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    Large-Eddy Simulation of Evaporatively Driven Entrainment in Cloud-Topped Mixed Layers

    Source: Journal of the Atmospheric Sciences:;2008:;Volume( 065 ):;issue: 005::page 1481
    Author:
    Yamaguchi, Takanobu
    ,
    Randall, David A.
    DOI: 10.1175/2007JAS2438.1
    Publisher: American Meteorological Society
    Abstract: Cloud-top entrainment instability (CTEI) is a hypothesized positive feedback between cloud-top entrainment and enhanced turbulence associated with buoyancy reversal. A sufficiently strong positive feedback is hypothesized to lead to the destruction of the cloud. Numerous studies have investigated the possible role of CTEI in cloud breakup, with ambiguous results. In this study, CTEI has been extensively investigated using many large-eddy simulations. An idealized experimental design has been used so as not to have any source of turbulence kinetic energy production except for entrainment due to evaporative cooling. A new method has been used to estimate the entrainment rate and to identify the inversion base and top. The results of the experiments do show the hypothesized positive feedback when the Randall?Deardorff CTEI criterion is met. When CTEI takes place in the numerical experiments, entrainment develops spontaneously through buoyancy reversal and, as a result, leads to cloud dissipation. Cloud dissipation within several hours is simulated in the cases with strong instability. A hypothesized dependence of the strength of the evaporatively driven turbulence on the cloud-top liquid water mixing ratio is confirmed. As expected, with a typical stratocumulus liquid water mixing ratio, the evaporatively driven turbulence is weak. Additional simulations with longwave radiation, surface latent heat flux, or both suggest that sufficiently strong radiative cooling can prevent cloud destruction by CTEI. For this reason, CTEI usually does not result in cloud dissipation in realistic cases.
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      Large-Eddy Simulation of Evaporatively Driven Entrainment in Cloud-Topped Mixed Layers

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4206794
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    contributor authorYamaguchi, Takanobu
    contributor authorRandall, David A.
    date accessioned2017-06-09T16:18:49Z
    date available2017-06-09T16:18:49Z
    date copyright2008/05/01
    date issued2008
    identifier issn0022-4928
    identifier otherams-65556.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4206794
    description abstractCloud-top entrainment instability (CTEI) is a hypothesized positive feedback between cloud-top entrainment and enhanced turbulence associated with buoyancy reversal. A sufficiently strong positive feedback is hypothesized to lead to the destruction of the cloud. Numerous studies have investigated the possible role of CTEI in cloud breakup, with ambiguous results. In this study, CTEI has been extensively investigated using many large-eddy simulations. An idealized experimental design has been used so as not to have any source of turbulence kinetic energy production except for entrainment due to evaporative cooling. A new method has been used to estimate the entrainment rate and to identify the inversion base and top. The results of the experiments do show the hypothesized positive feedback when the Randall?Deardorff CTEI criterion is met. When CTEI takes place in the numerical experiments, entrainment develops spontaneously through buoyancy reversal and, as a result, leads to cloud dissipation. Cloud dissipation within several hours is simulated in the cases with strong instability. A hypothesized dependence of the strength of the evaporatively driven turbulence on the cloud-top liquid water mixing ratio is confirmed. As expected, with a typical stratocumulus liquid water mixing ratio, the evaporatively driven turbulence is weak. Additional simulations with longwave radiation, surface latent heat flux, or both suggest that sufficiently strong radiative cooling can prevent cloud destruction by CTEI. For this reason, CTEI usually does not result in cloud dissipation in realistic cases.
    publisherAmerican Meteorological Society
    titleLarge-Eddy Simulation of Evaporatively Driven Entrainment in Cloud-Topped Mixed Layers
    typeJournal Paper
    journal volume65
    journal issue5
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/2007JAS2438.1
    journal fristpage1481
    journal lastpage1504
    treeJournal of the Atmospheric Sciences:;2008:;Volume( 065 ):;issue: 005
    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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