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    Freshening of Subsurface Waters in the Northwest Pacific Subtropical Gyre: Observations and Dynamics

    Source: Journal of Physical Oceanography:;2013:;Volume( 043 ):;issue: 012::page 2733
    Author:
    Yan, Youfang
    ,
    Chassignet, Eric P.
    ,
    Qi, Yiquan
    ,
    Dewar, William K.
    DOI: 10.1175/JPO-D-13-03.1
    Publisher: American Meteorological Society
    Abstract: ubsurface salinity anomalies propagating between mid- and low latitudes along isopycnal surfaces have been shown to play an important role in modulating ocean and climate variability. In this study, a sustained freshening and southwestward propagation of subsurface salinity anomalies in the northwest Pacific subtropical gyre and its dynamical mechanism are investigated using observations, numerical outputs, and a predictive model. Analyses of the observations show a pronounced subsurface freshening with salinity decreasing about 0.25 PSU near the 24.5-σ? surface in the northwest Pacific subtropical gyre during 2003?11. This freshening is found to be related to the surface forcing of salinity anomalies in the outcrop zone (25°?35°N, 130°?160°E). A predictive model based on the assumption of salinity conservation along the outcrop isopycnals is derived and used to examine this surface-forcing mechanism. The resemblance between the spatial structures of the subsurface salinity derived from the predictive model and from observations and numerical outputs suggests that subsurface salinity anomalies are ventilated over the outcrop zone. A salinity anomaly with an amplitude of about 0.25 PSU generated by the surface forcing is subducted in the outcrop zone and then propagates southwestward, accompanied by potential vorticity anomalies, to the east of Luzon Strait (~15°N) in roughly one year. When the anomalies reach 15°N, they turn and move gradually eastward toward the central Pacific, associated with an eastward countercurrent on the southern subtropical gyre.
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      Freshening of Subsurface Waters in the Northwest Pacific Subtropical Gyre: Observations and Dynamics

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    contributor authorYan, Youfang
    contributor authorChassignet, Eric P.
    contributor authorQi, Yiquan
    contributor authorDewar, William K.
    date accessioned2017-06-09T17:20:26Z
    date available2017-06-09T17:20:26Z
    date copyright2013/12/01
    date issued2013
    identifier issn0022-3670
    identifier otherams-83475.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226704
    description abstractubsurface salinity anomalies propagating between mid- and low latitudes along isopycnal surfaces have been shown to play an important role in modulating ocean and climate variability. In this study, a sustained freshening and southwestward propagation of subsurface salinity anomalies in the northwest Pacific subtropical gyre and its dynamical mechanism are investigated using observations, numerical outputs, and a predictive model. Analyses of the observations show a pronounced subsurface freshening with salinity decreasing about 0.25 PSU near the 24.5-σ? surface in the northwest Pacific subtropical gyre during 2003?11. This freshening is found to be related to the surface forcing of salinity anomalies in the outcrop zone (25°?35°N, 130°?160°E). A predictive model based on the assumption of salinity conservation along the outcrop isopycnals is derived and used to examine this surface-forcing mechanism. The resemblance between the spatial structures of the subsurface salinity derived from the predictive model and from observations and numerical outputs suggests that subsurface salinity anomalies are ventilated over the outcrop zone. A salinity anomaly with an amplitude of about 0.25 PSU generated by the surface forcing is subducted in the outcrop zone and then propagates southwestward, accompanied by potential vorticity anomalies, to the east of Luzon Strait (~15°N) in roughly one year. When the anomalies reach 15°N, they turn and move gradually eastward toward the central Pacific, associated with an eastward countercurrent on the southern subtropical gyre.
    publisherAmerican Meteorological Society
    titleFreshening of Subsurface Waters in the Northwest Pacific Subtropical Gyre: Observations and Dynamics
    typeJournal Paper
    journal volume43
    journal issue12
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-13-03.1
    journal fristpage2733
    journal lastpage2751
    treeJournal of Physical Oceanography:;2013:;Volume( 043 ):;issue: 012
    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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