Vortical and Internal Wave Shear and Strain
Vortical and Internal Wave Shear and Strain
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涡流和内波剪切和应变
DOI：
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发表时间：
2014
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通讯作者：
R. Pinkel
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作者：
R. Pinkel
摘要在研究平台（R/P）浮动仪器平台（FLIP）上，利用密集的CTD剖面程序收集了等向垂直应变的深时记录。应变的垂直波数相关频谱，在等距跟随帧中观察时，在低垂直波数处显示出明显的频谱间隙，将准等转（涡旋）应变场与超惯性内波连续体分开。这种差距使得基于模型和线性滤波器的方法能够分离亚中尺度和内波应变场。这些领域在1983年至2002年期间的六个领域项目中被独立地检查。在上层温跃层中，涡旋和内波应变的差异通常是相似的，为0.2级。然而，随着深度的增加，垂直应变呈减小趋势（浮力频率减小为~(N2)1/2），而内波应变方差增大为~(N2)−1/2，在深度低于500 m时超过了垂直应变的5-10倍。在公司…
AbstractDepth–time records of isopycnal vertical strain have been collected from intensive CTD profiling programs on the research platform (R/P) Floating Instrument Platform (FLIP). The associated vertical wavenumber frequency spectrum of strain, when viewed in an isopycnal-following frame, displays a clear spectral gap at low vertical wavenumber, separating the quasigeostrophic (vortical) strain field and the superinertial internal wave continuum. This gap enables both model and linear-filter-based methods for separating the submesoscale and internal wave strain fields. These fields are examined independently in six field programs spanning the period 1983–2002. Vortical and internal wave strain variances are often comparable in the upper thermocline, of order 0.2. However, vortical strain tends to decrease with increasing depth (decreasing buoyancy frequency as ~(N2)1/2, while internal wave strain variance increases as ~(N2)−1/2, exceeding vortical variance by a factor of 5–10 at depths below 500 m.In co...