In the first sensitivity study, the nonlinear advection terms were removed from the dynamic equations. Otherwise, the same parameters as the control run were used. The figures and analysis were performed after computing the difference between control and non non-linear terms runs. The differential surface vector velocities (Fig. 7) do not show evidence for general circulation patterns except a couple of mesoscale eddies, and especially the UTB eddy, which indicates that the non-linearity does not change the general circulation pattern except for the UTB anticyclonic eddy. However, our computation shows that the non-linearity causes a noticeable change in the volume transport.