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首页> 外文期刊>Journal of Physical Oceanography >Dynamics on Seasonal Variability of EKE Associated with TIWs in the Eastern Equatorial Pacific Ocean
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Dynamics on Seasonal Variability of EKE Associated with TIWs in the Eastern Equatorial Pacific Ocean

机译：赤道东太平洋EKE与TIW相关的季节变化动态

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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（TIW）相关的高能中尺度涡（涡旋）存在于赤道东太平洋0度至8度之间。本研究使用原位和卫星观测资料研究了TIW的涡动能（EKE）的季节性变化。并阐明了潜在的动力机制。结果表明，从赤道夏季到冬季，在0度至6度N和155度，从北向赤道偏南风是维持高水平EKE（高达600 cm（2）s（-2）左右）的关键-110度。由于贝塔效应和表面风的发散性，南风向赤道以北产生反气旋风卷曲，从而加剧海面温度（SST）前沿，并迫使向下的年度Rossby波传播。由此产生的海面高度脊在0度和5度N之间引起强烈的水平电流剪切。增强的电流剪切和SST前沿分别通过正压和斜压不稳定性产生EKE。在某种程度上说，北移的热带辐合带的季节性迁移加剧了赤道以北而不是赤道以南的南风，我们的研究表明，气候不对称性对赤道东太平洋的海洋涡旋世代很重要。 -对气候模拟/预测耦合具有重要意义的结果。

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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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