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首页> 外文期刊>Journal of Physical Oceanography >Sensitivity of Pacific Ocean Tropical Instability Waves to Initial Conditions
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Sensitivity of Pacific Ocean Tropical Instability Waves to Initial Conditions

机译：太平洋热带不稳定波对初始条件的敏感性

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摘要

Tropical instability waves (TIWs) appear as monthly oscillations of the currents, sea level, and sea surface temperature of the eastern equatorial Pacific. They are understood as unstable waves feeding on the kinetic and potential energy of the mean currents. A general circulation model is shown to reproduce the main features associated with TIWs. It is then used to investigate the dynamical regime of TIWs, by assessing their sensitivity to oceanic initial conditions. Locally in space and time, small perturbations can grow enough to modify significantly the phase of the TIW field, suggesting some chaotic behavior. When considered over the whole active TIW region, however, the phases of the perturbed and unperturbed experiments remain in agreement. This suggests that TIW activity in this model is more consistent with a limit cycle behavior than with fully developed turbulence and that irregular behavior of TIWs mostly stems from external forcing by the wind. A stronger result is that TIWs in experiments starting from very different initial conditions come back into phase after a few years. This is consistent with the suggestion that TIWs might be phase-locked to the wind forcing. Quiescent periods of the TIW's cycle play an important role in the decay of TIW's phase disagreement but cannot explain the phase-locking mechanism entirely. The implications of these results and their sensitivity to the forcing are discussed.
机译：热带不稳定波（TIW）表现为赤道东太平洋洋流，海平面和海面温度的月度振荡。它们被理解为以平均电流的动能和势能为食的不稳定波。展示了一个通用的循环模型来重现与TIW相关的主要特征。然后，通过评估TIW对海洋初始条件的敏感性，将其用于研究TIW的动力机制。在空间和时间上，小的扰动可能会增长到足以显着改变TIW场的相位，表明有些混沌行为。但是，当在整个活动TIW区域中考虑时，扰动和不扰动实验的阶段仍保持一致。这表明与完全发展的湍流相比，该模型中的TIW活动与极限循环行为更加一致，并且TIW的不规则行为主要源于风的外部强迫。一个更强有力的结果是，从非常不同的初始条件开始的实验中的TIW在几年后又恢复了阶段。这与TIW可能被锁在风中的建议是一致的。 TIW周期的静止期在TIW相位不一致的衰减中起重要作用，但不能完全解释锁相机制。讨论了这些结果的含义及其对强迫的敏感性。

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