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    Ocean Convective Available Potential Energy. Part I: Concept and Calculation

    Source: Journal of Physical Oceanography:;2016:;Volume( 046 ):;issue: 004::page 1081
    Author:
    Su, Zhan
    ,
    Ingersoll, Andrew P.
    ,
    Stewart, Andrew L.
    ,
    Thompson, Andrew F.
    DOI: 10.1175/JPO-D-14-0155.1
    Publisher: American Meteorological Society
    Abstract: hermobaric convection (type II convection) and thermobaric cabbeling (type III convection) might substantially contribute to vertical mixing, vertical heat transport, and deep-water formation in the World Ocean. However, the extent of this contribution remains poorly constrained. The concept of ocean convective available potential energy (OCAPE), the thermobaric energy source for type II and type III convection, is introduced to improve the diagnosis and prediction of these convection events. OCAPE is analogous to atmospheric CAPE, which is a key energy source for atmospheric moist convection and has long been used to forecast moist convection. OCAPE is the potential energy (PE) stored in an ocean column arising from thermobaricity, defined as the difference between the PE of the ocean column and its minimum possible PE under adiabatic vertical parcel rearrangements. An ocean column may be stably stratified and still have nonzero OCAPE. The authors present an efficient strategy for computing OCAPE accurately for any given column of seawater. They further derive analytical expressions for OCAPE for approximately two-layer ocean columns that are widely observed in polar oceans. This elucidates the dependence of OCAPE on key physical parameters. Hydrographic profiles from the winter Weddell Sea are shown to contain OCAPE (0.001?0.01 J kg?1), and scaling analysis suggests that OCAPE may be substantially enhanced by wintertime surface buoyancy loss. The release of this OCAPE may substantially contribute to the kinetic energy of deep convection in polar oceans.
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      Ocean Convective Available Potential Energy. Part I: Concept and Calculation

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    contributor authorSu, Zhan
    contributor authorIngersoll, Andrew P.
    contributor authorStewart, Andrew L.
    contributor authorThompson, Andrew F.
    date accessioned2017-06-09T17:21:00Z
    date available2017-06-09T17:21:00Z
    date copyright2016/04/01
    date issued2016
    identifier issn0022-3670
    identifier otherams-83632.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226879
    description abstracthermobaric convection (type II convection) and thermobaric cabbeling (type III convection) might substantially contribute to vertical mixing, vertical heat transport, and deep-water formation in the World Ocean. However, the extent of this contribution remains poorly constrained. The concept of ocean convective available potential energy (OCAPE), the thermobaric energy source for type II and type III convection, is introduced to improve the diagnosis and prediction of these convection events. OCAPE is analogous to atmospheric CAPE, which is a key energy source for atmospheric moist convection and has long been used to forecast moist convection. OCAPE is the potential energy (PE) stored in an ocean column arising from thermobaricity, defined as the difference between the PE of the ocean column and its minimum possible PE under adiabatic vertical parcel rearrangements. An ocean column may be stably stratified and still have nonzero OCAPE. The authors present an efficient strategy for computing OCAPE accurately for any given column of seawater. They further derive analytical expressions for OCAPE for approximately two-layer ocean columns that are widely observed in polar oceans. This elucidates the dependence of OCAPE on key physical parameters. Hydrographic profiles from the winter Weddell Sea are shown to contain OCAPE (0.001?0.01 J kg?1), and scaling analysis suggests that OCAPE may be substantially enhanced by wintertime surface buoyancy loss. The release of this OCAPE may substantially contribute to the kinetic energy of deep convection in polar oceans.
    publisherAmerican Meteorological Society
    titleOcean Convective Available Potential Energy. Part I: Concept and Calculation
    typeJournal Paper
    journal volume46
    journal issue4
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-14-0155.1
    journal fristpage1081
    journal lastpage1096
    treeJournal of Physical Oceanography:;2016:;Volume( 046 ):;issue: 004
    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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