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    Stationary Rossby Waves in Western Boundary Current Extensions

    Source: Journal of Physical Oceanography:;1991:;Volume( 021 ):;issue: 008::page 1202
    Author:
    Campos, Edmo J. D.
    ,
    Olson, Donald B.
    DOI: 10.1175/1520-0485(1991)021<1202:SRWIWB>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The existence of temporally growing spatially damped long waves in western boundary current extensions is suggested by various authors from both an observational and theoretical point of view. Here the nature of such waves is reconsidered based on both a local analysis of a simple analytical model and numerical experiments. The analytical calculation consists of an investigation of the possible solutions of the quasi-geostrophic equation in a barotropic ocean, when a spatially constant zonal mean flaw and Laplacian lateral dissipation are considered. A previously unexplored case of a low frequency wave that undergoes amplitude growth in time but is spatially damped is explained based on energy convergence in the downstream direction. In the numerical experiments, in addition to an investigation on the realizability of the analytical solutions, effects of a tilting western boundary on the wind-driven circulation are explored. It is found that the tilt of the western boundary has a very strong effect on the penetration scale of the zonal midlatitude jet. When an approximation of the subtropical South American coastline is used, the results of the numerical computations include an energetically strong stationary pattern in the model's confluence region. This feature, although stationary in phase, has time-varying amplitude, reminiscent of observations in the Brazil-Malvinas confluence region.
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      Stationary Rossby Waves in Western Boundary Current Extensions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4164850
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    contributor authorCampos, Edmo J. D.
    contributor authorOlson, Donald B.
    date accessioned2017-06-09T14:50:04Z
    date available2017-06-09T14:50:04Z
    date copyright1991/08/01
    date issued1991
    identifier issn0022-3670
    identifier otherams-27804.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4164850
    description abstractThe existence of temporally growing spatially damped long waves in western boundary current extensions is suggested by various authors from both an observational and theoretical point of view. Here the nature of such waves is reconsidered based on both a local analysis of a simple analytical model and numerical experiments. The analytical calculation consists of an investigation of the possible solutions of the quasi-geostrophic equation in a barotropic ocean, when a spatially constant zonal mean flaw and Laplacian lateral dissipation are considered. A previously unexplored case of a low frequency wave that undergoes amplitude growth in time but is spatially damped is explained based on energy convergence in the downstream direction. In the numerical experiments, in addition to an investigation on the realizability of the analytical solutions, effects of a tilting western boundary on the wind-driven circulation are explored. It is found that the tilt of the western boundary has a very strong effect on the penetration scale of the zonal midlatitude jet. When an approximation of the subtropical South American coastline is used, the results of the numerical computations include an energetically strong stationary pattern in the model's confluence region. This feature, although stationary in phase, has time-varying amplitude, reminiscent of observations in the Brazil-Malvinas confluence region.
    publisherAmerican Meteorological Society
    titleStationary Rossby Waves in Western Boundary Current Extensions
    typeJournal Paper
    journal volume21
    journal issue8
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1991)021<1202:SRWIWB>2.0.CO;2
    journal fristpage1202
    journal lastpage1224
    treeJournal of Physical Oceanography:;1991:;Volume( 021 ):;issue: 008
    contenttypeFulltext
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