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The GFS Atmospheric Model description
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"The GFS Atmospheric Model
(status as of August 28, 2003)
Model Documentation:
Comprehensive documentation of the
1988 version of the model was provided by the NMC (now NCEP)
Development Division (1988), with subsequent model development summarized by
Kanamitsu(1989), Kanamitsu et al. (1991), Kalnay et al. (1990).
The documentation
NCEP MRF/RSM physics status as of August 1999 is located here .
This document containing radiation, surface layer, vertical diffusion, gravity wave drag,
convective precipitation, shallow convection, non-convective precipitation and
references updates the old 1988 documentation . In addition
Office Note # 424, New Global Orography Data Sets contains documentaiton of the
higher resolution orography for the MRF. The documentation of the GFS atmospheric model
as of 2003 is in NCEP Office Note # 442 .
Numerical/Computational Properties
Horizontal Representation
Spectral (spherical harmonic basis functions) with transformation to a Gaussian grid for
calculation of nonlinear quantities and physics.
Horizontal Resolution
Spectral triangular 254 (T254); Gaussian grid of 768X384, roughly equivalent to 0.5 X 0.5
degree latitude/longitude.
Vertical Domain
The vertical domain is from the earth's surface (sigma=1) to the top of the atmosphere (sigma=0).
This domain is divided into 64 layers with enhanced resolution near the bottom and the top.
For a surface pressure of 1000 hPa, the lowest atmospheric level is
at a pressure of about 997.3 hPa and the top level is at about 0.27 hPa.
Vertical Representation
Sigma coordinate. Lorenz grid. Quadratic-conserving finite difference scheme by Arakawa and
Mintz
(1974).
Vertical Resolution
64 unequally-spaced sigma levels. For a surface pressure of 1000 hPa, 15 levels are below 800
hPa, and 24 levels are above 100 hPa.
Computer/Operating System
IBM RS/"
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