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    Statistical State Dynamics of Jet–Wave Coexistence in Barotropic Beta-Plane Turbulence

    Source: Journal of the Atmospheric Sciences:;2016:;Volume( 073 ):;issue: 005::page 2229
    Author:
    Constantinou, Navid C.
    ,
    Farrell, Brian F.
    ,
    Ioannou, Petros J.
    DOI: 10.1175/JAS-D-15-0288.1
    Publisher: American Meteorological Society
    Abstract: ets coexist with planetary-scale waves in the turbulence of planetary atmospheres. The coherent component of these structures arises from cooperative interaction between the coherent structures and the incoherent small-scale turbulence in which they are embedded. It follows that theoretical understanding of the dynamics of jets and planetary-scale waves requires adopting the perspective of statistical state dynamics (SSD), which comprises the dynamics of the interaction between coherent and incoherent components in the turbulent state. In this work, the stochastic structural stability theory (S3T) implementation of SSD for barotropic beta-plane turbulence is used to develop a theory for the jet?wave coexistence regime by separating the coherent motions consisting of the zonal jets together with a selection of large-scale waves from the smaller-scale motions that constitute the incoherent component. It is found that mean flow?turbulence interaction gives rise to jets that coexist with large-scale coherent waves in a synergistic manner. Large-scale waves that would exist only as damped modes in the laminar jet are found to be transformed into exponentially growing waves by interaction with the incoherent small-scale turbulence, which results in a change in the mode structure, allowing the mode to tap the energy of the mean jet. This mechanism of destabilization differs fundamentally and serves to augment the more familiar S3T instabilities in which jets and waves arise from homogeneous turbulence with the energy source exclusively from the incoherent eddy field and provides further insight into the cooperative dynamics of the jet?wave coexistence regime in planetary turbulence.
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      Statistical State Dynamics of Jet–Wave Coexistence in Barotropic Beta-Plane Turbulence

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    contributor authorConstantinou, Navid C.
    contributor authorFarrell, Brian F.
    contributor authorIoannou, Petros J.
    date accessioned2017-06-09T16:59:12Z
    date available2017-06-09T16:59:12Z
    date copyright2016/05/01
    date issued2016
    identifier issn0022-4928
    identifier otherams-77474.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220036
    description abstractets coexist with planetary-scale waves in the turbulence of planetary atmospheres. The coherent component of these structures arises from cooperative interaction between the coherent structures and the incoherent small-scale turbulence in which they are embedded. It follows that theoretical understanding of the dynamics of jets and planetary-scale waves requires adopting the perspective of statistical state dynamics (SSD), which comprises the dynamics of the interaction between coherent and incoherent components in the turbulent state. In this work, the stochastic structural stability theory (S3T) implementation of SSD for barotropic beta-plane turbulence is used to develop a theory for the jet?wave coexistence regime by separating the coherent motions consisting of the zonal jets together with a selection of large-scale waves from the smaller-scale motions that constitute the incoherent component. It is found that mean flow?turbulence interaction gives rise to jets that coexist with large-scale coherent waves in a synergistic manner. Large-scale waves that would exist only as damped modes in the laminar jet are found to be transformed into exponentially growing waves by interaction with the incoherent small-scale turbulence, which results in a change in the mode structure, allowing the mode to tap the energy of the mean jet. This mechanism of destabilization differs fundamentally and serves to augment the more familiar S3T instabilities in which jets and waves arise from homogeneous turbulence with the energy source exclusively from the incoherent eddy field and provides further insight into the cooperative dynamics of the jet?wave coexistence regime in planetary turbulence.
    publisherAmerican Meteorological Society
    titleStatistical State Dynamics of Jet–Wave Coexistence in Barotropic Beta-Plane Turbulence
    typeJournal Paper
    journal volume73
    journal issue5
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-15-0288.1
    journal fristpage2229
    journal lastpage2253
    treeJournal of the Atmospheric Sciences:;2016:;Volume( 073 ):;issue: 005
    contenttypeFulltext
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian
     
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian