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    Bulk Convergence of Cloud-Resolving Simulations of Moist Convection over Complex Terrain

    Source: Journal of the Atmospheric Sciences:;2012:;Volume( 069 ):;issue: 007::page 2207
    Author:
    Langhans, Wolfgang
    ,
    Schmidli, Juerg
    ,
    Schär, Christoph
    DOI: 10.1175/JAS-D-11-0252.1
    Publisher: American Meteorological Society
    Abstract: he explicit treatment of moist convection in cloud-resolving models with kilometer-scale horizontal resolution is increasingly used for atmospheric research and numerical weather prediction purposes. However, several previous studies have implicitly questioned the physical validity of this approach, as the accurate representation of the structure and evolution of moist convective phenomena requires considerably higher resolution. Unlike these studies, which focused on single convective systems, here the convergence of bulk properties of an ensemble of moist convective cells in kilometer-scale simulations is considered.To address the convergence, the authors focus on the bulk net heating and moistening in a large control volume, the associated vertical fluxes, and the diurnal evolution of regionally averaged precipitation. Besides numerical convergence, ?physical? convergence (Reynolds number increases with resolution) is addressed for two conceptually different subgrid-mixing approaches (1D mesoscale and 3D LES). Simulations are conducted for a 9-day period of diurnal summer convection over the Alps, using a large computational domain with grid spacings of 4.4, 2.2, 1.1, and 0.55 km and grid-independent topography.Results show that for the model and episode considered, the simulated bulk properties and vertical fluxes converge numerically toward the 0.55-km solution. In terms of bulk effects, differences between the simulations are surprisingly small, even within the physical convergence framework that exhibits a sensitivity of the small-scale dynamics and ensuing convective structures to the horizontal resolution. Despite some sensitivities related to the applied turbulence closure, the results support the feasibility of kilometer-scale models to appropriately represent the bulk feedbacks between moist convection and the larger-scale flow.
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      Bulk Convergence of Cloud-Resolving Simulations of Moist Convection over Complex Terrain

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    contributor authorLanghans, Wolfgang
    contributor authorSchmidli, Juerg
    contributor authorSchär, Christoph
    date accessioned2017-06-09T16:54:36Z
    date available2017-06-09T16:54:36Z
    date copyright2012/07/01
    date issued2012
    identifier issn0022-4928
    identifier otherams-76362.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218801
    description abstracthe explicit treatment of moist convection in cloud-resolving models with kilometer-scale horizontal resolution is increasingly used for atmospheric research and numerical weather prediction purposes. However, several previous studies have implicitly questioned the physical validity of this approach, as the accurate representation of the structure and evolution of moist convective phenomena requires considerably higher resolution. Unlike these studies, which focused on single convective systems, here the convergence of bulk properties of an ensemble of moist convective cells in kilometer-scale simulations is considered.To address the convergence, the authors focus on the bulk net heating and moistening in a large control volume, the associated vertical fluxes, and the diurnal evolution of regionally averaged precipitation. Besides numerical convergence, ?physical? convergence (Reynolds number increases with resolution) is addressed for two conceptually different subgrid-mixing approaches (1D mesoscale and 3D LES). Simulations are conducted for a 9-day period of diurnal summer convection over the Alps, using a large computational domain with grid spacings of 4.4, 2.2, 1.1, and 0.55 km and grid-independent topography.Results show that for the model and episode considered, the simulated bulk properties and vertical fluxes converge numerically toward the 0.55-km solution. In terms of bulk effects, differences between the simulations are surprisingly small, even within the physical convergence framework that exhibits a sensitivity of the small-scale dynamics and ensuing convective structures to the horizontal resolution. Despite some sensitivities related to the applied turbulence closure, the results support the feasibility of kilometer-scale models to appropriately represent the bulk feedbacks between moist convection and the larger-scale flow.
    publisherAmerican Meteorological Society
    titleBulk Convergence of Cloud-Resolving Simulations of Moist Convection over Complex Terrain
    typeJournal Paper
    journal volume69
    journal issue7
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-11-0252.1
    journal fristpage2207
    journal lastpage2228
    treeJournal of the Atmospheric Sciences:;2012:;Volume( 069 ):;issue: 007
    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
    yabeshDSpacePersian