Fig. 3.

Plots showing the results from the OGCM for the freshwater (A, D, and G), mid- (B, E, and H), and high (C, F, and I) range salinity scenarios; note the different scales in A, D, and G. (A–C) Black contours of the overturning streamfunction $\mathrm{\Psi }$ show the structure of the meridional overturning circulation through the depth of the ocean. The contour intervals are (A) 1 Sv (=10⁶ m³⋅s⁻¹) and (B and C) 20 Sv. Solid and dashed contours indicate positive (poleward surface flow) and negative (equatorward surface flow) circulation, respectively, as indicated by the arrows. Note the different depth scales; the surface layer is extended to show this region of finer detail; the color shading in A–C shows the zonally averaged temperature (°C). (D–F) Northward ocean heat transport (PW = 10¹⁵ W). (G–I) Surface heat flux (W⋅m⁻²); positive values are from ocean to atmosphere.