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    Time Scales of Southern Ocean Eddy Equilibration

    Source: Journal of Physical Oceanography:;2016:;Volume( 046 ):;issue: 009::page 2785
    Author:
    Sinha, Anirban
    ,
    Abernathey, Ryan P.
    DOI: 10.1175/JPO-D-16-0041.1
    Publisher: American Meteorological Society
    Abstract: tratification in the Southern Ocean is determined primarily by a competition between westerly wind-driven upwelling and baroclinic eddy transport. This study investigates the time scales of equilibration of the Southern Ocean in response to changing winds through an idealized channel model. An analytical framework describing the energetic pathways between wind input, available potential energy (APE), eddy kinetic energy (EKE), and dissipation provides a simple theory of the phase and amplitude response to oscillating wind stress. The transient ocean response to variable winds lies between the two limits of Ekman response (high frequency), characterized by the isopycnal slope responding directly to wind stress, and ?eddy saturation? (low frequency), wherein a large fraction of the anomalous wind work goes into mesoscale eddies. The crossover time scale is the time scale of meridional eddy diffusive transport across the Antarctic Circumpolar Current (ACC) front. For wind variability with a period of 3 months (high-frequency forcing), the relative conversion of wind work to APE/EKE is 11, while for a period of 16 years (low-frequency forcing), the relative conversion to APE/EKE reduces to 3. The system?s frequency response is characterized by a complex transfer function. Both the phase and amplitude response of EKE and APE predicted by the linear analytic framework are verified using multiple ensemble experiments in an eddy-resolving (4-km horizontal resolution) isopycnal coordinate model. The results from the numerical experiments show agreement with the linear theory and can be used to explain certain features observed in previous modeling studies and observations.
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      Time Scales of Southern Ocean Eddy Equilibration

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    contributor authorSinha, Anirban
    contributor authorAbernathey, Ryan P.
    date accessioned2017-06-09T17:22:02Z
    date available2017-06-09T17:22:02Z
    date copyright2016/09/01
    date issued2016
    identifier issn0022-3670
    identifier otherams-83903.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4227180
    description abstracttratification in the Southern Ocean is determined primarily by a competition between westerly wind-driven upwelling and baroclinic eddy transport. This study investigates the time scales of equilibration of the Southern Ocean in response to changing winds through an idealized channel model. An analytical framework describing the energetic pathways between wind input, available potential energy (APE), eddy kinetic energy (EKE), and dissipation provides a simple theory of the phase and amplitude response to oscillating wind stress. The transient ocean response to variable winds lies between the two limits of Ekman response (high frequency), characterized by the isopycnal slope responding directly to wind stress, and ?eddy saturation? (low frequency), wherein a large fraction of the anomalous wind work goes into mesoscale eddies. The crossover time scale is the time scale of meridional eddy diffusive transport across the Antarctic Circumpolar Current (ACC) front. For wind variability with a period of 3 months (high-frequency forcing), the relative conversion of wind work to APE/EKE is 11, while for a period of 16 years (low-frequency forcing), the relative conversion to APE/EKE reduces to 3. The system?s frequency response is characterized by a complex transfer function. Both the phase and amplitude response of EKE and APE predicted by the linear analytic framework are verified using multiple ensemble experiments in an eddy-resolving (4-km horizontal resolution) isopycnal coordinate model. The results from the numerical experiments show agreement with the linear theory and can be used to explain certain features observed in previous modeling studies and observations.
    publisherAmerican Meteorological Society
    titleTime Scales of Southern Ocean Eddy Equilibration
    typeJournal Paper
    journal volume46
    journal issue9
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-16-0041.1
    journal fristpage2785
    journal lastpage2805
    treeJournal of Physical Oceanography:;2016:;Volume( 046 ):;issue: 009
    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
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