Summary of the global 3D-Var analyses

• 3D-Var FGAT formulation

• Global version of the OPA model (ORCA)

• Assimilation of global temperature in situ data (ECMWF data based on GTSPP distribution)

• Jb modelling:

  • Flow dependent error variance
  • Multivariate balanced/unbalanced formalism (Derber and Bouttier)
  • Flow dependent multivariate T-S preservation scheme
  • Flow dependent density/currents scheme (extended geostrophy)
  • Allows for assimilation of oceanic observations

• Analyses on the 1990-1999 period