Seasonal variations of tidal currents in the deep Timor Passage

Exact knowledge on the seasonal variations of main tidal constituents is beneficial for improving prediction. The semi-annual cycles in K 1 and S 2 tides are abnormally exaggerated by astronomical P tides, which interferes with our understanding seasonality. widely-used inference method previous studies cannot fully separate from due to inaccurate relationship. In this study, basis ‘credo smoothness’ indicates that admittances smooth functions frequencies, we develop a novel but simple address intractable issue applied explore seasonality currents observed deep Timor Passage at depth 1800m. We find timing range modulations M , O distinct. Annual much stronger than currents. annual ranges tide can reach 2.69 cm/s 1.51 cm/s, largest among constituents. Although only 1.85 considering relatively small amplitude time-averaged (2.87cm/s), most affected cycle. semi-diurnal (M ) basically synchronous while those diurnal (K generally out-of-phase. As general method, proposed be widely other sea areas local