Poseidon Ocean Model
	Poseidon GEMS Eq_State

Pressure Gradients in Poseidon

Because of the generalized coordinate treatment in poseidon, we use a Jacobian finite volume treatment of the pressure gradient force. The choice that was made is to use S. J. Lin's (1997) form, which reduces to the Montgomery potential form if the coordinate is isopycnal, and which maintains the irrotationality constraint around closed contours of geopotential or bottom pressure.

A detailed description of the method is detailed here(pdf)