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    Topographic Enhancement of Eddy Efficiency in Baroclinic Equilibration

    Source: Journal of Physical Oceanography:;2014:;Volume( 044 ):;issue: 008::page 2107
    Author:
    Abernathey, Ryan
    ,
    Cessi, Paola
    DOI: 10.1175/JPO-D-14-0014.1
    Publisher: American Meteorological Society
    Abstract: he processes that determine the depth of the Southern Ocean thermocline are considered. In existing conceptual frameworks, the thermocline depth is determined by competition between the mean and eddy heat transport, with a contribution from the interaction with the stratification in the enclosed portion of the ocean. Using numerical simulations, this study examines the equilibration of an idealized circumpolar current with and without topography. The authors find that eddies are much more efficient when topography is present, leading to a shallower thermocline than in the flat case. A simple quasigeostrophic analytical model shows that the topographically induced standing wave increases the effective eddy diffusivity by increasing the local buoyancy gradients and lengthening the buoyancy contours across which the eddies transport heat. In addition to this local heat flux intensification, transient eddy heat fluxes are suppressed away from the topography, especially upstream, indicating that localized topography leads to local (absolute) baroclinic instability and its subsequent finite-amplitude equilibration, which extracts available potential energy very efficiently from the time-mean flow.
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      Topographic Enhancement of Eddy Efficiency in Baroclinic Equilibration

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4226774
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    contributor authorAbernathey, Ryan
    contributor authorCessi, Paola
    date accessioned2017-06-09T17:20:40Z
    date available2017-06-09T17:20:40Z
    date copyright2014/08/01
    date issued2014
    identifier issn0022-3670
    identifier otherams-83538.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226774
    description abstracthe processes that determine the depth of the Southern Ocean thermocline are considered. In existing conceptual frameworks, the thermocline depth is determined by competition between the mean and eddy heat transport, with a contribution from the interaction with the stratification in the enclosed portion of the ocean. Using numerical simulations, this study examines the equilibration of an idealized circumpolar current with and without topography. The authors find that eddies are much more efficient when topography is present, leading to a shallower thermocline than in the flat case. A simple quasigeostrophic analytical model shows that the topographically induced standing wave increases the effective eddy diffusivity by increasing the local buoyancy gradients and lengthening the buoyancy contours across which the eddies transport heat. In addition to this local heat flux intensification, transient eddy heat fluxes are suppressed away from the topography, especially upstream, indicating that localized topography leads to local (absolute) baroclinic instability and its subsequent finite-amplitude equilibration, which extracts available potential energy very efficiently from the time-mean flow.
    publisherAmerican Meteorological Society
    titleTopographic Enhancement of Eddy Efficiency in Baroclinic Equilibration
    typeJournal Paper
    journal volume44
    journal issue8
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-14-0014.1
    journal fristpage2107
    journal lastpage2126
    treeJournal of Physical Oceanography:;2014:;Volume( 044 ):;issue: 008
    contenttypeFulltext
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