Does that kind of thing really happen? Let's try
it out in an experiment. We made a stable
stratification in a donut-shaped water tank using
salt, and assumed it to be the equatorial
stratosphere. In the real stratosphere, waves are
transmitted from below, however, it isn't easy to
cause waves at the bottom of a water tank. Instead,
we turned
the model upside-down
and vibrated a rubber membrane on the surface of
the water with air, and created waves (internal
gravity waves) that way.
Waves are vertically symmetrical, so turning the
model upside-down essentially doesn't affect the
model. The problem is whether or not a one-way
current will be formed by the waves oscillating
symmetrically back and forth, and if that current
will reverse as planned.
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