Internal tide | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-03

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Internal_tide


00:00:52 1 Simple explanation
00:02:08 2 Location
00:03:32 3 Propagation and dissipation
00:06:46 4 Abyssal mixing and meridional overturning circulation
00:09:23 5 Internal tides at the beach
00:10:06 6 Internal tides, internal mixing, and biological enhancement
00:11:10 7 See also



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SUMMARY
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Internal tides are generated as the surface tides move stratified water up and down sloping topography, which produces a wave in the ocean interior.  So internal tides are internal waves at a tidal frequency.  The other major source of internal waves is the wind which produces internal waves near the inertial frequency.  When a small water parcel is displaced from its equilibrium position, it will return either downwards due to gravity or upwards due to buoyancy.  The water parcel will overshoot its original equilibrium position and this disturbance will set off an internal gravity wave.  Munk (1981) notes, "Gravity waves in the ocean's interior are as common as waves at the sea surface-perhaps even more so, for no one has ever reported an interior calm."