Traditional approximation (geophysical fluid dynamics)
= Traditional approximation
{disambiguate=geophysical fluid dynamics}
The traditional approximation retains only the locally vertical component of planetary rotation in the Coriolis force. It gives the horizontal acceleration $f\widehat{\mathbf z}\times\mathbf u_h$ and neglects terms involving the horizontal component of the rotation vector and vertical velocity.
= Traditional approximation
{synonym}