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Article Dans Une Revue Frontiers in Earth Science Année : 2021

The Copernicus Global 1/12° Oceanic and Sea Ice GLORYS12 Reanalysis

Jean-Michel Lellouche
  • Fonction : Auteur
Eric Greiner
  • Fonction : Auteur
Romain Bourdallé-Badie
  • Fonction : Auteur
Gilles Garric
  • Fonction : Auteur
Angélique Melet
Marie Drévillon
  • Fonction : Auteur
Clément Bricaud
  • Fonction : Auteur
Mathieu Hamon
  • Fonction : Auteur
Olivier Le Galloudec
  • Fonction : Auteur
Charly Regnier
  • Fonction : Auteur
Tony Candela
  • Fonction : Auteur
Charles-Emmanuel Testut
  • Fonction : Auteur
Florent Gasparin
Giovanni Ruggiero
  • Fonction : Auteur
Mounir Benkiran
  • Fonction : Auteur
Yann Drillet
  • Fonction : Auteur

Résumé

GLORYS12 is a global eddy-resolving physical ocean and sea ice reanalysis at 1/12° horizontal resolution covering the 1993-present altimetry period, designed and implemented in the framework of the Copernicus Marine Environment Monitoring Service (CMEMS). The model component is the NEMO platform driven at the surface by atmospheric conditions from the ECMWF ERA-Interim reanalysis. Ocean observations are assimilated by means of a reduced-order Kalman filter. Along track altimeter sea level anomaly, satellite sea surface temperature and sea ice concentration, as well as in situ temperature and salinity vertical profiles are jointly assimilated. A 3D-VAR scheme provides an additional correction for the slowly-evolving large-scale biases in temperature and salinity. The performance of the reanalysis shows a clear dependency on the timedependent in situ observation system. The general assessment of GLORYS12 highlights a level of performance at the state-of-the-art and the capacity of the system to capture the main expected climatic interannual variability signals for ocean and sea ice, the general circulation and the inter-basins exchanges. In terms of trends, GLORYS12 shows a higher than observed warming trend together with a slightly lower than observed global mean sea level rise. Comparisons made with an experiment carried out on the same platform without assimilation show the benefit of data assimilation in controlling water mass properties and sea ice cover and their low frequency variability. Moreover, GLORYS12 represents particularly well the small-scale variability of surface dynamics and compares well with independent (non-assimilated) data. Comparisons made with a twin experiment carried out at 1/4° resolution allows characterizing and quantifying the strengthened contribution of the 1/12° resolution onto the downscaled dynamics. GLORYS12 provides a reliable physical ocean state for climate variability and supports applications such as seasonal forecasts. In addition, this reanalysis has strong assets to serve regional applications and provide relevant physical conditions for applications such as marine biogeochemistry. In the near future, GLORYS12 will be maintained to be as close as possible to real time and could therefore provide relevant and continuous reference past ocean states for many operational applications.

Dates et versions

hal-04203551 , version 1 (11-09-2023)

Identifiants

Citer

Jean-Michel Lellouche, Eric Greiner, Romain Bourdallé-Badie, Gilles Garric, Angélique Melet, et al.. The Copernicus Global 1/12° Oceanic and Sea Ice GLORYS12 Reanalysis. Frontiers in Earth Science, 2021, 9, 698876 (27p.). ⟨10.3389/feart.2021.698876⟩. ⟨hal-04203551⟩
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