An Enhanced Global Spectral Model
Abstract
This study describes the development of a vectorized, multiprocessing global spectral model (GSM) with enhanced physical parameterizations. The starting point was the Phillips Laboratory GSM, in its GL90 version, containing an enhanced suite of physical parameterizations. The latitude tasking scheme for multiprocessing the loop over latitude in the calculation of the spectral tendencies and adjusted model variables was implemented, using the general truncation version of the hydrodynamics code. Wavenumber calculations were vectorized over wavenumber and multiprocessed over vertical level. All gridpoint calculations were vectorized over longitude, and the physics packages were brought into closer compliance with plug-compatibility rules. Speedups due to the optimization were demonstrated in single- and multiprocessing timing tests on a dedicated Cray 2 and Cray Y-MP. The enhanced physics GSM was evaluated in forecast tests, and contrasted with the simpler physics GSM used at GWC. Minimization of errors in the computation of the horizontal pressure gradient force was investigated, using a perturbation temperature instead of full temperature in the integration of the hydrostatic equation. Several schemes were tested in an idealized model atmosphere.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 27, 1992
- Accession Number
- ADA251242
Entities
People
- Jean-francois Louis
- Marina Zivkovic
- Ross Hoffman
- Thomas Nehrkorn
Organizations
- Atmospheric and Environmental Research, Inc