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    Interannual Variability of the North Pacific Subtropical Countercurrent and Its Associated Mesoscale Eddy Field

    Source: Journal of Physical Oceanography:;2010:;Volume( 040 ):;issue: 001::page 213
    Author:
    Qiu, Bo
    ,
    Chen, Shuiming
    DOI: 10.1175/2009JPO4285.1
    Publisher: American Meteorological Society
    Abstract: Interannual changes in the mesoscale eddy field along the Subtropical Countercurrent (STCC) band of 18°?25°N in the western North Pacific Ocean are investigated with 16 yr of satellite altimeter data. Enhanced eddy activities were observed in 1996?98 and 2003?08, whereas the eddy activities were below average in 1993?95 and 1999?2002. Analysis of repeat hydrographic data along 137°E reveals that the vertical shear between the surface eastward-flowing STCC and the subsurface westward-flowing North Equatorial Current (NEC) was larger in the eddy-rich years than in the eddy-weak years. By adopting a 2½-layer reduced-gravity model, it is shown that the increased eddy kinetic energy level in 1996?98 and 2003?08 is because of enhanced baroclinic instability resulting from the larger vertical shear in the STCC?NEC?s background flow. The cause for the STCC?NEC?s interannually varying vertical shear can be sought in the forcing by surface Ekman temperature gradient convergence within the STCC band. Rather than El Niño?Southern Oscillation signals as previously hypothesized, interannual changes in this Ekman forcing field, and hence the STCC?NEC?s vertical shear, are more related to the negative western Pacific index signals.
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      Interannual Variability of the North Pacific Subtropical Countercurrent and Its Associated Mesoscale Eddy Field

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    contributor authorQiu, Bo
    contributor authorChen, Shuiming
    date accessioned2017-06-09T16:31:01Z
    date available2017-06-09T16:31:01Z
    date copyright2010/01/01
    date issued2010
    identifier issn0022-3670
    identifier otherams-69251.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4210899
    description abstractInterannual changes in the mesoscale eddy field along the Subtropical Countercurrent (STCC) band of 18°?25°N in the western North Pacific Ocean are investigated with 16 yr of satellite altimeter data. Enhanced eddy activities were observed in 1996?98 and 2003?08, whereas the eddy activities were below average in 1993?95 and 1999?2002. Analysis of repeat hydrographic data along 137°E reveals that the vertical shear between the surface eastward-flowing STCC and the subsurface westward-flowing North Equatorial Current (NEC) was larger in the eddy-rich years than in the eddy-weak years. By adopting a 2½-layer reduced-gravity model, it is shown that the increased eddy kinetic energy level in 1996?98 and 2003?08 is because of enhanced baroclinic instability resulting from the larger vertical shear in the STCC?NEC?s background flow. The cause for the STCC?NEC?s interannually varying vertical shear can be sought in the forcing by surface Ekman temperature gradient convergence within the STCC band. Rather than El Niño?Southern Oscillation signals as previously hypothesized, interannual changes in this Ekman forcing field, and hence the STCC?NEC?s vertical shear, are more related to the negative western Pacific index signals.
    publisherAmerican Meteorological Society
    titleInterannual Variability of the North Pacific Subtropical Countercurrent and Its Associated Mesoscale Eddy Field
    typeJournal Paper
    journal volume40
    journal issue1
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/2009JPO4285.1
    journal fristpage213
    journal lastpage225
    treeJournal of Physical Oceanography:;2010:;Volume( 040 ):;issue: 001
    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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