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    A Heton Perspective of Baroclinic Eddy Transfer in Localized Open Ocean Convection

    Source: Journal of Physical Oceanography:;1996:;Volume( 026 ):;issue: 010::page 2251
    Author:
    Legg, Sonya
    ,
    Jones, Helen
    ,
    Visbeck, Martin
    DOI: 10.1175/1520-0485(1996)026<2251:AHPOBE>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A simple point-vortex ?heton? model is used to study localized ocean convection. In particular, the statistically steady state that is established when lateral buoyancy transfer, effected by baroclinic instability, offsets the localized surface buoyancy loss is investigated. Properties of the steady state, such as the statistically steady density anomaly of the convection region, are predicted using the hypothesis of a balance between baroclinic eddy transfer and the localized surface buoyancy loss. These predictions compare favorably with the values obtained through numerical integration of the heton model. The steady state of the heron model can be related to that in other convection scenarios considered in several recent studies by means of a generalized description of the localized convection. This leads to predictions of the equilibrium density anomalies in these scenarios, which concur with those obtained by other authors. Advantages of the heton model include its inviscid nature, emphasizing the independence of the fluxes affected by the baroclinic eddies from molecular processes, and its extreme economy, allowing a very large parameter space to be covered. This economy allows us to examine more complicated forcing scenarios: for example, forcing regions of varying shape. By increasing the ellipticity of the forcing region, the instability is modified by the shape and, as a result, no increase in lateral fluxes occurs despite the increased perimeter length. The parameterization of convective mixing by a redistribution of potential vorticity, implicit in the heton model, is corroborated; the heton model equilibrium state has analogous quantitative scaling behavior to that in models or laboratory experiments that resolve the vertical motions. The simplified dynamics of the heton model therefore allows the adiabatic advection resulting from baroclinic instability to be examined in isolation from vertical mixing and diffusive processes. These results demonstrate the importance of baroclinic instability in controlling the properties of a water mass generated by localized ocean convection. A complete parameterization of this process must therefore account for the fluxes induced by horizontal variations in surface buoyancy loss and affected by baroclinic instability.
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      A Heton Perspective of Baroclinic Eddy Transfer in Localized Open Ocean Convection

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4165742
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    contributor authorLegg, Sonya
    contributor authorJones, Helen
    contributor authorVisbeck, Martin
    date accessioned2017-06-09T14:52:19Z
    date available2017-06-09T14:52:19Z
    date copyright1996/10/01
    date issued1996
    identifier issn0022-3670
    identifier otherams-28607.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4165742
    description abstractA simple point-vortex ?heton? model is used to study localized ocean convection. In particular, the statistically steady state that is established when lateral buoyancy transfer, effected by baroclinic instability, offsets the localized surface buoyancy loss is investigated. Properties of the steady state, such as the statistically steady density anomaly of the convection region, are predicted using the hypothesis of a balance between baroclinic eddy transfer and the localized surface buoyancy loss. These predictions compare favorably with the values obtained through numerical integration of the heton model. The steady state of the heron model can be related to that in other convection scenarios considered in several recent studies by means of a generalized description of the localized convection. This leads to predictions of the equilibrium density anomalies in these scenarios, which concur with those obtained by other authors. Advantages of the heton model include its inviscid nature, emphasizing the independence of the fluxes affected by the baroclinic eddies from molecular processes, and its extreme economy, allowing a very large parameter space to be covered. This economy allows us to examine more complicated forcing scenarios: for example, forcing regions of varying shape. By increasing the ellipticity of the forcing region, the instability is modified by the shape and, as a result, no increase in lateral fluxes occurs despite the increased perimeter length. The parameterization of convective mixing by a redistribution of potential vorticity, implicit in the heton model, is corroborated; the heton model equilibrium state has analogous quantitative scaling behavior to that in models or laboratory experiments that resolve the vertical motions. The simplified dynamics of the heton model therefore allows the adiabatic advection resulting from baroclinic instability to be examined in isolation from vertical mixing and diffusive processes. These results demonstrate the importance of baroclinic instability in controlling the properties of a water mass generated by localized ocean convection. A complete parameterization of this process must therefore account for the fluxes induced by horizontal variations in surface buoyancy loss and affected by baroclinic instability.
    publisherAmerican Meteorological Society
    titleA Heton Perspective of Baroclinic Eddy Transfer in Localized Open Ocean Convection
    typeJournal Paper
    journal volume26
    journal issue10
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1996)026<2251:AHPOBE>2.0.CO;2
    journal fristpage2251
    journal lastpage2266
    treeJournal of Physical Oceanography:;1996:;Volume( 026 ):;issue: 010
    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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