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    On “Too Fast” Baroclinic Planetary Waves in the General Circulation

    Source: Journal of Physical Oceanography:;1998:;Volume( 028 ):;issue: 009::page 1739
    Author:
    Dewar, W. K.
    DOI: 10.1175/1520-0485(1998)028<1739:OTFBPW>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Recent altimetric observations of the ocean surface reveal signatures of long planetary waves near the annual frequency band. Comparisons of the observed wave speeds and those predicted by standard linear theory suggest that the latter is inadequate as it yields different westward speeds than those measured; in the extratropical latitudes the predicted speeds are typically slower than the observations. Here the problem of long, baroclinic wave propagation in a forced, stratified ocean is considered theoretically with a view toward explaining these observations of ?too fast? planetary waves. From a quasigeostrophic analysis, it is argued that baroclinic waves in a sheared environment are accelerated to the west via their interactions with both the mean advective field and the mean potential vorticity field. Conditions under which the ratio of actual to linear phase speeds matches the observed ratio are computed and found to be typical of the open ocean. Extensions of these ideas to continuously stratified quasigeostrophic and layered planetary geostrophic systems are discussed.
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      On “Too Fast” Baroclinic Planetary Waves in the General Circulation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4166091
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    contributor authorDewar, W. K.
    date accessioned2017-06-09T14:53:09Z
    date available2017-06-09T14:53:09Z
    date copyright1998/09/01
    date issued1998
    identifier issn0022-3670
    identifier otherams-28921.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4166091
    description abstractRecent altimetric observations of the ocean surface reveal signatures of long planetary waves near the annual frequency band. Comparisons of the observed wave speeds and those predicted by standard linear theory suggest that the latter is inadequate as it yields different westward speeds than those measured; in the extratropical latitudes the predicted speeds are typically slower than the observations. Here the problem of long, baroclinic wave propagation in a forced, stratified ocean is considered theoretically with a view toward explaining these observations of ?too fast? planetary waves. From a quasigeostrophic analysis, it is argued that baroclinic waves in a sheared environment are accelerated to the west via their interactions with both the mean advective field and the mean potential vorticity field. Conditions under which the ratio of actual to linear phase speeds matches the observed ratio are computed and found to be typical of the open ocean. Extensions of these ideas to continuously stratified quasigeostrophic and layered planetary geostrophic systems are discussed.
    publisherAmerican Meteorological Society
    titleOn “Too Fast” Baroclinic Planetary Waves in the General Circulation
    typeJournal Paper
    journal volume28
    journal issue9
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1998)028<1739:OTFBPW>2.0.CO;2
    journal fristpage1739
    journal lastpage1758
    treeJournal of Physical Oceanography:;1998:;Volume( 028 ):;issue: 009
    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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