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Anomalous Upper-Ocean Circulation of the Western Equatorial Pacific following El Nino Events

机译：El Nino活动之后西赤道太平洋的异常高海洋循环

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摘要

Mooring measurements at ~140°E in the western equatorial Pacific Ocean documented greatly intensified eastward subsurface currents, which largely represent the nascent Equatorial Undercurrent, to ~67cms' in boreal summer of 2016. The eastward currents occupied the entire upper 500 m while the westward surface currents nearly disappeared. Historical in situ data observed similar variations after most El Nino events. Further analysis combining satellite and reanalysis data reveals that the eastward currents observed at ~140°E are a component of an anomalous counterclockwise circulation straddling the equator, with westward current anomalies retroflecting near the western boundary and feeding southeastward current anomalies along the New Guinea coast. A 1.5-layer reduced-gravity ocean model is able to crudely reproduce these variations, and a hierarchy of sensitivity experiments is performed to understand the underlying dynamics. The anomalous circulation is largely the delayed ocean response to equatorial wind anomalies over the central-to-eastem Pacific basin emerging in the mature stage of El Nino. Downwelling Rossby waves are generated by the reflection of equatorial Kelvin waves and easterly winds in the eastern Pacific. Upon reaching the western Pacific, the southern lobes of Rossby waves encounter the slanted New Guinea island and deflect to the equator, establishing a local sea surface height maximum and leading to the detour of westward currents flowing from the Pacific interior. Additional experiments with edited western boundary geometry confirm the importance of topography in regulating the structure of this cross-equatorial anomalous circulation.
机译：在西赤道太平洋〜140°E中系泊测量记录了大大加强的东部地下电流，这主要代表2016年北夏季的新生赤道暗流，〜67cms'。东风占据了整个上部500米，虽然向西表面电流几乎消失了。历史原位数据观察到大多数EL NINO事件后的类似变化。进一步的分析结合卫星和再分析数据表明，在〜140°E中观察到的向后电流是横跨赤道的异常逆时针循环的组分，随着西部边界附近的向西电流异常重新选择，沿着新几内亚海岸喂养东南电流异常。 1.5层减小的重力海洋模型能够粗略地再现这些变化，并进行敏感性实验的层次，以了解潜在的动态。异常循环主要是在El Nino成熟阶段的中央到央行盆地中赤道风异常的延迟海洋反应。沉船罗斯比波是由东太平洋东部的赤道开尔文波和东风的反射产生的。达到西太平洋后，罗斯比波的南方裂片遭遇倾斜的新几内亚岛，并偏转到赤道，建立当地海面高度最大，导致从太平洋内部流动的向西电流绕道。编辑的西部边界几何形状的额外实验证实了地形在调节这种交叉赤道异常循环结构方面的重要性。

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  • 来源
    《Journal of Physical Oceanography》 |2020年第11期|3353-3373|共21页
  • 作者

    YILONG LYU; YUANLONG LI; JIANING WANG; JING DUAN; XIAOHUI TANG; CHUANYU LIU; LINLIN ZHANG; QIANG MA; FAN WANG;

  • 作者单位

    CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao China Function Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao China;

    CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao China Function Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao China;

    CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao China Function Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao China;

    CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao China Function Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao China;

    CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao China Function Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao China;

    CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao China Function Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao China;

    CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao China Function Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao China;

    CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao China Function Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao China;

    CAS Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao China Function Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao China University of Chinese Academy of Sciences Beijing China;

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  • 正文语种 eng
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  • 关键词

    Ocean circulation; Atmosphere-ocean interaction; ENSO; Warm pool; Interannual variability;

    机译：海洋循环;气氛 - 海洋互动;enso;温池;年平变形;

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