大Richardson数下小尺度湍流的演化

IF 1.7 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Nonlinear Processes in Geophysics Pub Date : 2023-11-15 DOI:10.5194/npg-2023-22

Lev Ostrovsky, Irina Soustova, Yuliya Troitskaya, Daria Gladskikh

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引用次数: 0

摘要

摘要。将作者早先提出的分层湍流理论应用于海洋上层的资料，证实了小尺度湍流在准平稳水平上，即使在大的理查德森数梯度下，由于动能和势能之间的交换，也可以被放大和支持。利用Forryan et al.(2013)给出的Brunt-Väisälä频率和垂直电流剪切的平均廓线，计算出了动能耗散率廓线，与实验数据较为吻合。这证实了在真实的地下湍流模型中包含势能的重要性。

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Evolution of small-scale turbulence at large Richardson numbers

Abstract. The theory of stratified turbulent flow developed earlier by the authors is applied to data from the upper oceanic level to confirm that small-scale turbulence can be amplified and supported at a quasi-stationary level even at large gradient Richardson numbers due to the exchange between kinetic and potential energies. Using the mean profiles of Brunt-Väisälä frequency and vertical current shear given in Forryan et al. (2013), the profiles of kinetic energy dissipation rate are calculated, to be in reasonable agreement with the experimental data. This confirms the importance of including potential energy into realistic models of subsurface turbulence.

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来源期刊

Nonlinear Processes in Geophysics 地学-地球化学与地球物理

CiteScore

4.00

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Nonlinear Processes in Geophysics (NPG) is an international, inter-/trans-disciplinary, non-profit journal devoted to breaking the deadlocks often faced by standard approaches in Earth and space sciences. It therefore solicits disruptive and innovative concepts and methodologies, as well as original applications of these to address the ubiquitous complexity in geoscience systems, and in interacting social and biological systems. Such systems are nonlinear, with responses strongly non-proportional to perturbations, and show an associated extreme variability across scales.