Abstract
The requirement to modify meteorological analyses to avoid spurious high frequency oscillations in numerical forecasts has been known from the beginning of numerical weather prediction. The most popular method of initialization up to recently was normal mode initialization, or NMI (Machenhauer, 1977). This has been used in many NWP centres, and has performed satisfactorily. Its most natural context is for global models, for which the horizontal structure of the normal modes corresponds to the Hough functions, the eigenmodes of the Laplace Tidal Equations. For limited area models, normal modes can also be derived, but the lateral boundaries force the introduction of simplifying assumptions.
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© 2003 Springer Science+Business Media Dordrecht
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Lynch, P. (2003). Digital Filter Initialization. In: Swinbank, R., Shutyaev, V., Lahoz, W.A. (eds) Data Assimilation for the Earth System. NATO Science Series, vol 26. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0029-1_10
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DOI: https://doi.org/10.1007/978-94-010-0029-1_10
Publisher Name: Springer, Dordrecht
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