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    Scaling Turbulent Dissipation in the Transition Layer

    Source: Journal of Physical Oceanography:;2013:;Volume( 043 ):;issue: 011::page 2475
    Author:
    Sun, Oliver M.
    ,
    Jayne, Steven R.
    ,
    Polzin, Kurt L.
    ,
    Rahter, Bryan A.
    ,
    St. Laurent, Louis C.
    DOI: 10.1175/JPO-D-13-057.1
    Publisher: American Meteorological Society
    Abstract: ata from three midlatitude, month-long surveys are examined for evidence of enhanced vertical mixing associated with the transition layer (TL), here defined as the strongly stratified layer that exists between the well mixed layer and the thermocline below. In each survey, microstructure estimates of turbulent dissipation were collected concurrently with fine-structure stratification and shear. Survey-wide averages are formed in a ?TL coordinate? zTL, which is referenced around the depth of maximum stratification for each profile. Averaged profiles show characteristic TL structures such as peaks in stratification N2 and shear variance S2, which fall off steeply above zTL = 0 and more gradually below. Turbulent dissipation rates ? are 5?10 times larger than those found in the upper thermocline (TC). The gradient Richardson number Ri = N2/S2 becomes unstable (Ri < 0.25) within ~10 m of the TL upper boundary, suggesting that shear instability is active in the TL for zTL > 0. Ri is stable for zTL ≤ 0. Turbulent dissipation is found to scale exponentially with depth for zTL ≤ 0, but the decay scales are different for the TL and upper TC: ? scales well with either N2 or S2. Owing to the strong correlation between S2 and N2, existing TC scalings of the form ? ~ |S|p|N|q overpredict variations in ?. The scale dependence of shear variance is not found to significantly affect the scalings of ? versus N2 and S2 for zTL ≤ 0. However, the onset of unstable Ri at the top of the TL is sensitively dependent to the resolution of the shears.
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      Scaling Turbulent Dissipation in the Transition Layer

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    contributor authorSun, Oliver M.
    contributor authorJayne, Steven R.
    contributor authorPolzin, Kurt L.
    contributor authorRahter, Bryan A.
    contributor authorSt. Laurent, Louis C.
    date accessioned2017-06-09T17:20:30Z
    date available2017-06-09T17:20:30Z
    date copyright2013/11/01
    date issued2013
    identifier issn0022-3670
    identifier otherams-83496.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226727
    description abstractata from three midlatitude, month-long surveys are examined for evidence of enhanced vertical mixing associated with the transition layer (TL), here defined as the strongly stratified layer that exists between the well mixed layer and the thermocline below. In each survey, microstructure estimates of turbulent dissipation were collected concurrently with fine-structure stratification and shear. Survey-wide averages are formed in a ?TL coordinate? zTL, which is referenced around the depth of maximum stratification for each profile. Averaged profiles show characteristic TL structures such as peaks in stratification N2 and shear variance S2, which fall off steeply above zTL = 0 and more gradually below. Turbulent dissipation rates ? are 5?10 times larger than those found in the upper thermocline (TC). The gradient Richardson number Ri = N2/S2 becomes unstable (Ri < 0.25) within ~10 m of the TL upper boundary, suggesting that shear instability is active in the TL for zTL > 0. Ri is stable for zTL ≤ 0. Turbulent dissipation is found to scale exponentially with depth for zTL ≤ 0, but the decay scales are different for the TL and upper TC: ? scales well with either N2 or S2. Owing to the strong correlation between S2 and N2, existing TC scalings of the form ? ~ |S|p|N|q overpredict variations in ?. The scale dependence of shear variance is not found to significantly affect the scalings of ? versus N2 and S2 for zTL ≤ 0. However, the onset of unstable Ri at the top of the TL is sensitively dependent to the resolution of the shears.
    publisherAmerican Meteorological Society
    titleScaling Turbulent Dissipation in the Transition Layer
    typeJournal Paper
    journal volume43
    journal issue11
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-13-057.1
    journal fristpage2475
    journal lastpage2489
    treeJournal of Physical Oceanography:;2013:;Volume( 043 ):;issue: 011
    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
    yabeshDSpacePersian