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    On the Mechanism Underlying the Spontaneous Emergence of Barotropic Zonal Jets

    Source: Journal of the Atmospheric Sciences:;2013:;Volume( 070 ):;issue: 007::page 2251
    Author:
    Bakas, Nikolaos A.
    ,
    Ioannou, Petros J.
    DOI: 10.1175/JAS-D-12-0102.1
    Publisher: American Meteorological Society
    Abstract: onal jets are commonly observed to spontaneously emerge in a ?-plane channel from a background of turbulence that is sustained in a statistical steady state by homogeneous stochastic excitation and dissipation of vorticity. The mechanism for jet formation is examined in this work within the statistical wave?mean flow interaction framework of stochastic structural stability theory (SSST) that makes predictions for the emergence of zonal jets in ?-plane turbulence. Using the coupled dynamical SSST system that governs the joint evolution of the second-order statistics and the mean flow, the structural stability of the spatially homogeneous statistical equilibrium with no mean zonal jets is studied. It is shown that close to the structural stability boundary, the eddy?mean flow dynamics can be split into two competing processes. The first, which is shearing of the eddies by the local shear described by Orr dynamics in a ? plane, is shown in the limit of infinitesimal shear to lead to the formation of jets. The second, which is momentum flux divergence resulting from lateral wave propagation on the nonuniform local mean vorticity gradient, is shown to oppose jet formation. The upgradient momentum fluxes due to shearing of the eddies are shown to act exactly as negative viscosity for an anisotropic forcing and as negative hyperviscosity for isotropic forcing. The downgradient fluxes due to wave flux divergence are shown to act hyperdiffusively.
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      On the Mechanism Underlying the Spontaneous Emergence of Barotropic Zonal Jets

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4218943
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    contributor authorBakas, Nikolaos A.
    contributor authorIoannou, Petros J.
    date accessioned2017-06-09T16:55:08Z
    date available2017-06-09T16:55:08Z
    date copyright2013/07/01
    date issued2013
    identifier issn0022-4928
    identifier otherams-76491.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218943
    description abstractonal jets are commonly observed to spontaneously emerge in a ?-plane channel from a background of turbulence that is sustained in a statistical steady state by homogeneous stochastic excitation and dissipation of vorticity. The mechanism for jet formation is examined in this work within the statistical wave?mean flow interaction framework of stochastic structural stability theory (SSST) that makes predictions for the emergence of zonal jets in ?-plane turbulence. Using the coupled dynamical SSST system that governs the joint evolution of the second-order statistics and the mean flow, the structural stability of the spatially homogeneous statistical equilibrium with no mean zonal jets is studied. It is shown that close to the structural stability boundary, the eddy?mean flow dynamics can be split into two competing processes. The first, which is shearing of the eddies by the local shear described by Orr dynamics in a ? plane, is shown in the limit of infinitesimal shear to lead to the formation of jets. The second, which is momentum flux divergence resulting from lateral wave propagation on the nonuniform local mean vorticity gradient, is shown to oppose jet formation. The upgradient momentum fluxes due to shearing of the eddies are shown to act exactly as negative viscosity for an anisotropic forcing and as negative hyperviscosity for isotropic forcing. The downgradient fluxes due to wave flux divergence are shown to act hyperdiffusively.
    publisherAmerican Meteorological Society
    titleOn the Mechanism Underlying the Spontaneous Emergence of Barotropic Zonal Jets
    typeJournal Paper
    journal volume70
    journal issue7
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-12-0102.1
    journal fristpage2251
    journal lastpage2271
    treeJournal of the Atmospheric Sciences:;2013:;Volume( 070 ):;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