From Ryan Holmes. Atmospheric storms near the equator force the ocean at regular intervals. The ocean responds with internal waves of its own. The Coriolis force from the rotation of the Earth influences the ocean's waves significantly. Modellers in the past tended to simplify the mathematics of the Coriolis effect, only taking the vertical component into account (traditional). The argument is that the horizontal component is negligible. But sometimes small effects produce outsized consequences. Near the equator, the full Coriolis effect (non-traditional) can lead to sharp wave beams which can focus and dissipate energy quite differently from what is often assumed.