A demonstration of cycled 4D-Var in the
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M. J. P. Cullen
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Article
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2010
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John Wiley and Sons
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English
β 392 KB
## Abstract The justification for the standard fourβdimensional variational data assimilation (4DβVar) method used at several major operational centres assumes a perfect forecast model, which is clearly unrealistic. However, the method has been very successful in practice. We investigate the reason