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继第部分之后研究了惯性内波和近惯性内波由f～的作用所致的剪切不稳定引起的破碎机制。物理上,该机制很象存在由风应力所致薄表面涡旋漂流层时表面波的破碎与饱和过程。惯性内波和近惯性内波的破碎产物与小尺度湍流一起形成了混合块,它与Gregg等人(1986)的持久混合观测结果一致。依据Thorpe(1973)实验的结果作者提出了一个估计湍流动能耗散率和消衰时间的方法。结果表明,在剪切不稳定中近惯性内波在湍动耗散中起了关键作用,而惯性内波引起非常弱的湍动耗散。使用内波能量谱的标准总能量密度估计出的近惯性内波的耗散率和消衰时间与PATCHEX测量结果非常一致。文中还讨论了几个与此破碎机制有关的问题。
Following the first part, we study the crushing mechanism caused by the shear instability caused by the internal friction of inertial internal waves and near inertial internal waves. Physically, this mechanism is much like the process of surface wave breaking and saturation when there is a thin surface vortex drift due to wind stress. The crushed products of inertial and near-inertial internal waves together with small-scale turbulence form a mixed mass that is consistent with the long-lasting mixed observations of Gregg et al. (1986). Based on the results of the Thorpe (1973) experiment, the authors propose a method to estimate the turbulent kinetic energy dissipation rate and the decay time. The results show that near-inertial internal waves play a key role in turbulent dissipation during shear instability, whereas inertial internal waves cause very weak turbulent dissipation. The estimated near total inertial internal wave dissipation rate and decay time using the standard total energy density of the internal wave energy spectrum are in good agreement with the PATCHEX measurements. The article also discusses several issues related to this crushing mechanism.