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    Gravity Waves in a Horizontal Shear Flow. Part II: Interaction between Gravity Waves and Potential Vorticity Perturbations

    Source: Journal of Physical Oceanography:;2009:;Volume( 039 ):;issue: 003::page 497
    Author:
    Bakas, Nikolaos A.
    ,
    Farrell, Brian F.
    DOI: 10.1175/2008JPO3837.1
    Publisher: American Meteorological Society
    Abstract: Interaction among potential vorticity perturbations and propagating internal gravity waves in a horizontally sheared zonal flow is investigated. In the strong stratification limit, an initial vorticity perturbation weakly excites two propagating gravity waves while the density component of the potential vorticity perturbation is significantly amplified, potentially leading to convective collapse. If stratification is sufficiently weak, a strong coupling between vorticity perturbations and gravity waves is found and spontaneous gravity wave generation occurs. This coupling can be traced to the nonnormal interaction between the potential vorticity and gravity wave manifolds in the weak stratification limit. Vorticity perturbations amplify in energy due to downgradient Reynolds stress when their phase lines tilt against the shear and the large growth attained is transferred to propagating gravity waves. When the flow geometry is such that the excited gravity waves are confined in the vicinity of the vorticity perturbation by their trapping levels, an overall convective collapse of this region can be anticipated. On the other hand, when the flow geometry permits wave propagation, significant gravity wave emission occurs.
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      Gravity Waves in a Horizontal Shear Flow. Part II: Interaction between Gravity Waves and Potential Vorticity Perturbations

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4208934
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    • Journal of Physical Oceanography

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    contributor authorBakas, Nikolaos A.
    contributor authorFarrell, Brian F.
    date accessioned2017-06-09T16:25:03Z
    date available2017-06-09T16:25:03Z
    date copyright2009/03/01
    date issued2009
    identifier issn0022-3670
    identifier otherams-67482.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4208934
    description abstractInteraction among potential vorticity perturbations and propagating internal gravity waves in a horizontally sheared zonal flow is investigated. In the strong stratification limit, an initial vorticity perturbation weakly excites two propagating gravity waves while the density component of the potential vorticity perturbation is significantly amplified, potentially leading to convective collapse. If stratification is sufficiently weak, a strong coupling between vorticity perturbations and gravity waves is found and spontaneous gravity wave generation occurs. This coupling can be traced to the nonnormal interaction between the potential vorticity and gravity wave manifolds in the weak stratification limit. Vorticity perturbations amplify in energy due to downgradient Reynolds stress when their phase lines tilt against the shear and the large growth attained is transferred to propagating gravity waves. When the flow geometry is such that the excited gravity waves are confined in the vicinity of the vorticity perturbation by their trapping levels, an overall convective collapse of this region can be anticipated. On the other hand, when the flow geometry permits wave propagation, significant gravity wave emission occurs.
    publisherAmerican Meteorological Society
    titleGravity Waves in a Horizontal Shear Flow. Part II: Interaction between Gravity Waves and Potential Vorticity Perturbations
    typeJournal Paper
    journal volume39
    journal issue3
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/2008JPO3837.1
    journal fristpage497
    journal lastpage511
    treeJournal of Physical Oceanography:;2009:;Volume( 039 ):;issue: 003
    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