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    Tropical Cells and a Secondary Circulation near the Northern Front of the Equatorial Pacific Cold Tongue

    Source: Journal of Physical Oceanography:;2010:;Volume( 040 ):;issue: 009::page 2091
    Author:
    Perez, Renellys C.
    ,
    Cronin, Meghan F.
    ,
    Kessler, William S.
    DOI: 10.1175/2010JPO4366.1
    Publisher: American Meteorological Society
    Abstract: Shipboard measurements and a model are used to describe the mean structure of meridional?vertical tropical cells (TCs) in the central equatorial Pacific and a secondary circulation associated with the northern front of the cold tongue. The shape of the front is convoluted by the passage of tropical instability waves (TIWs). When velocities are averaged in a coordinate system centered on the instantaneous position of the northern front, the measurements show a near-surface minimum in northward flow north of the surface front (convergent flow near the front). This convergence and inferred downwelling extend below the surface mixed layer, tilt poleward with depth, and are meridionally bounded by regions of divergence and upwelling. Similarly, the model shows that, on average, surface cold tongue water moves northward toward the frontal region and dives below tilted front, whereas subsurface water north of the front moves southward toward the front, upwells, and then moves northward in the surface mixed layer. The model is used to demonstrate that this mean quasi-adiabatic secondary circulation is not a frozen field that migrates with the front but is instead highly dependent on the phase of the TIWs: southward-upwelling flow on the warm side of the front tends to occur when the front is displaced southward, whereas northward-downwelling flow on the cold side of the front occurs when the front is displaced northward. Consequently, when averaged in geographic coordinates, the observed and simulated TCs appear to be equatorially asymmetric and show little trace of a secondary circulation near the mean front.
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      Tropical Cells and a Secondary Circulation near the Northern Front of the Equatorial Pacific Cold Tongue

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    contributor authorPerez, Renellys C.
    contributor authorCronin, Meghan F.
    contributor authorKessler, William S.
    date accessioned2017-06-09T16:36:51Z
    date available2017-06-09T16:36:51Z
    date copyright2010/09/01
    date issued2010
    identifier issn0022-3670
    identifier otherams-70946.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4212783
    description abstractShipboard measurements and a model are used to describe the mean structure of meridional?vertical tropical cells (TCs) in the central equatorial Pacific and a secondary circulation associated with the northern front of the cold tongue. The shape of the front is convoluted by the passage of tropical instability waves (TIWs). When velocities are averaged in a coordinate system centered on the instantaneous position of the northern front, the measurements show a near-surface minimum in northward flow north of the surface front (convergent flow near the front). This convergence and inferred downwelling extend below the surface mixed layer, tilt poleward with depth, and are meridionally bounded by regions of divergence and upwelling. Similarly, the model shows that, on average, surface cold tongue water moves northward toward the frontal region and dives below tilted front, whereas subsurface water north of the front moves southward toward the front, upwells, and then moves northward in the surface mixed layer. The model is used to demonstrate that this mean quasi-adiabatic secondary circulation is not a frozen field that migrates with the front but is instead highly dependent on the phase of the TIWs: southward-upwelling flow on the warm side of the front tends to occur when the front is displaced southward, whereas northward-downwelling flow on the cold side of the front occurs when the front is displaced northward. Consequently, when averaged in geographic coordinates, the observed and simulated TCs appear to be equatorially asymmetric and show little trace of a secondary circulation near the mean front.
    publisherAmerican Meteorological Society
    titleTropical Cells and a Secondary Circulation near the Northern Front of the Equatorial Pacific Cold Tongue
    typeJournal Paper
    journal volume40
    journal issue9
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/2010JPO4366.1
    journal fristpage2091
    journal lastpage2106
    treeJournal of Physical Oceanography:;2010:;Volume( 040 ):;issue: 009
    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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