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    A Conceptual View on Inertial Oscillations and Nocturnal Low-Level Jets

    Source: Journal of the Atmospheric Sciences:;2010:;Volume( 067 ):;issue: 008::page 2679
    Author:
    Van de Wiel, B. J. H.
    ,
    Moene, A. F.
    ,
    Steeneveld, G. J.
    ,
    Baas, P.
    ,
    Bosveld, F. C.
    ,
    Holtslag, A. A. M.
    DOI: 10.1175/2010JAS3289.1
    Publisher: American Meteorological Society
    Abstract: In the present work Blackadar?s concept of nocturnal inertial oscillations is extended. Blackadar?s concept describes frictionless inertial oscillations above the nocturnal inversion layer. The current work includes frictional effects within the nocturnal boundary layer. It is shown that the nocturnal wind speed profile describes an oscillation around the nocturnal equilibrium wind vector, rather than around the geostrophic wind vector (as in the Blackadar case). By using this perspective, continuous time-dependent wind profiles are predicted. As such, information on both the height and the magnitude of the nocturnal low-level jet is available as a function of time. Preliminary analysis shows that the proposed extension performs well in comparison with observations when a simple Ekman model is used to represent the equilibrium state in combination with a realistic initial velocity profile. In addition to jet dynamics, backward inertial oscillations are predicted at lower levels close to the surface, which also appear to be present in observations. The backward oscillation forms an important mechanism behind weakening low-level winds during the afternoon transition. Both observational and theoretical modeling studies are needed to explore this phenomenon further.
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      A Conceptual View on Inertial Oscillations and Nocturnal Low-Level Jets

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    contributor authorVan de Wiel, B. J. H.
    contributor authorMoene, A. F.
    contributor authorSteeneveld, G. J.
    contributor authorBaas, P.
    contributor authorBosveld, F. C.
    contributor authorHoltslag, A. A. M.
    date accessioned2017-06-09T16:34:13Z
    date available2017-06-09T16:34:13Z
    date copyright2010/08/01
    date issued2010
    identifier issn0022-4928
    identifier otherams-70165.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4211916
    description abstractIn the present work Blackadar?s concept of nocturnal inertial oscillations is extended. Blackadar?s concept describes frictionless inertial oscillations above the nocturnal inversion layer. The current work includes frictional effects within the nocturnal boundary layer. It is shown that the nocturnal wind speed profile describes an oscillation around the nocturnal equilibrium wind vector, rather than around the geostrophic wind vector (as in the Blackadar case). By using this perspective, continuous time-dependent wind profiles are predicted. As such, information on both the height and the magnitude of the nocturnal low-level jet is available as a function of time. Preliminary analysis shows that the proposed extension performs well in comparison with observations when a simple Ekman model is used to represent the equilibrium state in combination with a realistic initial velocity profile. In addition to jet dynamics, backward inertial oscillations are predicted at lower levels close to the surface, which also appear to be present in observations. The backward oscillation forms an important mechanism behind weakening low-level winds during the afternoon transition. Both observational and theoretical modeling studies are needed to explore this phenomenon further.
    publisherAmerican Meteorological Society
    titleA Conceptual View on Inertial Oscillations and Nocturnal Low-Level Jets
    typeJournal Paper
    journal volume67
    journal issue8
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/2010JAS3289.1
    journal fristpage2679
    journal lastpage2689
    treeJournal of the Atmospheric Sciences:;2010:;Volume( 067 ):;issue: 008
    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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