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    A Closure for Updraft–Downdraft Representation of Subgrid-Scale Fluxes in Cloud-Resolving Models

    Source: Monthly Weather Review:;2013:;volume( 142 ):;issue: 002::page 703
    Author:
    Moeng, Chin-Hoh
    DOI: 10.1175/MWR-D-13-00166.1
    Publisher: American Meteorological Society
    Abstract: closure relationship between subgrid-scale (SGS) updraft?downdraft differences and resolvable-scale (RS) variables is proposed and tested for cloud-resolving models (CRMs), based on a data analysis of a large-eddy simulation (LES) of deep convection. The LES flow field is partitioned into CRM-RS and CRM-SGS using a cutoff scale that corresponds to a typical CRM grid resolution. This study first demonstrates the capability of an updraft?downdraft model framework in representing the SGS fluxes of heat, moisture, and momentum over the entire deep convection layer. It then formulates a closure scheme to relate SGS updraft?downdraft differences to horizontal gradients of RS variables. The closure is based on the idea that largest SGS and smallest RS motions are spectrally linked and hence their horizontal fluctuations must be strongly communicated. This relation leads to an SGS scheme that expresses vertical SGS fluxes in terms of horizontal gradients of RS variables, which differs from conventional downgradient eddy diffusivity models. The new scheme is shown to better represent the forward and backscatter energy transfer between CRM-RS and CRM-SGS components than conventional eddy-viscosity models.
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      A Closure for Updraft–Downdraft Representation of Subgrid-Scale Fluxes in Cloud-Resolving Models

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4230229
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    contributor authorMoeng, Chin-Hoh
    date accessioned2017-06-09T17:31:16Z
    date available2017-06-09T17:31:16Z
    date copyright2014/02/01
    date issued2013
    identifier issn0027-0644
    identifier otherams-86648.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4230229
    description abstractclosure relationship between subgrid-scale (SGS) updraft?downdraft differences and resolvable-scale (RS) variables is proposed and tested for cloud-resolving models (CRMs), based on a data analysis of a large-eddy simulation (LES) of deep convection. The LES flow field is partitioned into CRM-RS and CRM-SGS using a cutoff scale that corresponds to a typical CRM grid resolution. This study first demonstrates the capability of an updraft?downdraft model framework in representing the SGS fluxes of heat, moisture, and momentum over the entire deep convection layer. It then formulates a closure scheme to relate SGS updraft?downdraft differences to horizontal gradients of RS variables. The closure is based on the idea that largest SGS and smallest RS motions are spectrally linked and hence their horizontal fluctuations must be strongly communicated. This relation leads to an SGS scheme that expresses vertical SGS fluxes in terms of horizontal gradients of RS variables, which differs from conventional downgradient eddy diffusivity models. The new scheme is shown to better represent the forward and backscatter energy transfer between CRM-RS and CRM-SGS components than conventional eddy-viscosity models.
    publisherAmerican Meteorological Society
    titleA Closure for Updraft–Downdraft Representation of Subgrid-Scale Fluxes in Cloud-Resolving Models
    typeJournal Paper
    journal volume142
    journal issue2
    journal titleMonthly Weather Review
    identifier doi10.1175/MWR-D-13-00166.1
    journal fristpage703
    journal lastpage715
    treeMonthly Weather Review:;2013:;volume( 142 ):;issue: 002
    contenttypeFulltext
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