Linear Rossby-wave equation (source code)

= Linear Rossby-wave equation
{c}

For a mode with streamfunction $\phi$, <deformation radius> $L_D$, and constant planetary-vorticity gradient $\beta$, the <Linear Rossby-wave equation> is
$$
\partial_t(\nabla_h^2\phi-L_D^{-2}\phi)+\beta\phi_x=F.
$$
In the long-wave limit it becomes a first-order westward transport equation.