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    Global Patterns of Mesoscale Eddy Properties and Diffusivities

    Source: Journal of Physical Oceanography:;2013:;Volume( 044 ):;issue: 003::page 1030
    Author:
    Klocker, Andreas
    ,
    Abernathey, Ryan
    DOI: 10.1175/JPO-D-13-0159.1
    Publisher: American Meteorological Society
    Abstract: esoscale eddies play a major role in the transport of tracers in the ocean. Focusing on a sector in the east Pacific, the authors present estimates of eddy diffusivities derived from kinematic tracer simulations using satellite-observed velocity fields. Meridional diffusivities are diagnosed, and how they are related to eddy properties through the mixing length formulation of Ferrari and Nikurashin, which accounts for the suppression of diffusivity due to eddy propagation relative to the mean flow, is shown. The uniqueness of this study is that, through systematically varying the zonal-mean flow, a hypothetical ?unsuppressed? diffusivity is diagnosed. At a given latitude, the unsuppressed diffusivity occurs when the zonal-mean flow equals the eddy phase speed. This provides an independent estimate of eddy phase propagation, which agrees well with theoretical arguments. It is also shown that the unsuppressed diffusivity is predicted very well by classical mixing length theory, that is, that it is proportional to the rms eddy velocity times the observed eddy size, with a spatially constant mixing efficiency of 0.35. Then, the suppression factor is estimated and it is shown that it too can be understood quantitatively in terms of easily observed mean flow properties. The authors then extrapolate from these sector experiments to the global scale, making predictions for the global surface eddy diffusivity. Together with a prognostic equation for eddy kinetic energy and a theory explaining observed eddy sizes, these concepts could potentially be used in a closure for eddy diffusivities in coarse-resolution ocean climate models.
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      Global Patterns of Mesoscale Eddy Properties and Diffusivities

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    contributor authorKlocker, Andreas
    contributor authorAbernathey, Ryan
    date accessioned2017-06-09T17:20:08Z
    date available2017-06-09T17:20:08Z
    date copyright2014/03/01
    date issued2013
    identifier issn0022-3670
    identifier otherams-83382.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226601
    description abstractesoscale eddies play a major role in the transport of tracers in the ocean. Focusing on a sector in the east Pacific, the authors present estimates of eddy diffusivities derived from kinematic tracer simulations using satellite-observed velocity fields. Meridional diffusivities are diagnosed, and how they are related to eddy properties through the mixing length formulation of Ferrari and Nikurashin, which accounts for the suppression of diffusivity due to eddy propagation relative to the mean flow, is shown. The uniqueness of this study is that, through systematically varying the zonal-mean flow, a hypothetical ?unsuppressed? diffusivity is diagnosed. At a given latitude, the unsuppressed diffusivity occurs when the zonal-mean flow equals the eddy phase speed. This provides an independent estimate of eddy phase propagation, which agrees well with theoretical arguments. It is also shown that the unsuppressed diffusivity is predicted very well by classical mixing length theory, that is, that it is proportional to the rms eddy velocity times the observed eddy size, with a spatially constant mixing efficiency of 0.35. Then, the suppression factor is estimated and it is shown that it too can be understood quantitatively in terms of easily observed mean flow properties. The authors then extrapolate from these sector experiments to the global scale, making predictions for the global surface eddy diffusivity. Together with a prognostic equation for eddy kinetic energy and a theory explaining observed eddy sizes, these concepts could potentially be used in a closure for eddy diffusivities in coarse-resolution ocean climate models.
    publisherAmerican Meteorological Society
    titleGlobal Patterns of Mesoscale Eddy Properties and Diffusivities
    typeJournal Paper
    journal volume44
    journal issue3
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-13-0159.1
    journal fristpage1030
    journal lastpage1046
    treeJournal of Physical Oceanography:;2013:;Volume( 044 ):;issue: 003
    contenttypeFulltext
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