Figure 2. Conceptual schematic of upper and lower layer circulation in the northern GSC during late spring. Solid lines are near surface currents, heavy solid lines are deep currents associated with Maine Intermediate Water (MIW), and dashed lines are the locations of the tidal mixing thermal fronts. Shaded areas with dots and lines are the convergence zones for April 1988 and June 1989 surveys, respectively. (C. Chen, R. C. Beardsley and R. Limeburner, "Variability of water properties and currents in late spring in the northern Great South Channel", Cont. Shelf Res., submitted).