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首页> 外文期刊>Journal of Physical Oceanography >Intermediate Zonal Jets in the Tropical Pacific Ocean Observed by Argo Floats
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Intermediate Zonal Jets in the Tropical Pacific Ocean Observed by Argo Floats

机译：Argo Floats观测到的热带太平洋中级地带喷气机

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摘要

Argo float data in the tropical Pacific Ocean during January 2003-August 2011 are analyzed to obtain Lagrangian subsurface velocities at their parking depths. Maps of mean zonal velocities at 1000 and 1500 m are presented. At both depths, a series of alternating westward and eastward zonal jets with a meridional scale of 1.5° is seen at the basin scale from 10cS to 10°N. These alternating jets, with mean speeds about 5 cm s~(-1) are clearly present in the western and central parts of the basin but weaken and disappear approaching the eastern coast. They are stronger in the Southern Hemisphere. Along the equator at both 1000 and 1500 m, a westward jet is seen. The jets closer to the equator are remarkably zonally coherent across the basin, but the jets farther poleward appear broken in several segments. In the western half of the basin, the 1000-m zonal jets appear to slant slightly poleward from east to west. At the western boundary in the south (east of Solomon Islands and Papua New Guinea), the alternating jets appear to connect in narrow boundary currents. Seasonal zonal velocity anomalies at 1000 and 1500 m are observed to propagate westward across the basin; they are consistent with annual vertically propagating Rossby waves superimposed on the mean zonal jets. Their meridional structure suggests that more than one meridional mode is present.
机译：分析了2003年1月至2011年8月热带太平洋中的Argo漂浮物数据，以求得它们停泊深度处的拉格朗日地下速度。给出了在1000和1500 m处的平均纬向速度图。在两个深度上，在从10cS到10°N的盆地尺度上都可以看到一系列经向西向东交替的纬向射流，子午尺度为1.5°。这些交替喷流的平均速度约为5 cm s〜（-1）清楚地出现在盆地的中部和西部，但在靠近东部海岸时减弱并消失。他们在南半球更强大。沿着赤道分别在1000和1500 m处，可以看到向西的喷流。距赤道较近的射流在整个盆地上具有明显的纬向连贯性，但向极远的射流在几段中表现为断裂。在盆地的西半部，从东到西，1000 m的纬向射流似乎略有偏极。在南部的西部边界（所罗门群岛和巴布亚新几内亚的东部），交替的喷流似乎在狭窄的边界流中连接。观测到在1000和1500 m处的季节性纬向速度异常在整个盆地向西传播。它们与叠加在平均纬向射流上的逐年垂直传播的Rossby波一致。它们的子午线结构表明存在多个子午线模式。

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  • 来源
    《Journal of Physical Oceanography》 |2012年第9期|p.1475-1485|共11页
  • 作者

    Sophie Cravatte; William S. Kessler; Frederic Marin;

  • 作者单位

    LEGOS, Universite de Toulouse (OMP-PCA)/IRD/CNRS/CNES, and Institut de Recherche pour le Developpement, LEGOS, Toulouse, France;

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

    LEGOS, Universite de Toulouse (OMP-PCA)/IRD/CNRS/CNES, Toulouse, France, and Institut de Recherche pour le Developpement, LEGOS, Noumea, New Caledonia;

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