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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Diurnal Critical Latitude and the Latitude Dependence of Internal Tides, Internal Waves, and Mixing Based on Barcoo Seamount
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Diurnal Critical Latitude and the Latitude Dependence of Internal Tides, Internal Waves, and Mixing Based on Barcoo Seamount

机译：基于Barcoo Seamount的内部潮汐，内部波和混合的昼夜关键纬度和纬度依赖性

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摘要

Vertical mixing is a key issue in ocean circulation modeling today. Mixing, particularly tidal mixing, is poorly represented in ocean and climate models, which generally ignore critical latitude effects. Critical latitude is the latitude where the inertial frequency equals the tidal frequency and differs for each tidal constituent. Critical latitudes strongly influence generation and propagation of internal tides. Using a model, latitude effects on tidal interactions with a seamount were examined by varying the latitude from 20 degrees to 38 degrees, through the range of the diurnal critical latitudes. The diurnal critical latitudes were found to strongly influence propagation of the diurnal internal tides, the magnitude of the semidiurnal tides, the energy in the harmonic and higher frequencies, the barotropic mean flow, and the diffusivities. The strongest effects occurred between the K-1 and O-1 critical latitudes. Here the semidiurnal tides, harmonics, and high frequencies were enhanced, barotropic mean velocities weakened, energy at the harmonics and higher frequencies increased, and diffusivities increased. Spectral techniques indicate that most of these impacts are the result of nonlinear wave-wave interactions and resonant phenomena with the prominent mechanism harmonic transfers. There was no evidence of parametric subharmonic instabilities. The semidiurnal tides indicated a resonant response at 20 degrees S, which is near the latitude for the combined M-2 and K-1 tidal period, approximate to 19 degrees S.
机译：垂直混合是今天海洋循环建模的关键问题。混合，特别是潮汐混合，在海洋和气候模型中差不多，这通常忽略了临界纬度效应。关键纬度是惯性频率等于潮汐频率的纬度，并且对于每个潮汐组分而不同。关键纬度强烈影响内部潮汐的产生和传播。使用模型，通过在20度到38度的范围内，通过昼夜关键纬度的范围来检查与海山与海山的潮汐相互作用的纬度效应。发现昼夜关键纬度被发现强烈影响昼夜内部潮汐的繁殖，半潮汐潮汐的大小，谐波和较高频率的能量，波衡分魄的平均流动和扩散性。 K-1和O-1关键纬度之间发生的最强烈影响。在这里，增强了半峰潮，谐波和高频，波衡分魄的平均速度削弱，谐波处的能量增加，并且扩散性增加。光谱技术表明，大多数这些影响是非线性波浪相互作用和具有突出机制谐波转移的共振现象的结果。没有参数次谐型稳定性的证据。半峰潮汐在20摄氏度下表示共振响应，该响应近于组合的M-2和K-1潮汐时段，近似为19摄氏度。

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