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    Density-Driven General Circulation in a Closed Basin Using a Two-Lavel Model

    Source: Journal of Physical Oceanography:;1986:;Volume( 016 ):;issue: 005::page 902
    Author:
    Ikeda, Motoyoshi
    DOI: 10.1175/1520-0485(1986)016<0902:DDGCIA>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A rectangular-basin ocean, driven by buoyancy and density fluxes in its northern and southern portions, is studied using a two-level model. Only baroclinic motion is induced under the conditions of 1) no wind, 2) neither interfacial nor bottom stresses, 3) momentum equations, and 4) flat bottom. The relaxation problem, initiated by a north-south density difference, is studied first. It is found that a zonal geostrophic flow induces upwelling and downwelling near the eastern and western boundaries, resulting in alongshore flows characterized by frictional internal Kelvin waves. These flows are compensated by upwelling and downwelling near the northern and southern boundaries, reducing the meridional density gradient. The relaxation time scale is proportional to the area of the basin and inversely proportional to the square of an internal gravity wave speed. The second problem is a steady state forced by continuous fluxes. It has qualitatively the same flow patterns as the relaxation problem. To establish a steady state with finite amplitude circulation, both relatively small vertical diffusion, and buoyancy and density fluxes to the lower level are required. Horizontal diffusion tends to spread density anomalies offshore from the eastern and western boundaries and to diminish intensified, narrow boundary currents. Upwelling and/or downwelling in a wide central area, balancing meridional velocity with planetary beta effect in the vorticity equation, plays a minor role in maintaining the density field, except in a low latitude region.
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      Density-Driven General Circulation in a Closed Basin Using a Two-Lavel Model

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    contributor authorIkeda, Motoyoshi
    date accessioned2017-06-09T14:47:53Z
    date available2017-06-09T14:47:53Z
    date copyright1986/05/01
    date issued1986
    identifier issn0022-3670
    identifier otherams-27003.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4163961
    description abstractA rectangular-basin ocean, driven by buoyancy and density fluxes in its northern and southern portions, is studied using a two-level model. Only baroclinic motion is induced under the conditions of 1) no wind, 2) neither interfacial nor bottom stresses, 3) momentum equations, and 4) flat bottom. The relaxation problem, initiated by a north-south density difference, is studied first. It is found that a zonal geostrophic flow induces upwelling and downwelling near the eastern and western boundaries, resulting in alongshore flows characterized by frictional internal Kelvin waves. These flows are compensated by upwelling and downwelling near the northern and southern boundaries, reducing the meridional density gradient. The relaxation time scale is proportional to the area of the basin and inversely proportional to the square of an internal gravity wave speed. The second problem is a steady state forced by continuous fluxes. It has qualitatively the same flow patterns as the relaxation problem. To establish a steady state with finite amplitude circulation, both relatively small vertical diffusion, and buoyancy and density fluxes to the lower level are required. Horizontal diffusion tends to spread density anomalies offshore from the eastern and western boundaries and to diminish intensified, narrow boundary currents. Upwelling and/or downwelling in a wide central area, balancing meridional velocity with planetary beta effect in the vorticity equation, plays a minor role in maintaining the density field, except in a low latitude region.
    publisherAmerican Meteorological Society
    titleDensity-Driven General Circulation in a Closed Basin Using a Two-Lavel Model
    typeJournal Paper
    journal volume16
    journal issue5
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1986)016<0902:DDGCIA>2.0.CO;2
    journal fristpage902
    journal lastpage918
    treeJournal of Physical Oceanography:;1986:;Volume( 016 ):;issue: 005
    contenttypeFulltext
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