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    A Linear Balance Model of Wind-Driven, Midlatitude Ocean Circulation

    Source: Journal of Physical Oceanography:;1990:;Volume( 020 ):;issue: 009::page 1349
    Author:
    Mcwilliams, James C.
    ,
    Norton, Nancy J.
    ,
    Gent, Peter R.
    ,
    Haidvogel, Dale B.
    DOI: 10.1175/1520-0485(1990)020<1349:ALBMOW>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The Linear Balance Equations (LBE) are intermediate between the more familiar Quasi-geostrophic (QG) and Primitive Equations (PE) in both physical completeness and computational efficiency. We first present a consistent boundary-value problem for the LBE and its numerical implementation. Then we examine its solutions for equilibrium, adiabatic, wind-driven, midlatitude circulation in a rectangular ocean basin. They differ from analogous QG solutions in many respects, even for the moderately small Rossby number appropriate to this problem. The LBE solutions have 1) less total transport; 2) a broader, weaker, more surface-intensified mean Gulf Stream with sizable standing menders and a shorter penetration length into the basin interior; 3) an enhancement of the mean thermocline circulation and its associated mesoscale eddies in the subtropical gyre relative to the subpolar gyre; 4) an enhanced eddy generation rate by Reynolds stress work and a diminished generation rate by potential energy conversion; and 5) greater eddy energy in the Gulf Stream and neighboring recirculation zone but diminished eddy energy in the far field. These solution differences are due to the combined dynamical influences of both a more general form of the Coriolis force and the ageostrophic buoyancy advection in the LBE, with the former effect the more sizable in this problem. One can partially summarize the relations between LBE and QG solutions by stating that the dynamics of the former have an intrinsic meridional asymmetry, absent in the latter, which is the general source of many of the more specific differences.
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      A Linear Balance Model of Wind-Driven, Midlatitude Ocean Circulation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4164707
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    contributor authorMcwilliams, James C.
    contributor authorNorton, Nancy J.
    contributor authorGent, Peter R.
    contributor authorHaidvogel, Dale B.
    date accessioned2017-06-09T14:49:40Z
    date available2017-06-09T14:49:40Z
    date copyright1990/09/01
    date issued1990
    identifier issn0022-3670
    identifier otherams-27676.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4164707
    description abstractThe Linear Balance Equations (LBE) are intermediate between the more familiar Quasi-geostrophic (QG) and Primitive Equations (PE) in both physical completeness and computational efficiency. We first present a consistent boundary-value problem for the LBE and its numerical implementation. Then we examine its solutions for equilibrium, adiabatic, wind-driven, midlatitude circulation in a rectangular ocean basin. They differ from analogous QG solutions in many respects, even for the moderately small Rossby number appropriate to this problem. The LBE solutions have 1) less total transport; 2) a broader, weaker, more surface-intensified mean Gulf Stream with sizable standing menders and a shorter penetration length into the basin interior; 3) an enhancement of the mean thermocline circulation and its associated mesoscale eddies in the subtropical gyre relative to the subpolar gyre; 4) an enhanced eddy generation rate by Reynolds stress work and a diminished generation rate by potential energy conversion; and 5) greater eddy energy in the Gulf Stream and neighboring recirculation zone but diminished eddy energy in the far field. These solution differences are due to the combined dynamical influences of both a more general form of the Coriolis force and the ageostrophic buoyancy advection in the LBE, with the former effect the more sizable in this problem. One can partially summarize the relations between LBE and QG solutions by stating that the dynamics of the former have an intrinsic meridional asymmetry, absent in the latter, which is the general source of many of the more specific differences.
    publisherAmerican Meteorological Society
    titleA Linear Balance Model of Wind-Driven, Midlatitude Ocean Circulation
    typeJournal Paper
    journal volume20
    journal issue9
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1990)020<1349:ALBMOW>2.0.CO;2
    journal fristpage1349
    journal lastpage1378
    treeJournal of Physical Oceanography:;1990:;Volume( 020 ):;issue: 009
    contenttypeFulltext
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