Figure 4

Figure 4: Sea level at (a) Caldera (27°04'S, 70°50'W and (c) Eastern Island (27°09'S, 109°27'W. (b) Low-passed, interannual TOPEX/POSEIDON sea level anomalies near 27°S from the South American coast to 110°W for the period indicated in the figure. Dashed line indicates the slope of the curve related to a perturbation propagating with the phase speed of a long Rossby wave (betac2/f2, where beta and c are the meridional gradient of f), the Coriolis parameter and the first-mode long wavespeed-about 2.3 m/s in the region, respectively).