Equations of motion 1 Eulerian 1 Geostrophic balance Grid-based 1 Iterative methods 1 Lagrange multipliers 1 Lagrangian 1 Numerical methods 1 Numerical models 1 Ocean circulation 1 Oceanography 1 Reduced model 1 Slow dynamics 1 Slow flow 1 Two time scale 1 Waves in rotating fluids 1 computational methods 1 ocean circulation 1 waves in rotating fluids 1