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Abstract:
Dynamic normal mode initialization (DNI) is applied to low and high resolution versions of the AFGL global spectral mode. This scheme is tested against the operational nonlinear normal mode initialization (NMI) procedure using both adiabatic and diabatic forms of the model tendencies. The DNI-based forecasts are comparable in accuracy to the NMI-based forecasts, with small differences between the adiabatic and diabatic versions of each. DNI initial conditions were somewhat more damped in the divergence fields than were the NMI fields. This is believed to be due to the frequency response characteristics of the DNI's forward-backward time scheme, which tended to partially damp resolvable wavelengths. Keywords: Numerical weather predictions, Spectral atmospheric models, Weather forecasting, Normal modes, Global model initialization, Diabatic initialization. (kr)
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Final rept. Oct 87-Sep 88 |
| Pages: |
46 |
| Report Date: |
16 FEB 89 |
| Report Number: |
A021812 |
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