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• W2131036706 abstract "A four-dimensional variational (4DVAR) data assimilation problem may be constrained so that the solution closely fits the observations but is balanced. In this way, the processes of data analysis and initialization are combined. The method of initialization considered here, digital filtering, is widely used in weather forecasting centers. The digital filter was found to control high-frequency noise when implemented as a strong or as a weak constraint in the context of a global shallow water model. Implementation of a strong constraint did not result in a recovery of small scales although some recovery of intermediate scales did occur. Implementation of a weak constraint as a penalty method with a single fixed value of the penalty parameter resulted in analyses that were smooth, but depended upon the choice of the parameter. With a parameter value that was too large, the divergent kinetic energy spectrum of the analysis was excessively damped in the large scales. The rotational kinetic energy spectrum was also affected by the choice of penalty parameter. Both types of constraint were found to adequately control gravity wave noise although caution is advised in choosing the penalty parameter for the simple penalty term method." @default.
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• W2131036706 date "2000-07-01" @default.
• W2131036706 modified "2023-09-29" @default.
• W2131036706 title "Four-Dimensional Variational Data Assimilation with Digital Filter Initialization" @default.
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• W2131036706 doi "https://doi.org/10.1175/1520-0493(2000)128<2491:fdvdaw>2.0.co;2" @default.
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