Documentation for Goddard Ocean Tide Solution GOT5: Global Tides from Multi-mission Satellite Altimetry

Goddard Ocean Tide GOT5 is a new solution for the amplitudes and phases of the daily and sub-daily global ocean tides, based on decades of radar altimetry from multiple satellite missions. Over the main part of the deep ocean, between latitudes ±66°, the solution rests primarily with the series of five satellites Topex/Poseidon, Jason-1, Jason-2, Jason-3, and Sentinel-6A Michael Freilich, but in shallow seas and in polar latitudes other satellite altimeters were also used. The tidal analysis of these data was done relative to a prior model, which for the most part was the Finite Element Solution FES2014 of Lyard et al. (2021), with some minor patches. The GOT5 solutions were thus starting with a very good global model, and the obtained results benefit greatly from that. This report documents some of the data processing details underlying the GOT5 tides. There are several variants of GOT5, arising not only from (experimental) refinements in processing algorithms but also from different approaches to handling the problem of atmospheric loading; a special variant, GOT5.5D, was designed to be used in conjunction with the current version of the Dynamic Atmosphere Correction by attempting to overcome inadequacies in adopted models of atmospheric tides. This report includes a comprehensive set of cotidal charts for twenty constituents in the diurnal, semidiurnal, terdiurnal, and quarter-diurnal bands.