Preprints
https://doi.org/10.5194/os-2020-96
https://doi.org/10.5194/os-2020-96

  16 Oct 2020

16 Oct 2020

Review status: a revised version of this preprint was accepted for the journal OS and is expected to appear here in due course.

FES2014 global ocean tides atlas: design and performances

Florent H. Lyard1, Damien J. Allain2, Mathilde Cancet3, Loren Carrère4, and Nicolas Picot5 Florent H. Lyard et al.
  • 1LEGOS/CNRS, Toulouse, France
  • 2LEGOS/CNES, Toulouse, France
  • 3Noveltis, Toulouse, France
  • 4CLS, Toulouse, France
  • 5CNES, Toulouse, France

Abstract. Since the mid-1990’s, a series of Finite Element Solution (FES) global ocean tidal atlases has been produced and released with the primary objective to provide altimetry missions with tidal de-aliasing correction at the best possible accuracy. We describe the underlying hydrodynamic and data assimilation designs for the last FES2014 release (finalized in early 2016), and some accuracy assessments especially for the altimetry de-aliasing purposes. The FES2014 atlas shows extremely significant improvements compared to the FES2004 (Lyard et al. 2006) and (intermediary) FES2012 atlases, in all ocean regions, especially in shelf and coastal seas; these advances are due to the unstructured grid flexible resolution, recent progress in the (prior to assimilation) hydrodynamic tidal solutions and to the use of an ensemble data assimilation technique. Compared to earlier releases, the FES2014 available tidal constituents spectrum has been significantly extended, the overall resolution augmented; some new additional scientific by-products have been derived from the atlas and are available, including the loading and self-attraction effects, energy diagnostics or the lowest astronomical tides . Compared to the other available global ocean tidal atlases, FES2014 clearly shows improved de-aliasing performances in most of the global ocean areas. It has consequently been integrated in satellite altimetry and gravimetry data processing, and adopted in recently renewed ITRF standards. It also provides very accurate open boundary tidal conditions for regional and coastal modelling.

Florent H. Lyard et al.

 
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Status: closed
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Florent H. Lyard et al.

Florent H. Lyard et al.

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Short summary
Since the mid-1990’s, a series of FES (Finite Element Solution) global ocean tidal atlases have been produced with the primary objective to provide altimetry missions with tidal de-aliasing correction. We describe the underlying hydrodynamic/data assimilation design and accuracy assessments for the FES2014 release. The FES2014 atlas shows overall improved performances and has consequently been integrated in satellite altimetry and gravimetric data processing, and adopted in ITRF standards.