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Description of the upgrade
The first version of a four-dimensional variational data assimilation system (4D-Var) was introduced. It is based on an evolution of the previous 3D-Var system with a 6-hour cycling.
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Implemented: 25 November 1997 |
Resources
ECMWF Newsletter: Please see "The operational implementation of 4D-Var" the ECMWF Newsletter No.78
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