Types of dataset: auxiliary products

DOI: 10.24400/527896/a01-2024.004   -  more metadata

Contents: The FES2022 tides database include 2 components:  tide elevations (amplitude and phase) and tide loading (amplitude and phase) on a 1/30°x1/30° grid. 

1. Tide elevations: FES2022b ocean tide model is distributed; this model has been computed using the new FES2022 tidal loading grids.
   Two versions are available: 
   • Non extrapolated version: the model is defined on a 1/30° grid directly interpolated from the finite element native grid of the model. 
   • Extrapolated version: the above version has been extrapolated on the coasts in order to cover nearly entirely the coastal regions. The procedure is explained in the user manual. The mask is also delivered.
2. Tide loading: the new FES2022b tide loading must be used to compute the FES2022b geocentric (elastic) tide as follows: 
   FES2022b geocentric (elastic) tide = FES2022b oceanic tide + FES2022b loading tide.

Use: coastal oceanography, operational oceanography, ocean circulation

Description: the product is based on a hydrodynamic model which assimilates some altimeter data and a few tide gauges. Details are given in Carrere et al., OSTST 2022.

Citation: "The FES2022 Tide product was funded by CNES, produced by LEGOS, NOVELTIS and CLS and made freely available by AVISO". CNES, 2024. FES2022 (Finite Element Solution) Ocean Tide (Version 2022) [Data set]. CNES. https://doi.org/10.24400/527896/A01-2024.004"

Geographic coverage: global

Format: NetCDF 4

Distribution media:

• Data files are on the dissemination services (on the authenticated FTP/SFTP and TDS into fes2022b/load_tide , fes2022b/ocean_tide_extrapolated and fes2022b/ocean_tide folders).  The subdirectories include all the 34 tidal components: M2, S2, K1, O1, P1, Q1, Nu2, Mu2, N2, K2, Eps2, L2, Lambda2, M4, 2N2, J1, M3, M6, M8, Mf, MKS2, Mm, MN4, MS4, MSf, MSqm, Mtm, N4, R2, S1, S4, Sa, Ssa, T2. To allow you to download as small as possible files, the files have been compressed using the xz program using the LZMA2 compression algorithms. To decompress the files, you must use this command or 7-zip if you use Windows.
• The official tidal prediction algorithm, LIBFES, is available here: https://github.com/CNES/aviso-fes/tree/2.9.7. If you use the code, please cite : "The code used to compute FES2022, was developed in collaboration between Legos, CLS and CNES and is available under GNU General Public License". 
  We guarantee the results obtained with this code, but not if using any other prediction code.

Condition of access: Tidal heights and loading effect are delivered for all purposes as stated in the licence agreement. 

File weight: max 170 MB for one height elevation file, max 240 MB for one load file and 750KB for the mask.

References and tools:

• FES2022 User manual
• Carrere et al., OSTST 2022: A new barotropic tide model for global ocean: FES2022,
  https://doi.org/10.24400/527896/a03-2022.3287
• Florent H. Lyard, Loren Carrere, Ergane Fouchet, Mathilde Cancet, David Greenberg, Gérald Dibarboure and Nicolas Picot: “FES2022 a step towards a SWOT-compliant tidal correction”, to be submitted to Ocean Sciences.

Copyright: 2022- ongoing Legos/Noveltis/Cnes/CLS

To get an access to the FES products, please fill in, select the product "FES (Finite Element Solution - Oceanic Tides Heights)" and valid the following form: