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    Seasonal Transport Variations of the Kuroshio: An OGCM Simulation

    Source: Journal of Physical Oceanography:;1997:;Volume( 027 ):;issue: 003::page 403
    Author:
    Kagimoto, Takashi
    ,
    Yamagata, Toshio
    DOI: 10.1175/1520-0485(1997)027<0403:STVOTK>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Numerical simulation is performed using a high-resolution ocean general circulation model to investigate seasonal variations of the Kuroshio transport. The simulated velocity profiles of the Kuroshio agree surprisingly well with ADCP observations and dynamic calculations. The annual mean of the model Kuroshio transport relative to 700 m across the PN line near the Nansei (Ryukyu) Islands is about 25 Sv (Sv ≡ 106 m3 s?1), which is almost the same with the estimate based on the long-term hydrographic observations. The model transport variations across the PN line are also almost the same as the observation; the transport shows a weak maximum in summer and a weak minimum in winter. Although the Sverdrup balance is valid in the broad interior of the basin, it fails to predict the variations as well as the transport of the Kuroshio south of Japan due to existence of the Kuroshio recirculation. The above discrepancy between the Sverdrup theory and the model (observations, as well) is studied in detail by analyzing the torque balance. In winter the Kuroshio transport across the PN line is much smaller than expected from the Sverdrup theory because the topographic control prevents the western boundary current from intruding west of the continental slope near the Nansei Islands. The current over the slope region changes its direction from winter to summer due to anticyclonic eddy activity related to the joint effect of baroclinicity and bottom topography. The deep northeastward current over the slope in winter is canceled in summer by the eddy activity so that the interaction between the continental slope and the current is much reduced. Since the same eddy activity intensifies the Kuroshio recirculation, the Kuroshio transport across the PN line in the East China Sea is increased in summer. The present study demonstrates that comparing model results with observations requires a model resolution suitable enough to resolve locations of observations as well as essential dynamics related to the interaction between baroclinic ocean currents and bottom topography.
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      Seasonal Transport Variations of the Kuroshio: An OGCM Simulation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4165808
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    contributor authorKagimoto, Takashi
    contributor authorYamagata, Toshio
    date accessioned2017-06-09T14:52:28Z
    date available2017-06-09T14:52:28Z
    date copyright1997/03/01
    date issued1997
    identifier issn0022-3670
    identifier otherams-28667.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4165808
    description abstractNumerical simulation is performed using a high-resolution ocean general circulation model to investigate seasonal variations of the Kuroshio transport. The simulated velocity profiles of the Kuroshio agree surprisingly well with ADCP observations and dynamic calculations. The annual mean of the model Kuroshio transport relative to 700 m across the PN line near the Nansei (Ryukyu) Islands is about 25 Sv (Sv ≡ 106 m3 s?1), which is almost the same with the estimate based on the long-term hydrographic observations. The model transport variations across the PN line are also almost the same as the observation; the transport shows a weak maximum in summer and a weak minimum in winter. Although the Sverdrup balance is valid in the broad interior of the basin, it fails to predict the variations as well as the transport of the Kuroshio south of Japan due to existence of the Kuroshio recirculation. The above discrepancy between the Sverdrup theory and the model (observations, as well) is studied in detail by analyzing the torque balance. In winter the Kuroshio transport across the PN line is much smaller than expected from the Sverdrup theory because the topographic control prevents the western boundary current from intruding west of the continental slope near the Nansei Islands. The current over the slope region changes its direction from winter to summer due to anticyclonic eddy activity related to the joint effect of baroclinicity and bottom topography. The deep northeastward current over the slope in winter is canceled in summer by the eddy activity so that the interaction between the continental slope and the current is much reduced. Since the same eddy activity intensifies the Kuroshio recirculation, the Kuroshio transport across the PN line in the East China Sea is increased in summer. The present study demonstrates that comparing model results with observations requires a model resolution suitable enough to resolve locations of observations as well as essential dynamics related to the interaction between baroclinic ocean currents and bottom topography.
    publisherAmerican Meteorological Society
    titleSeasonal Transport Variations of the Kuroshio: An OGCM Simulation
    typeJournal Paper
    journal volume27
    journal issue3
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1997)027<0403:STVOTK>2.0.CO;2
    journal fristpage403
    journal lastpage418
    treeJournal of Physical Oceanography:;1997:;Volume( 027 ):;issue: 003
    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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