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 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…