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首页> 外文期刊>Journal of Physical Oceanography >Tropical Cells and a Secondary Circulation near the Northern Front of the Equatorial Pacific Cold Tongue
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Tropical Cells and a Secondary Circulation near the Northern Front of the Equatorial Pacific Cold Tongue

机译：赤道太平洋冷舌北缘附近的热带细胞和次级循环

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摘要

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.
机译：船上测量值和模型用于描述赤道中部太平洋的子午-垂直热带细胞（TC）的平均结构以及与冷舌北端相关的二次循环。热带不稳定波（TIW）的通过使前部的形状变得复杂。在以北锋瞬时位置为中心的坐标系中对速度进行平均时，测量结果表明，在表面锋以北的北向流（靠近锋面的会聚流）中，近地表最小值。这种会聚和推断的下涌在地表混合层之下延伸，随着深度向极极倾斜，并在子午线上由发散和上涌的区域界定。类似地，该模型表明，平均而言，地表冷舌水向北移动至额叶区域并在倾斜的前部下方潜水，而前部北部的地下水则向南移动至前部，向上上升，然后在表面混合层中向北移动。 。该模型用于证明这种准绝热二次循环不是随锋移动的冻结场，而是高度依赖于TIW的相位：在锋的暖侧向南向上流动倾向于发生当前部向南移动时，而当前部向北移动时，则在前部冷侧向北向下流动。因此，在地理坐标上平均时，观察到的和模拟的TCs看起来是赤道不对称的，并且在平均前沿附近几乎没有二次循环的痕迹。

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  • 来源
    《Journal of Physical Oceanography》 |2010年第9期|P.2091-2106|共16页
  • 作者

    Renellys C. Perez; Meghan F. Cronin; William S. Kessler;

  • 作者单位

    Cooperative Institute for Marine and Atmospheric Studies, University of Miami, and National Oceanic and Atmospheric Administration /Atlantic Oceanographic and Meteorological Laboratory, Miami, Florida;

    rnNational Oceanic and Atmospheric Administration/Pacific Marine Environmental Laboratory, Seattle, Washington;

    rnNational Oceanic and Atmospheric Administration/Pacific Marine Environmental Laboratory, Seattle, Washington;

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