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    Intergyre Communication in a Three-Layer Model

    Source: Journal of Physical Oceanography:;1993:;Volume( 023 ):;issue: 005::page 855
    Author:
    Chen, Liang Gui
    ,
    Dewar, William K.
    DOI: 10.1175/1520-0485(1993)023<0855:ICIATL>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A three-layer, wind-driven, general circulation model involving both subtropical and subpolar gyres has been developed to study intergyre exchange. Following some early studies, the present work allows flow to baroclinically cross the intergyre boundary. This model differs from past work by examining a three-layer fluid. Solutions with both southward and northward subsurface flows are obtained. The two principal objectives of this work are to clarify the structure and maintenance of the permanent thermocline and to aid in understanding the distribution of deep water masses. A class of thermocline structures at the zero Ekman pumping line has been constructed that permits intergyre exchange, or communication. The zones of exchange are called windows. In this study, the windows have several unique properties relative to those computed elsewhere, and exhibit relatively rich structure. Principally, the addition of an active third layer allows a new second baroclinic window to open. This new window is physically and dynamically distinct from the first window (found in previous studies), and most of the intergyre baroclinic transport can occur through it. Its appearance also supports the conjecture that the number of communication windows increases with the number of active layers. In addition to the model development, observed potential vorticity distributions have been reexamined within the context of this model. Possible explanations for deep potential vorticity contours in the North Atlantic and North Pacific oceans are proposed.
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      Intergyre Communication in a Three-Layer Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4165086
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    contributor authorChen, Liang Gui
    contributor authorDewar, William K.
    date accessioned2017-06-09T14:50:39Z
    date available2017-06-09T14:50:39Z
    date copyright1993/05/01
    date issued1993
    identifier issn0022-3670
    identifier otherams-28016.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4165086
    description abstractA three-layer, wind-driven, general circulation model involving both subtropical and subpolar gyres has been developed to study intergyre exchange. Following some early studies, the present work allows flow to baroclinically cross the intergyre boundary. This model differs from past work by examining a three-layer fluid. Solutions with both southward and northward subsurface flows are obtained. The two principal objectives of this work are to clarify the structure and maintenance of the permanent thermocline and to aid in understanding the distribution of deep water masses. A class of thermocline structures at the zero Ekman pumping line has been constructed that permits intergyre exchange, or communication. The zones of exchange are called windows. In this study, the windows have several unique properties relative to those computed elsewhere, and exhibit relatively rich structure. Principally, the addition of an active third layer allows a new second baroclinic window to open. This new window is physically and dynamically distinct from the first window (found in previous studies), and most of the intergyre baroclinic transport can occur through it. Its appearance also supports the conjecture that the number of communication windows increases with the number of active layers. In addition to the model development, observed potential vorticity distributions have been reexamined within the context of this model. Possible explanations for deep potential vorticity contours in the North Atlantic and North Pacific oceans are proposed.
    publisherAmerican Meteorological Society
    titleIntergyre Communication in a Three-Layer Model
    typeJournal Paper
    journal volume23
    journal issue5
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1993)023<0855:ICIATL>2.0.CO;2
    journal fristpage855
    journal lastpage878
    treeJournal of Physical Oceanography:;1993:;Volume( 023 ):;issue: 005
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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