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Dynamics on Seasonal Variability of EKE Associated with TIWs in the Eastern Equatorial Pacific Ocean

机译：东部赤道太平洋与TIWS季节性变异性的动态

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摘要

Energetic mesoscale eddies (vortices) associated with tropical instability waves (TIWs) exist in the eastern equatorial Pacific Ocean between 0 degrees and 8 degrees N. This study examines the seasonal variations in eddy kinetic energy (EKE) of TIWs using in situ and satellite observations and elucidates the underlying dynamical mechanisms. The results reveal that the cross-equatorial southerly winds are key to sustaining the high-level EKE (up to similar to 600 cm(2) s(-2)) from boreal summer to winter in 0 degrees-6 degrees N and 155 degrees-110 degrees W. Because of the beta effect and the surface wind divergence, the southerly winds generate anticyclonic wind curls north of the equator that intensify the sea surface temperature (SST) fronts and force the downwelling annual Rossby waves. The resultant sea surface height ridge induces strong horizontal current shears between 0 degrees and 5 degrees N. The intensified current shears and SST fronts generate EKE via barotropic and baroclinic instabilities, respectively. To the extent that the seasonal migration of a northward-displaced intertropical convergence zone intensifies the southerly winds north of, but not south of, the equator, our study suggests that the climatic asymmetry is important for the oceanic eddy generations in the eastern equatorial Pacific Ocean-a result with important implications for coupled climate simulation/prediction.
机译：与热带不稳定波（TIWS）相关的精力充沛的Messcale eddies（涡旋）在0度和8摄氏度之间的东部赤道太平洋中存在。本研究审查了使用原位和卫星观测的TIWS涡旋能量（EKE）的季节变化并阐明潜在的动态机制。结果表明，跨赤道南风风吹的是从北方夏天到冬季到冬季到冬季的高级EKE（高达600cm（2）秒）的关键，在0摄氏度-6度N和155度-110华氏度W.由于β效应和表面风分散，南部风产生北方的北方北部的反气旋风卷发，从而强化海面温度（SST）前线并强制沉船年度罗斯比波。得到的海面高度脊诱导0度和5摄氏度之间的强水平电流剪切。强化电流剪切和SST前沿分别通过波管和曲金型稳定性产生EKE。在北方流离失所者的季节性迁移的范围内，我们的研究表明，我们的研究表明，我们的研究表明，我们的研究表明气候不对称对东赤道太平洋的海洋涡流是重要的 - 对于耦合气候模拟/预测的重要意义。

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  • 来源
    《Journal of Physical Oceanography》 |2019年第6期|1503-1519|共17页
  • 作者

    Wang Minyang; Du Yan; Qui Bo; Xie Shang-Ping; Feng Ming;

  • 作者单位

    Univ Chinese Acad Sci State Key Lab Trop Oceanog South China Sea Inst Oceanol Beijing Peoples R China;

    Univ Chinese Acad Sci State Key Lab Trop Oceanog South China Sea Inst Oceanol Beijing Peoples R China;

    Univ Hawaii Manoa Dept Oceanog Honolulu HI 96822 USA;

    Univ Calif San Diego Scripps Inst Oceanog La Jolla CA 92093 USA|Ocean Univ China Phys Oceanog Lab CIMST Qingdao Shandong Peoples R China|Natl Lab Marine Sci & Technol Qingdao Shandong Peoples R China;

    CSIRO Oceans & Atmosphere Crawley WA Australia;

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