Annual Sea Level Amplitude Analysis over the North Pacific Ocean Coast by Ensemble Empirical Mode Decomposition Method

Understanding spatial and temporal changes of seasonal sea level cycles is important because direct influence on coastal systems. The annual cycle substantially larger than semi-annual in most parts the ocean. Ensemble empirical mode decomposition (EEMD) method has been widely used to study tidal component, long-term rise, decadal variation. In this work, EEMD analyze observed monthly anomalies detect characteristics. Considering that variations variation Northeast Pacific Ocean are poorly studied, trend characteristics amplitudes related mechanisms North investigated using tide gauge records covering 1950–2016. average amplitude exhibits interannual-to-decadal variability within range 14–220 mm. largest value ~174 mm west coast South China Sea. other regions Ocean, mean relatively low between 77 124 for western 84 87 eastern coast. estimated values areas Sea have statistically decreased over 1952–2014 with a −0.77 mm·yr−1 −0.11 mm·yr−1. Our results suggested decreasing good agreement wind stress associated Decadal Oscillation (PDO). This phenomenon also explains especially high correlations since 1980 (R = 0.61−0.72).