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Variational Data Assimilation (presentation, 2001)

June 2001

Presentation of Claude Fischer, Andras Horanyi and Wafaa Sadiki during the ALATNET training course on Data Assimilation in Gourdon, 11-22 June 2001.

Contents :

  • General aspects :
    • motivations
    • history
    • general formulation of the cost function
    • error covariance matrices
    • minimization algorithms
  • Practical implementation : where the problems start and where refinements are needed
    • (multi-)incremental approach
    • quasi-continuous approach
    • the exemple of Météo-France 4D-Var
    • flow dependant structure function
  • Limited Area and Lateral Boundary Coupling
    • scale selection and localisation
    • possible tools
    • nested assimilation cycles
    • boundaries and coupling in 4D-Var

Attached documents

Variational Data Assimilation

10 November 2005
Document : GZ
2.2 Mb

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