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by ECOLA last modified Apr 10, 2014 02:57 PM
Developments at LEGOS for the FES2014 project

The new finite element global tides atlas FES2014 is funded by the CNES agency (Centre National d'Etudes Spatiales) and supported by CNRS (Conseil National de la Recherche Scientifique). It involves the LEGOS laboratory and two science engineering companies, Noveltis and CLS.

As for FES2012, the two primary objectives are to take profit of the long-running altimeter missions records and to increase the atlas spatial resolution. Its production has been decided to integrate the latest developments in the tidal modeling and data assimilation that could not be integrated in the FES2012 project at its time. The FES2014 atlas should be available in early 2015.

This project also aims to be a tribute to the outstanding contribution of C. Le Provost to the Topex/Poseidon tidal modeling achievements.

LEGOS project team: F. Lyard, D. Allain, C. Nguyen

Additional contributors: F. Birol (CTOH/LEGOS), M.Llubbes (GET), D. Greenberg (BIO), B. Levier (Mercator-Ocean)



FES2012 M2 hydrodynamic solution (2.5 cm RMS accuracy compared to altimetry)


FES2014 M2 hydrodynamic solution (1.3 cm RMS accuracy compared to altimetry)


FES2014 configuration and inputs




  • Bathymetry

Precise DTMs construction from ship nautical charts date

Several regional DTMs have been constructed (using the COMODO tools) from available soundings data

Smith&Sandwell smoothing

Recent release of Smith&Sandwell bathymetry seem to show a reduced bias compared to other DTMs, even in shallow waters. A median filter has been used to remove the noisy patterns.

Deep oceans

Deep oceans bathymetry

Siberian Shelf

The bathymetry for the Siberian Shelf seems to be too smooth in IBCAO and GEBCO grids..

FES2014 hydrodynamics simulations

  • Loading/self-attraction

Loading (radial displacements)

Loading/self-attraction (combined (radial displacements and potential terms)

Atmospheric pressure forcing (S1, S2)


FES2014 data assimilation



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