Q1. What is an ocean tide model and which models are commonly used?
A： Because tides at different periods exhibit different patterns, the periods themselves are used to distinguish ocean-tide models. For example, the M2 tide derived from the FES02 model is usually displayed with the amplitude as a solid black line and the phase as a dashed red line. Beyond FES, widely used ocean-tide models include CSR, TPXO, GOT and ORI, all of which combine satellite altimetry with periodic mathematical formulations.
