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Assimilation techniques: 3dVar
April 2001
By Mike Fisher
European Centre for Medium-Range Weather
Forecasts.
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1 . Introduction
This aim of this lecture is to complement the more theoretical presentation of 3dVar given in the "Assimilation algorithms" module with a discussion of some of the techniques which are necessary for a practical implementation of the method. The ECMWF implementation of 3dVar is described. This was the operational ECMWF analysis between 30 January 1996 and 24 November 1997. The reader is referred to Andersson et al. 1998, Courtier et al. 1998 and Rabier et al. 1998 for a more detailed description.
The topics covered in this lecture are:
| • The incremental method |
| • Initialization of analysis increments |
| • Formulation of the background cost function |
| • Methods for calculating background error statistics |
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07.06.2002 |
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