Evaluating Mesoscale NWP Models Using Kinetic Energy Spectra

Kinetic energy spectra derived from observations in the free atmosphere possess a wavenumber dependence of k -3 for large scales, characteristic of 2D turbulence, and transition to a k -5/3 dependence in the mesoscale. Kinetic energy spectra computed using mesoscale and experimental near-cloud-scale...

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Bibliographic Details
Published in:Monthly weather review 2004-12, Vol.132 (12), p.3019-3032
Main Author: Skamarock, W C
Format: Article
Language:English
Subjects:
Energy dissipation
Meteorology
Oceanography
Weather forecasting
Online Access:Get full text
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Summary:Kinetic energy spectra derived from observations in the free atmosphere possess a wavenumber dependence of k -3 for large scales, characteristic of 2D turbulence, and transition to a k -5/3 dependence in the mesoscale. Kinetic energy spectra computed using mesoscale and experimental near-cloud-scale NWP forecasts from the Weather Research and Forecast (WRF) model are examined, and it is found that the model-derived spectra match the observational spectra well, including the transition. The model spectra decay at the highest resolved wavenumbers compared with observations, indicating energy removal by the model's dissipation mechanisms. This departure from the observed spectra is used to define the model's effective resolution. Various dissipation mechanisms used in NWP models are tested in WRF model simulations to examine the mechanisms' impact on a model's effective resolution. The spinup of the spectra in forecasts is also explored, along with spectra variability in the free atmosphere and in forecasts under different synoptic regimes.
ISSN:0027-0644
1520-0493
DOI:10.1175/MWR2830.1