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    Abyssal Mixing: Where It Is Not

    Source: Journal of Physical Oceanography:;1996:;Volume( 026 ):;issue: 010::page 2286
    Author:
    Kunze, Eric
    ,
    Sanford, Thomas B.
    DOI: 10.1175/1520-0485(1996)026<2286:AMWIIN>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A parameterization based on internal wave/wave interaction theory, which infers turbulence production from finescale internal wave shear, is applied to 114 full-water-depth velocity profiles in the Sargasso Sea. An average eddy diffusivity of 0.1 ? 10?4 m2 s?1, independent of depth, is inferred. This value is consistent with full-water-depth microstructure measurements from abyssal basins in the eastern North Atlantic and eastern North Pacific. It is an order of magnitude smaller than the values inferred from a simple vertical advection-diffusion balance or bulk budgets. Thus, the mixing needed to close deep global water-mass budgets does not appear to occur over midlatitude abyssal plains. This suggests that ocean mixing is either (i) confined to boundary layers as in ideal thermocline theory or (ii) localized to hotspots, such as over rough topography or restrictive passages. Abyssal diffusivities do not display any dependence on bottom slope for slopes less than 7 ? 10?2 based on 5?10 km bathymetry, but are higher over convex than concave topography and higher in stronger bottom currents.
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      Abyssal Mixing: Where It Is Not

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4165746
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    contributor authorKunze, Eric
    contributor authorSanford, Thomas B.
    date accessioned2017-06-09T14:52:20Z
    date available2017-06-09T14:52:20Z
    date copyright1996/10/01
    date issued1996
    identifier issn0022-3670
    identifier otherams-28610.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4165746
    description abstractA parameterization based on internal wave/wave interaction theory, which infers turbulence production from finescale internal wave shear, is applied to 114 full-water-depth velocity profiles in the Sargasso Sea. An average eddy diffusivity of 0.1 ? 10?4 m2 s?1, independent of depth, is inferred. This value is consistent with full-water-depth microstructure measurements from abyssal basins in the eastern North Atlantic and eastern North Pacific. It is an order of magnitude smaller than the values inferred from a simple vertical advection-diffusion balance or bulk budgets. Thus, the mixing needed to close deep global water-mass budgets does not appear to occur over midlatitude abyssal plains. This suggests that ocean mixing is either (i) confined to boundary layers as in ideal thermocline theory or (ii) localized to hotspots, such as over rough topography or restrictive passages. Abyssal diffusivities do not display any dependence on bottom slope for slopes less than 7 ? 10?2 based on 5?10 km bathymetry, but are higher over convex than concave topography and higher in stronger bottom currents.
    publisherAmerican Meteorological Society
    titleAbyssal Mixing: Where It Is Not
    typeJournal Paper
    journal volume26
    journal issue10
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1996)026<2286:AMWIIN>2.0.CO;2
    journal fristpage2286
    journal lastpage2296
    treeJournal of Physical Oceanography:;1996:;Volume( 026 ):;issue: 010
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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