OSU TPXO Tide Models

Here we present TPXO global, regional and local models of barotropic tide, obtained with 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 include 3 components: bathymetry/depth grid (m), elevations (m) and transports (m2/s). Tidal elevations and transports 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 nodal corrections. Then amplitude = | 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.

We also provide software tools to work with the models - OTPS(nc). Besides there exist other free lance software to work with TPXO data, i.e. TMD, Harmonica or OTPS2FRC.

All our models and software are under the same license:

COPYRIGHT Egbert & Erofeeva, OSU, 2010

Our historical regional and local tidal models are still 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.

HOW TO REGISTER

TPXO/OTPS, regional/local models can be licensed for commercial use at modest cost - please contact Dr. Erofeeva or Prof. Egbert on details. Our customers are eligible for free upgrades within one year.

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.