## Abstract The Met Office has developed a 4DβVar data assimilation system, which was implemented in the global forecast system on 5 October 2004. This followed a development path based on the previous 3DβVar configuration, with many aspects kept in common. A 4DβVar capability was provided by the i
Four-dimensional variational assimilation and predictability in a quasi-geostrophic model
β Scribed by KYLE SWANSON; ROBERT VAUTARD; CARLOS PIRES
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 427 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0280-6495
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## Abstract Key __a____priori__ information used in 4DβVar is the knowledge of the system's evolution equations. In this article we propose a method for taking full advantage of the knowledge of the system's dynamical instabilities in order to improve the quality of the analysis. We present an algo
## Abstract Incremental fourβdimensional variational assimilation (4DβVar) is an algorithm that approximately solves a nonlinear minimization problem by solving a sequence of linearized (quadratic) minimization problems of the form where **x** is the control vector, **A** is a symmetric positiveβd