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    A Multimoment Bulk Microphysics Parameterization. Part I: Analysis of the Role of the Spectral Shape Parameter

    Source: Journal of the Atmospheric Sciences:;2005:;Volume( 062 ):;issue: 009::page 3051
    Author:
    Milbrandt, J. A.
    ,
    Yau, M. K.
    DOI: 10.1175/JAS3534.1
    Publisher: American Meteorological Society
    Abstract: With increasing computer power, explicit microphysics schemes are becoming increasingly important in atmospheric models. Many schemes have followed the approach of Kessler in which one moment of the hydrometeor size distribution, proportional to the mass content, is predicted. More recently, the two-moment method has been introduced in which both the mass and the total number concentration of the hydrometeor categories are independently predicted. In bulk schemes, the size spectrum of each hydrometeor category is often described by a three-parameter gamma distribution function, N(D) = N0Dαe??D. Two-moment schemes generally treat N0 and ? as prognostic parameters while holding α constant. In this paper, the role of the spectral shape parameter, α, is investigated by examining its effects on sedimentation and microphysical growth rates. An approach is introduced for a two-moment scheme where α is allowed to vary diagnostically as a function of the mean-mass diameter. Comparisons are made between calculations using various bulk approaches?a one-moment, a two-moment, and a three-moment method?and an analytic bin model. It is found that the size-sorting mechanism, which exists in a bulk scheme when different fall velocities are applied to advect the different predicted moments, is significantly different amongst the schemes. The shape parameter plays an important role in determining the rate of size sorting. Likewise, instantaneous growth rates related to the moments are shown to be significantly affected by this parameter.
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      A Multimoment Bulk Microphysics Parameterization. Part I: Analysis of the Role of the Spectral Shape Parameter

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    contributor authorMilbrandt, J. A.
    contributor authorYau, M. K.
    date accessioned2017-06-09T16:52:26Z
    date available2017-06-09T16:52:26Z
    date copyright2005/09/01
    date issued2005
    identifier issn0022-4928
    identifier otherams-75721.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218088
    description abstractWith increasing computer power, explicit microphysics schemes are becoming increasingly important in atmospheric models. Many schemes have followed the approach of Kessler in which one moment of the hydrometeor size distribution, proportional to the mass content, is predicted. More recently, the two-moment method has been introduced in which both the mass and the total number concentration of the hydrometeor categories are independently predicted. In bulk schemes, the size spectrum of each hydrometeor category is often described by a three-parameter gamma distribution function, N(D) = N0Dαe??D. Two-moment schemes generally treat N0 and ? as prognostic parameters while holding α constant. In this paper, the role of the spectral shape parameter, α, is investigated by examining its effects on sedimentation and microphysical growth rates. An approach is introduced for a two-moment scheme where α is allowed to vary diagnostically as a function of the mean-mass diameter. Comparisons are made between calculations using various bulk approaches?a one-moment, a two-moment, and a three-moment method?and an analytic bin model. It is found that the size-sorting mechanism, which exists in a bulk scheme when different fall velocities are applied to advect the different predicted moments, is significantly different amongst the schemes. The shape parameter plays an important role in determining the rate of size sorting. Likewise, instantaneous growth rates related to the moments are shown to be significantly affected by this parameter.
    publisherAmerican Meteorological Society
    titleA Multimoment Bulk Microphysics Parameterization. Part I: Analysis of the Role of the Spectral Shape Parameter
    typeJournal Paper
    journal volume62
    journal issue9
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS3534.1
    journal fristpage3051
    journal lastpage3064
    treeJournal of the Atmospheric Sciences:;2005:;Volume( 062 ):;issue: 009
    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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