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    On the Effects of Horizontal Resolution in a Limited-Area Model of the Gulf Stream System

    Source: Journal of Physical Oceanography:;1993:;Volume( 023 ):;issue: 005::page 1001
    Author:
    Schmitz, William J.
    ,
    Thompson, J. Dana
    DOI: 10.1175/1520-0485(1993)023<1001:OTEOHR>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: An adiabatic, primitive equation, eddy-resolving circulation model has been applied to the Gulf Stream System from Cape Hatteras to east of the Grand Banks (30°?48°N, 78°?45°W). A two-layer version of the model was driven both by direct wind forcing and by transport prescribed at inflow ports south of Cape Hatteras for the Gulf Stream and near the Grand Banks of Newfoundland for the deep western boundary current. The mean upper-layer thickness was sufficiently large for interface outcropping not to occur. Numerical experiments previously run at 0.2° horizontal resolution (?20 km) had some realistic features, but a key unresolved deficiency was that the highest eddy kinetic energies obtained near the Gulf Stream were too low relative to data by a factor of about 2, with inadequate eastward penetration. A unique set of new numerical experiments has extended previous results to higher horizontal resolution, all other conditions being held fixed. At 0.1° horizontal resolution, eddy kinetic energies in the vicinity of the Gulf Stream realistically increase by a factor of roughly 2 relative to 0.2°. The increase in eddy activity is a result of enhanced energy conversion from mean flow to fluctuations due to barotropic and baroclinic instabilities, with the nature of the instability mixture as well as eddy energy changing with increased resolution. One experiment at 0.05° horizontal resolution (?5 km) yielded kinetic energies and key energy transfer terms that are within 10% of the equivalent 0.1° case, suggesting that convergence of the numerical solutions has nearly been reached.
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      On the Effects of Horizontal Resolution in a Limited-Area Model of the Gulf Stream System

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    contributor authorSchmitz, William J.
    contributor authorThompson, J. Dana
    date accessioned2017-06-09T14:50:41Z
    date available2017-06-09T14:50:41Z
    date copyright1993/05/01
    date issued1993
    identifier issn0022-3670
    identifier otherams-28024.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4165095
    description abstractAn adiabatic, primitive equation, eddy-resolving circulation model has been applied to the Gulf Stream System from Cape Hatteras to east of the Grand Banks (30°?48°N, 78°?45°W). A two-layer version of the model was driven both by direct wind forcing and by transport prescribed at inflow ports south of Cape Hatteras for the Gulf Stream and near the Grand Banks of Newfoundland for the deep western boundary current. The mean upper-layer thickness was sufficiently large for interface outcropping not to occur. Numerical experiments previously run at 0.2° horizontal resolution (?20 km) had some realistic features, but a key unresolved deficiency was that the highest eddy kinetic energies obtained near the Gulf Stream were too low relative to data by a factor of about 2, with inadequate eastward penetration. A unique set of new numerical experiments has extended previous results to higher horizontal resolution, all other conditions being held fixed. At 0.1° horizontal resolution, eddy kinetic energies in the vicinity of the Gulf Stream realistically increase by a factor of roughly 2 relative to 0.2°. The increase in eddy activity is a result of enhanced energy conversion from mean flow to fluctuations due to barotropic and baroclinic instabilities, with the nature of the instability mixture as well as eddy energy changing with increased resolution. One experiment at 0.05° horizontal resolution (?5 km) yielded kinetic energies and key energy transfer terms that are within 10% of the equivalent 0.1° case, suggesting that convergence of the numerical solutions has nearly been reached.
    publisherAmerican Meteorological Society
    titleOn the Effects of Horizontal Resolution in a Limited-Area Model of the Gulf Stream System
    typeJournal Paper
    journal volume23
    journal issue5
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1993)023<1001:OTEOHR>2.0.CO;2
    journal fristpage1001
    journal lastpage1007
    treeJournal of Physical Oceanography:;1993:;Volume( 023 ):;issue: 005
    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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