Initialization of a Barotropic Limited-Area Model Using the Laplace Transform Technique

Peter Lynch Royal Netherlands Meteorological Institute, De Bilt, The Netherlands

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Abstract

The Laplace transform technique of initialization is used to initialize the data for a barotropic forecasting model over a limited area. The initialization is successful in suppressing high-frequency oscillations during early forecast hours. It has negligible effect upon the resulting 24-hour forecast.

A variation of the linearization, wherein the Coriolis parameter is held constant, is investigated. It is found that the fields which result after a single nonlinear iteration of the modified scheme are almost identical to those resulting from the more general scheme.

Abstract

The Laplace transform technique of initialization is used to initialize the data for a barotropic forecasting model over a limited area. The initialization is successful in suppressing high-frequency oscillations during early forecast hours. It has negligible effect upon the resulting 24-hour forecast.

A variation of the linearization, wherein the Coriolis parameter is held constant, is investigated. It is found that the fields which result after a single nonlinear iteration of the modified scheme are almost identical to those resulting from the more general scheme.

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