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    Decay of Turbulence in the Upper Ocean following Sudden Isolation from Surface Forcing

    Source: Journal of Physical Oceanography:;1997:;Volume( 027 ):;issue: 005::page 810
    Author:
    Smyth, W. D.
    ,
    Zavialov, P. O.
    ,
    Moum, J. N.
    DOI: 10.1175/1520-0485(1997)027<0810:DOTITU>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Measurements of velocity, hydrography, surface meteorology, and microstructure were made through several squall events during a westerly wind burst that occurred in the Western Pacific warm pool in December 1992. Sustained wind forcing generated a weakly stratified turbulent surface layer that extended to the top of the main thermocline. Following each rain event, freshwater formed a statically stable layer in the upper 4?12 m. The subsequent evolution of the mixing profile was strongly depth-dependent. Turbulence increased dramatically in the fresh layer adjacent to the surface but decreased in the underlying layer. The factor by which turbulence decreased following a given squall was strongly correlated with the net rainfall. The observed timescale for the decay of the turbulence was about 0.7 buoyancy periods, similar to decay times observed near the surface after sunrise. However, these decay times are significantly larger than those estimated indirectly (as the ratio of dissipation rate to turbulent kinetic energy) from turbulent patches in the thermocline. To account for the discrepancy, the authors hypothesize that turbulence production continues to act during the observed decay process, partially counteracting the effect of dissipation.
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      Decay of Turbulence in the Upper Ocean following Sudden Isolation from Surface Forcing

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4165839
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    contributor authorSmyth, W. D.
    contributor authorZavialov, P. O.
    contributor authorMoum, J. N.
    date accessioned2017-06-09T14:52:32Z
    date available2017-06-09T14:52:32Z
    date copyright1997/05/01
    date issued1997
    identifier issn0022-3670
    identifier otherams-28695.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4165839
    description abstractMeasurements of velocity, hydrography, surface meteorology, and microstructure were made through several squall events during a westerly wind burst that occurred in the Western Pacific warm pool in December 1992. Sustained wind forcing generated a weakly stratified turbulent surface layer that extended to the top of the main thermocline. Following each rain event, freshwater formed a statically stable layer in the upper 4?12 m. The subsequent evolution of the mixing profile was strongly depth-dependent. Turbulence increased dramatically in the fresh layer adjacent to the surface but decreased in the underlying layer. The factor by which turbulence decreased following a given squall was strongly correlated with the net rainfall. The observed timescale for the decay of the turbulence was about 0.7 buoyancy periods, similar to decay times observed near the surface after sunrise. However, these decay times are significantly larger than those estimated indirectly (as the ratio of dissipation rate to turbulent kinetic energy) from turbulent patches in the thermocline. To account for the discrepancy, the authors hypothesize that turbulence production continues to act during the observed decay process, partially counteracting the effect of dissipation.
    publisherAmerican Meteorological Society
    titleDecay of Turbulence in the Upper Ocean following Sudden Isolation from Surface Forcing
    typeJournal Paper
    journal volume27
    journal issue5
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1997)027<0810:DOTITU>2.0.CO;2
    journal fristpage810
    journal lastpage822
    treeJournal of Physical Oceanography:;1997:;Volume( 027 ):;issue: 005
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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