Vertical velocity

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The subroutine real3u distinguishes between 3 vertical velocities:

real vertical velocity
vertical velocity relative to a fix reference
geometric vertical velocity
vertical velocity relative of coordinate system (which moves due to the movement of the free surface)
upwelling vertical velocity
vertical velocity relative to a the vertical coordinate system = HU3II/HU3II

The three velocities are related by:

real vertical velocity = geometric vertical velocity + upwelling vertical velocity
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