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首页> 外文期刊>Oceanographic Literature Review >Influence of the distortion of vertical wavenumber spectra on estimates of turbulent dissipation using the finest-ale parameterization: Eikonal calculations
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Influence of the distortion of vertical wavenumber spectra on estimates of turbulent dissipation using the finest-ale parameterization: Eikonal calculations

机译：垂直波浪谱畸变对湍流耗散估计的影响：Eikonal Calculation

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摘要

The finescale parameterization, formulated on the basis of a weak nonlinear wave-wave interaction theory, is widely used to estimate the turbulent dissipation rate «. However, this parameterization has previously been found to overestimate « in the Antarctic Circumpolar Current (ACC). One possible reason for this overestimation is that vertical wavenumber spectra of internal wave energy are distorted from the canonical Garrett-Munk spectrum by a spectral hump at low wavenumbers (0.01 cpm). Such distorted vertical wavenumber spectra were also observed in other mesoscale eddyrich regions. In this study, using eikonal simulations, in which internal wave energy cascades are evaluated in the frequency- wavenumber space, we examine how the distortion of vertical wavenumber spectra impacts the accuracy of the finescale parameterization. It is shown that the finescale parameterization overestimates « for distorted spectra with a low-verticalwavenumber hump because it incorrectly takes into account the breaking of these low-vertical-wavenumber internal waves. This issue is exacerbated by estimating internal wave energy spectral levels from the low-wavenumber band rather than from the high-wavenumber band, which is often contaminated by noise in observations. Thus, to accurately estimate the distribution of « in eddy-rich regions like the ACC, high-vertical-wavenumber spectral information free from noise contamination is indispensable.
机译：基于弱非线性波浪相互作用理论制定的FineScale参数化，广泛用于估计湍流耗散率«。但是，先前已发现此参数化以高估«在南极Circumpolar电流（ACC）中。这种高估的一个可能的原因是内波能量的垂直波浪光谱通过低波数（0.01cpm）的光谱驼峰从规范GARRETT-MUNK光谱扭曲。在其他Mesoscale Eddyrich地区也观察到这种扭曲的垂直波浪谱。在本研究中，使用eikonal仿真，其中在频率波数空间中评估内部波能量级联，我们检查垂直波数光谱的失真如何影响FineScale参数化的准确性。结果表明，FINESCALE参数化高估了«对于具有低垂直线驼峰的扭曲光谱，因为它不正确地考虑了这些低垂直波数内部波的断裂。通过估计来自低波数带的内部波能谱水平而不是从高波数带来加剧该问题，这通常被观察中的噪声污染。因此，为了准确地估计«在诸如ACC等涡流的区域中的分布，没有噪声污染的高垂直波数光谱信息是必不可少的。

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  • 来源
    《Oceanographic Literature Review》 |2021年第7期|1427-1427|共1页
  • 作者

    A. Takahashi; T. Hibiya; A.C.N. Garabato;

  • 作者单位

    Department of Earth and Planetary Science Graduate School of Science The University of Tokyo Tokyo Japan;

    Department of Earth and Planetary Science Graduate School of Science The University of Tokyo Tokyo Japan;

    Department of Earth and Planetary Science Graduate School of Science The University of Tokyo Tokyo Japan;

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