Reduction of near-inertial energy through the dependence of wind stress on the ocean-surface velocity
Reduction of near-inertial energy through the dependence of wind stress on the ocean-surface velocity
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DOI：
10.1002/jgrc.20198
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发表时间：
2013-06
期刊：
影响因子：
--
通讯作者：
W. Rath;R. Greatbatch;Xiaoming Zhai
中科院分区：
文献类型：
--
作者：
W. Rath;R. Greatbatch;Xiaoming Zhai
利用一个真实的涡旋空间分辨率的南大洋原始方程模式，研究了海面风应力对近惯性振荡强度的影响。考虑到风应力对海面风速的依赖性，风引起的近惯性能大幅减少约40%，输入近惯性频段的风能减少约20%。如果计入海面风速，这种减少在很大程度上可以用风应力的先导阶修正来解释。减少的强度受海面混合层深度的反转所调制。我们的结论是，在估计输入到近惯性频段的风功率时，以及在估计由于风强迫而产生的海洋近惯性能级时，应考虑风应力的表面速度依赖性的影响。
A realistic primitive-equation model of the Southern Ocean at eddying spatial resolution is used to examine the effect of ocean-surface-velocity dependence of the wind stress on the strength of near-inertial oscillations. Accounting for the ocean-surface-velocity dependence of the wind stress leads to a large reduction of wind-induced near-inertial energy of approximately 40 percent and of wind power input into the near-inertial frequency band of approximately 20 percent. A large part of this reduction can be explained by the leading-order modification to the wind stress if the ocean-surface velocity is included. The strength of the reduction is shown to be modulated by the inverse of the ocean-surface-mixed-layer depth. We conclude that the effect of surface-velocity dependence of the wind stress should be taken into account when estimating the wind-power input into the near-inertial frequency band and when estimating near-inertial energy levels in the ocean due to wind forcing.