Ocean Tide Models

Any geodetic measurement made with sufficient precision will reveal tidal signals. Sometimes they are the signal of interest; often they are noise to be removed. In any event, because of this, the Geodesy and Geophysics Laboratory has long had a keen interest in ocean tides. The most accurate models of tides have been constructed by analyzing several decades of satellite altimeter data.

Several models developed within this laboratory are distributed via the following tar files, which have associated "readme" files and software.


M2 Higher resolution file


Short-period (diurnal/semidiurnal) tides:   GOT4.8.tar.gz   GOT4.10c.tar.gz

Long-period tides:  RE2014_LongPeriodTides_rel.tar

Long-period tidal variations in Earth Rotation: 

EOP ascii table   Fortran subroutine which corresponds to work described in Ray & Erofeeva (2014), "Long-period tidal variations in the length of day," J. Geophys. Res. Solid Earth, 119, 1498–1509. doi: 10.1002/2013JB010830