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
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