OSU TPXO Tide Models

Here we present  TPXO global, regional and local models of barotropic tide, obtained with the methods described in details by Egbert, Bennett, and Foreman (1994)  and further by Egbert and Erofeeva,2002. These methods were implemented in the software package OTIS (OSU Tidal Inversion Software). All our global/regional/local models were obtained with OTIS by assimilating satellite altimetry and sometimes other data. 

Our tidal models are gridded sets of tidal harmonic constants at different resolutions and include 3 components:

 The harmonic constants are given as complex amplitudes, so that the partial tide at time t for a single constituent of frequency w at location x is given by  the formula:

h(t,x) = Pu(t,x).Re [ h(x) exp { i [w (t - t0) + V0(t0)+Ph(t,x)] } ]

where V0(t0) is the astronomical argument for the constituent at time t0, Pu(t,x) and Ph(t,x) are the nodal corrections.  Then amplitude is | h |  and  phase = atan (-Im(h)/Re(h)). Tidal elevations are referenced to mean sea level (MSL), so long time average of model time series is zero. Tidal currents are defined as transports divided by the depth. 

We provide some software tools to go with our models such as OTPS(nc). There also exist multiple 3rd parties software to work with TPXO binary/netcdf formats, i.e. TMDHarmonica, OTPS2FRC etc.

All our models and software are under the same license: 

COPYRIGHT Egbert & Erofeeva, OSU, 2010 

Our older regional and local tidal models are freely available for academic research and other non-commercial uses. 

TPXO global tide models are also available for academic research and other non-commercial uses, but require registration. 



To refer to our models/software in your publications please use the citation:

Egbert, Gary D., and Svetlana Y. Erofeeva. "Efficient inverse modeling of barotropic ocean tides." Journal of Atmospheric and Oceanic Technology 19.2 (2002): 183-204.

Check out our TPXO Web Service to get tide predictions from TPXO9-atlas at any location and time.