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    Cloud Top Entrainment Instability

    Source: Journal of the Atmospheric Sciences:;1980:;Volume( 037 ):;issue: 001::page 131
    Author:
    Deardorff, J. W.
    DOI: 10.1175/1520-0469(1980)037<0131:CTEI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The criterion for instability of dry air mixing into a cloud top is determined both graphically and mathematically. It is found to be identical to the buoyancy-flux instability criterion of Randall (1976) based on stratocumulus mixed-layer jump-model equations which yield a cloud top jump in ?e, for marginal stability of order ??e=?1 to ?3 K (?e), is equivalent potential temperature). Numerical calculations from a three-dimensional boundary-layer turbulence model with stratocumulus are examined from the viewpoint of cloud top entrainment instability. The entrainment rate is found to increase decisively when ??e, drops below the critical value. The resulting rapid entrainment is found to dry out the cloud from the bottom up, leaving the cloud-base height intact; in conjunction with the negative ??e value, this causes ??e/?z in the cloud layer to become negative. This in turn sets the stage for the final phase of stratocumulus breakup, whereby conditional instability of the first kind begins to operate and the cloud fraction becomes small.
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      Cloud Top Entrainment Instability

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    contributor authorDeardorff, J. W.
    date accessioned2017-06-09T14:21:12Z
    date available2017-06-09T14:21:12Z
    date copyright1980/01/01
    date issued1980
    identifier issn0022-4928
    identifier otherams-17830.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4153768
    description abstractThe criterion for instability of dry air mixing into a cloud top is determined both graphically and mathematically. It is found to be identical to the buoyancy-flux instability criterion of Randall (1976) based on stratocumulus mixed-layer jump-model equations which yield a cloud top jump in ?e, for marginal stability of order ??e=?1 to ?3 K (?e), is equivalent potential temperature). Numerical calculations from a three-dimensional boundary-layer turbulence model with stratocumulus are examined from the viewpoint of cloud top entrainment instability. The entrainment rate is found to increase decisively when ??e, drops below the critical value. The resulting rapid entrainment is found to dry out the cloud from the bottom up, leaving the cloud-base height intact; in conjunction with the negative ??e value, this causes ??e/?z in the cloud layer to become negative. This in turn sets the stage for the final phase of stratocumulus breakup, whereby conditional instability of the first kind begins to operate and the cloud fraction becomes small.
    publisherAmerican Meteorological Society
    titleCloud Top Entrainment Instability
    typeJournal Paper
    journal volume37
    journal issue1
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1980)037<0131:CTEI>2.0.CO;2
    journal fristpage131
    journal lastpage147
    treeJournal of the Atmospheric Sciences:;1980:;Volume( 037 ):;issue: 001
    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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