Figure 11.6 Upper Left: Mean annual wind stress Tx(y) over the Pacific and the curl of the wind stress. φb are the northern and southern boundaries of the gyres, where My = 0 and curl τ = 0. φ0 is the center of the gyre. Upper Right: The mass transport stream function for a rectangular basin calculated by Munk (1950) using observed wind stress for the Pacific. Contour interval is 10 Sverdrups. The total transport between the coast and any point x, y is ψ ( x, y ). The transport in the relatively narrow northern section is greatly exaggerated. Lower Right: North-South component of the mass transport. From Munk (1950).