Preprints
https://doi.org/10.5194/os-2021-80
https://doi.org/10.5194/os-2021-80

  30 Aug 2021

30 Aug 2021

Review status: this preprint is currently under review for the journal OS.

Simultaneous estimation of Ocean mesoscale and coherent internal tide Sea Surface Height signatures from the global Altimetry record

Clément Ubelmann1, Loren Carrere2, Chloé Durand2, Gérald Dibarboure3, Yannice Faugère2, Maxime Ballarotta2, Frédéric Briol2, and Florent Lyard4 Clément Ubelmann et al.
  • 1Ocean-Next, 90 chemin du Moulin, 38660 La Terrasse, France
  • 2Collecte Localisation Satellite, 11 rue Hermès, Parc Technologique du Canal 31520 Ramonville Saint-Agne France
  • 3Centre National d’Etudes Spatiales, 18 avenue Edouard Belin, 31401 Toulouse, France
  • 4LEGOS, 14 avenue Edouard Belin, 31400 Toulouse, France

Abstract. This study proposes an approach to estimate the Ocean Sea Surface Height signature of coherent internal tidesfrom 25 years of along-track altimetry record, with a single inversion over time, resolving both internal tide contributions andmesoscale eddy variability. The inversion is performed through reduced-order basis with conjugate gradient resolution. Theparticularity of this approach is to mitigate the potential aliasing effects between mesoscales and internal tide estimation fromthe uneven altimetry sampling (observing the sum of these components) by accounting of their statistics simultaneously, while other methods generally use a prior for mesoscales. The four major tidal components are considered (M2,K1,S2,O1) over theperiod 1992–2017 on a global configuration. From the solution, we use altimetry data after 2017 for an independent validation,to evaluate the benefits of the simultaneous inversion, and also to compare the skills with an existing model.

Clément Ubelmann et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on os-2021-80', Edward Zaron, 22 Sep 2021
  • CC1: 'Comment on os-2021-80', Zhongxiang Zhao, 19 Oct 2021
  • RC2: 'Comment on os-2021-80', Anonymous Referee #2, 20 Oct 2021

Clément Ubelmann et al.

Clément Ubelmann et al.

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Short summary
The signature of internal tides becomes an important component for high-resolution altimetry over the oceans. Several studies have proposed some solutions to resolve part of these internal tides based on the altimetry record. Following these studies, we propose here a new inversion approach supposed to mitigate aliasing with other dynamics. After a description of the methodology, the solution for the main tidal components has been successfully validated against independent observations.