setGeostrophicForcingCoefficients

set forcing values for the geostrophic part of the flow

---

Declaration

 setGeostrophicForcingCoefficients(A0bar,options)

Parameters

• A0bar A0 ‘mean’ value to relax to
• MA0 (optional) forcing mask, A0. 1s at the forced modes, 0s at the unforced modes. If it is left blank, then it will be produced using the nonzero values of A0bar
• tau0 (optional) relaxation time

Discussion

Forcing takes the following form,

\[\frac{\partial}{\partial t} A_0^{klj} = \underbrace{M_{A_0}^{klj} \left(\bar{A}_0^{klj} - A_0^{klj} \right)/ \tau_0}_{F_\textrm{force}} + F_\textrm{inertial}^{klj} + F_\textrm{damp}^{klj}\]

where \(M_{A_0}^{klj}\) are masks (1s and 0s), \(\bar{A}_0^{klj}\) are mean amplitudes, and \(\tau_0\) are time scales. If the time scale is set to 0, then the mean amplitudes remain fixed for all time. In that limit, the equations can be written as,

\[\frac{\partial}{\partial t} A_0^{klj} = \neg M_{A_0}^{klj} \left( F_\textrm{inertial}^{klj} + F_\textrm{damp}^{klj} \right)\]