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    Resonance of Topographically Forced Waves in a Quasi-Geostrophic Model

    Source: Journal of the Atmospheric Sciences:;1985:;Volume( 042 ):;issue: 015::page 1653
    Author:
    Mitchell, Herschel L.
    ,
    Derome, Jacques
    DOI: 10.1175/1520-0469(1985)042<1653:ROTFWI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The resonance of stationary waves forced by topography is examined using a quasi-geostrophic model on a beta-plane channel. It is shown analytically that among the factors favoring the resonance of large, rather than synoptic or small, scale waves is the fact that the sensitivity of the large resonant responses to a change of zonal wind decreases as the scale of the resonant wave increases. A numerical model is used to examine resonance in the presence of topography having zonal wavenumber 2 with zonal flows having horizontal and vertical shear and including the effects of damping and nonlinear interactions. Although the effects of resonance are found to be important even in the presence of damping mechanisms, linear experiments with topographical forcing of reasonable amplitude indicate that a period or several weeks is required for a resonant internal mode to achieve large amplitude in the troposphere. However, as the structure of the resonant mode is such that it has much larger amplitudes in the upper atmosphere than in the troposphere, the interaction between this growing resonant mode and the mean flow which occurs when nonlinear effects are permitted triggers a stratospheric warming and zonal wind reversal. These events, which drive the system off resonance, occur long before large wave amplitudes are achieved in the lower atmosphere. The barotropic mode of zonal wavenumber 2 is shown not to resonate for reasonable values of our mean zonal wind primarily because the latter has the same (sinusoidal) meridional structure as the topography.
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      Resonance of Topographically Forced Waves in a Quasi-Geostrophic Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4155183
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    contributor authorMitchell, Herschel L.
    contributor authorDerome, Jacques
    date accessioned2017-06-09T14:25:48Z
    date available2017-06-09T14:25:48Z
    date copyright1985/08/01
    date issued1985
    identifier issn0022-4928
    identifier otherams-19103.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4155183
    description abstractThe resonance of stationary waves forced by topography is examined using a quasi-geostrophic model on a beta-plane channel. It is shown analytically that among the factors favoring the resonance of large, rather than synoptic or small, scale waves is the fact that the sensitivity of the large resonant responses to a change of zonal wind decreases as the scale of the resonant wave increases. A numerical model is used to examine resonance in the presence of topography having zonal wavenumber 2 with zonal flows having horizontal and vertical shear and including the effects of damping and nonlinear interactions. Although the effects of resonance are found to be important even in the presence of damping mechanisms, linear experiments with topographical forcing of reasonable amplitude indicate that a period or several weeks is required for a resonant internal mode to achieve large amplitude in the troposphere. However, as the structure of the resonant mode is such that it has much larger amplitudes in the upper atmosphere than in the troposphere, the interaction between this growing resonant mode and the mean flow which occurs when nonlinear effects are permitted triggers a stratospheric warming and zonal wind reversal. These events, which drive the system off resonance, occur long before large wave amplitudes are achieved in the lower atmosphere. The barotropic mode of zonal wavenumber 2 is shown not to resonate for reasonable values of our mean zonal wind primarily because the latter has the same (sinusoidal) meridional structure as the topography.
    publisherAmerican Meteorological Society
    titleResonance of Topographically Forced Waves in a Quasi-Geostrophic Model
    typeJournal Paper
    journal volume42
    journal issue15
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1985)042<1653:ROTFWI>2.0.CO;2
    journal fristpage1653
    journal lastpage1666
    treeJournal of the Atmospheric Sciences:;1985:;Volume( 042 ):;issue: 015
    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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