Eady model কী?

The Eady model is a Boussinesq fluid on an $f$-plane between two rigid horizontal surfaces at $z = 0$ and $z = H$, with uniform buoyancy frequency $N$ and a westerly wind that increases linearly with height, $U = \Lambda z$, in thermal-wind balance with a uniform poleward decrease of temperature; its disturbances obey the quasi-geostrophic equations.