Abstract The first in-situ measurements of the internal tidal waves generated at San Esteban sill in the archipelago of the large islands of the Gulf of California (GC), Mexico, show that the semidiurnal barotropic tide generates nonlinear internal tides which propagate to the North (South) during the ebb (flood) of the barotropic tidal wave, resulting in significant changes in temperature and salinity to depths of 150 m. During their propagation, these internal tidal waves disintegrated into groups of short, high amplitude, strongly nonlinear waves. The leading edges of these wave groups had vertical displacements reaching 50–80 m, horizontal wavelengths about 1 km, and phase speeds of about 1.2 m s−1. The POM numerical model (Princeton Ocean Model) was used to explore the processes in this area and results were in good agreement with the instrumental data. The internal tidal waves generated from the sill resulted in strong vertical and horizontal mixing, which most likely contributes to the high productivity of this area of the GC (Gaxiola-Castro, 1992, Ruvalcaba-aroche, 2019).

中文翻译：

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加利福尼亚湾水下基石上产生的高振幅内潮波

摘要 对墨西哥加利福尼亚湾 (GC) 大岛群岛圣埃斯特班基台产生的内潮汐的首次原位测量表明，半日正压潮汐产生非线性内潮，向北传播。 （南部）在正压潮汐波退潮（洪水）期间，导致温度和盐度发生显着变化，深度达 150 m。在它们的传播过程中，这些内部潮汐波分解成一组短的、高振幅的、强非线性的波。这些波群的前缘垂直位移达50-80 m，水平波长约1 km，相速度约1.2 m s-1。利用POM数值模型（普林斯顿海洋模型）对该区的过程进行了探索，结果与仪器数据吻合较好。门槛产生的内部潮汐波导致强烈的垂直和水平混合，这很可能有助于 GC 区域的高生产力（Gaxiola-Castro，1992；Ruvalcaba-aroche，2019）。