NOGAPS (Numerical Operational Global Atmospheric Prediction System) Verification Using Spectral Components.

Abstract

In this study, one three-day and two five-day Numerical Operational Global Atmospheric Prediction System (NOGAPS), 500mb forecasts were spectrally verified. The wavenumber components of the observed and forecasts waves were grouped into planetary (wavenumbers 1-3), long (wavenumbers 5-7) and medium (wavenumbers 8-12) wavenumbers for verification. The observed and forecast trough-ridge (hovmoller) diagrams of longitude versus time for each group were analyzed for each case. In all three cases, the most serious errors occurred in the planetary waves where the model often forecast erroneously large or small amplitudes. The long waves were the most accurately forecast group both in amplitude and phase speed. The medium wave amplitudes were forecast too weak and phase speeds were consistantly too fast for this group. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1983
Accession Number
ADA129435

Entities

People

  • Peter A. Morse

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Cyber

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Amplitude
  • Complex Adaptive Systems
  • Coordinate Systems
  • Decomposition
  • Diagrams
  • Equations
  • Errors
  • Grids
  • Height
  • Intervals
  • Latitude
  • Longitude
  • Phase
  • Research Facilities
  • Weather Forecasting

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Atmospheric Science/Meteorology