Nonlinear Normal Mode Initialization with Physics

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Abstract
The nonlinear normal mode initialization with physics was applied for analyses in FGGE IIIb data of the European Center for Medium Range Weather Forecasting (ECMWF). A convergence of the iteration in the initialization was attained by modifying the correction increment for gravity modes in the Machenhauer scheme. The initialized field with physics contains reasonable magnitude of divergence wind as compared with the analysis. The difference of the initialized fields with and without physics is Described in some detail. The impact of initialization on the force is examined for some tropical disturbances. It has been found that the initialization affects the evolution of tropical disturbances through the change of convective heating in the forecast. Abstract The nonlinear normal mode initialization with physics was applied for analyses in FGGE IIIb data of the European Center for Medium Range Weather Forecasting (ECMWF). A convergence of the iteration in the initialization was attained by modifying the correction increment for gravity modes in the Machenhauer scheme. The initialized field with physics contains reasonable magnitude of divergence wind as compared with the analysis. The difference of the initialized fields with and without physics is Described in some detail. The impact of initialization on the force is examined for some tropical disturbances. It has been found that the initialization affects the evolution of tropical disturbances through the change of convective heating in the forecast.

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