Longitude-time plot of 20 C depth on the equator. Contour interval is 20 m, and deeper thermocline depths are darker shades. Longitude-time plot of zonal winds on the equator. The plot has the same format as Figure 3 for 20 C depth. The contours and shading show the zonal wind at a contour interval of 3 m s -1 .
Westerlies are darker shades.
Both time series have been smoothed with a 17-day triangle filter. Longitude-time plot of SST on the equator. The plot has the same format as Figures 3 and 4. The slanted lines are the same Kelvin wave paths shown in Figure 3. Each variable has a separate scale as indicated.