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    Parameterization of Convective Momentum Transport in Highly Baroclinic Conditions

    Source: Journal of the Atmospheric Sciences:;2000:;Volume( 057 ):;issue: 018::page 3035
    Author:
    Grubišić, Vanda
    ,
    Moncrieff, Mitchell W.
    DOI: 10.1175/1520-0469(2000)057<3035:POCMTI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The organization of convection by vertical shear strongly affects the transport of horizontal momentum, yet the concept of organization has received little attention in convective parameterization. Here the focus is on open-cellular convection in cold-air outbreaks under strongly baroclinic conditions that occur to the rear of midlatitude cyclones. The principles derived herein are envisaged to apply to baroclinic advection at large in similar shear flows. Open-cellular convection, forced by surface fluxes of sensible and latent heat and organized by unidirectional shear, is simulated using a three-dimensional cloud-resolving numerical model. The effects of the in-cloud pressure field, organization, and shear on momentum transport are quantified for the simulated clouds. A simple analytic model of blocked overturning provides dynamical insight into downgradient momentum transport by the simulated three-dimensional cumulonimbus ensemble. The overturning circulation having vorticity of the same sign as the ambient shear maintains the far-field flow, while the blocking effect decelerates in-cloud momentum. The combined effect is to maintain the mean flow somewhat below its undisturbed value. The numerical results and analytic predictions are used to evaluate and interpret two parameterization schemes for convective momentum transport used in operational global weather prediction and climate models at the U.K. Meteorological Office and the European Centre for Medium-Range Weather Forecasts. Finally, the authors comment on how the downgradient momentum transport by three-dimensional cumulus convection contrasts with momentum-mixing concepts as well as countergradient momentum transport by two-dimensional squall lines.
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      Parameterization of Convective Momentum Transport in Highly Baroclinic Conditions

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    contributor authorGrubišić, Vanda
    contributor authorMoncrieff, Mitchell W.
    date accessioned2017-06-09T14:36:30Z
    date available2017-06-09T14:36:30Z
    date copyright2000/09/01
    date issued2000
    identifier issn0022-4928
    identifier otherams-22699.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4159177
    description abstractThe organization of convection by vertical shear strongly affects the transport of horizontal momentum, yet the concept of organization has received little attention in convective parameterization. Here the focus is on open-cellular convection in cold-air outbreaks under strongly baroclinic conditions that occur to the rear of midlatitude cyclones. The principles derived herein are envisaged to apply to baroclinic advection at large in similar shear flows. Open-cellular convection, forced by surface fluxes of sensible and latent heat and organized by unidirectional shear, is simulated using a three-dimensional cloud-resolving numerical model. The effects of the in-cloud pressure field, organization, and shear on momentum transport are quantified for the simulated clouds. A simple analytic model of blocked overturning provides dynamical insight into downgradient momentum transport by the simulated three-dimensional cumulonimbus ensemble. The overturning circulation having vorticity of the same sign as the ambient shear maintains the far-field flow, while the blocking effect decelerates in-cloud momentum. The combined effect is to maintain the mean flow somewhat below its undisturbed value. The numerical results and analytic predictions are used to evaluate and interpret two parameterization schemes for convective momentum transport used in operational global weather prediction and climate models at the U.K. Meteorological Office and the European Centre for Medium-Range Weather Forecasts. Finally, the authors comment on how the downgradient momentum transport by three-dimensional cumulus convection contrasts with momentum-mixing concepts as well as countergradient momentum transport by two-dimensional squall lines.
    publisherAmerican Meteorological Society
    titleParameterization of Convective Momentum Transport in Highly Baroclinic Conditions
    typeJournal Paper
    journal volume57
    journal issue18
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(2000)057<3035:POCMTI>2.0.CO;2
    journal fristpage3035
    journal lastpage3049
    treeJournal of the Atmospheric Sciences:;2000:;Volume( 057 ):;issue: 018
    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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