to the prediction that the parameter A = reff/rad ≈ 1 everywhere within these clouds, where rad = (?π?w)? (Lad/N)?, Nad and Lad are the ?adiabatic? values of N and L, and ?w is the density of water. Analysis of the airborne data (35 cloud penetrations) for the Montana cumuli reveals that A = 0.83 ± 0.07, while for the New Mexico study (25 penetrations) A = 0.93 ± 0.05. Thus, the foregoing prediction is confirmed to a reasonable degree of accuracy. Model calculations for both Montana and Hawaii cumulus consistently yield values of A close to 1.0. It is considered that the parameter A should be useful in climate modeling.
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      A Climatological Parameterization for Cumulus Clouds

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4156865
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    contributor authorBlyth, A. M.
    contributor authorLatham, J.
    date accessioned2017-06-09T14:30:35Z
    date available2017-06-09T14:30:35Z
    date copyright1991/11/01
    date issued1991
    identifier issn0022-4928
    identifier otherams-20617.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4156865
    description abstractA research airplane was used to study the microphysical characteristics of ice-free, nonprecipitating summertime cumulus clouds in Montana. Each cloud was penetrated at a multiplicity of levels encompassing, in general, a large fraction of the cloud depth. Similar studies covering a more limited altitude range were made in New Mexico. The clouds were substantially diluted by entrainment of environmental air, which produced great variability?at all levels and on all scales of measurement?in the liquid water content, L, and droplet number concentration, N. The effective radius, reff, at any particular level was found to be essentially independent of L or N. Consideration of this result leads to the prediction that the parameter A = reff/rad ≈ 1 everywhere within these clouds, where rad = (?π?w)? (Lad/N)?, Nad and Lad are the ?adiabatic? values of N and L, and ?w is the density of water. Analysis of the airborne data (35 cloud penetrations) for the Montana cumuli reveals that A = 0.83 ± 0.07, while for the New Mexico study (25 penetrations) A = 0.93 ± 0.05. Thus, the foregoing prediction is confirmed to a reasonable degree of accuracy. Model calculations for both Montana and Hawaii cumulus consistently yield values of A close to 1.0. It is considered that the parameter A should be useful in climate modeling.
    publisherAmerican Meteorological Society
    titleA Climatological Parameterization for Cumulus Clouds
    typeJournal Paper
    journal volume48
    journal issue21
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1991)048<2367:ACPFCC>2.0.CO;2
    journal fristpage2367
    journal lastpage2371
    treeJournal of the Atmospheric Sciences:;1991:;Volume( 048 ):;issue: 021
    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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