Title: Determination of Harmonic Parameters with Temporal Variations: An Enhanced Harmonic Analysis Algorithm and Application to Internal Tidal Currents in the South China Sea

Journal: Journal of Atmospheric and Oceanic Technology, 35: 1375-1398

Authors: JING. -Z., H. -D. Pan, Q. -L. Zhang, X. -Q. Lv*, W. Zhao

Abstract: As an effective tool to distinguish different tidal components, classical tidal current harmonic analysis has been widely used to obtain harmonic parameters of internal tidal currents. However, harmonic parameters cannot exactly reveal the motion of internal tides as the irregular temporal variations for internal tides are significant in many regions of the world’s oceans. An enhanced harmonic analysis (EHA) algorithm based on the independent point scheme and cubic spline interpolation is presented in this paper to obtain harmonic parameters with temporal variations for different tidal constituents of internal tides. Moreover, this algorithm is applied to analyze 14-month long current data obtained from a mooring located on the continental shelf of northeastern South China Sea. The obvious irregular temporal variations for the four principle constituents (M2, K1, S2 and O1) of internal tides in this region are indicated. Hopefully, this algorithm might present a brand-new view for researchers to investigate the irregular temporal motions of internal tides.