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Using 20 years of accurately calibrated, high-resolution\udobservations of sea surface height anomalies (SSHAs) by satellite borne\udaltimeters, we show that in the Indian Ocean south of the Australian coast the\udlow-frequency variations of SSHAs are dominated by westward propagating,\udtrapped, i.e., non-harmonic, Rossby (Planetary) waves. Our results demonstrate\udthat the meridional-dependent amplitudes of the SSHAs are large only within a\udfew degrees of latitude next to the southern Australian coast while farther in\udthe ocean they are uniformly small. This meridional variation of the SSHA\udsignal is typical of the amplitude structure in the trapped wave theory. The\udwestward propagation speed of the SSHA signal is analyzed by employing three\uddifferent methods of estimation. Each one of these methods yields speed\udestimates that can vary widely between adjacent latitudes but the combination\udof at least two of the three methods yields much smoother variation. The\udestimates obtained in this manner show that the observed phase speeds at\uddifferent latitudes exceed the phase speeds of harmonic Rossby (planetary)\udwaves by 140 to 200 % (which was also reported in previous studies).\udIn contrast, the theory of trapped Rossby (planetary) waves in a domain\udbounded by a wall on its equatorward side yields phase speeds that\udapproximate more closely the observed phase speeds in the study area

Trapped planetary (Rossby) waves observed in the Indian Ocean by satellite borne altimeters