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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Downward lee wave radiation from tropical instability waves in the central equatorial Pacific Ocean: A possible energy pathway to turbulent mixing
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Downward lee wave radiation from tropical instability waves in the central equatorial Pacific Ocean: A possible energy pathway to turbulent mixing

机译：来自赤道中部太平洋热带不稳定波的下风回波辐射：湍流混合的可能能量途径

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摘要

Turbulent mixing in the equatorial Pacific Ocean is an important process that controls diapycnal heat transport and hence affects the air-sea interactions and global climate. It is recently shown that, in the eastern equatorial Pacific, strong mixing is induced in the thermocline by enhanced vertical shear associated with tropical instability waves (TIWs), which propagate westward along the equator at a speed of ~0:5ms~(-1) with a wavelength of ~1000 km. In this study, using a high-resolution ocean general circulation model, we show that the TIWs can play an important role in inducing turbulent mixing in the thermocline also in the central equatorial Pacific, although the thermocline is too deep to be directly affected by the vertical shear of the TIWs. The front of the TIW is clearly manifested as a narrow strip of strong convergence of horizontal surface flow, from which area downward and westward propagating internal waves are intermittently emanated. These internal waves can be interpreted as lee waves generated by the surface-flow convergence zone, which acts like an inverted obstacle moving along the stratified ocean surface by inducing downward flow. The associated downward energy flux below the surface mixed layer increases as the TIW structure becomes deeper toward the central equatorial Pacific, so that the energy pathway to turbulent mixing in the thermocline can be created. The downward energy flux integrated over the entire equatorial Pacific and averaged during January 2011 amounts to ~8.1 GW, occupying a significant fraction of the energy input to the TIWs.
机译：赤道太平洋的湍流混合是控制辉热传热的重要过程，因此会影响海海相互作用和全球气候。最近的研究表明，在赤道东太平洋，与热带不稳定波（TIWs）有关的垂直切变增强，在温跃层中引起了强烈的混合作用，热带不稳定性波沿赤道向西传播的速度约为0：5ms〜（-1） ），波长约为1000公里。在这项研究中，我们使用高分辨率海洋总环流模型显示，TIWs在赤道中部太平洋的温跃层中也可在引起湍流混合中起重要作用，尽管该温跃层太深而不能直接受赤道太平洋影响。 TIW的垂直剪切。 TIW的前部清楚地表现为一条狭窄的条带，该条带很强地汇聚了水平面的水流，从该区域间歇地发出向下和向西传播的内波。这些内部波可以解释为由地表流汇聚区产生的回风，其作用像倒置的障碍物一样，通过诱导向下流动而沿着分层海洋表面移动。随着TIW结构向赤道中心太平洋越深，表面混合层下方的相关向下能量通量增加，从而可以建立通往温跃层湍流混合的能量路径。 2011年1月，整个赤道太平洋的平均下行能量通量约为8.1 GW，占TIW能量输入的很大一部分。

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