The AFGL Spectral Model of the Moist Global Atmosphere PDF Download
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Author: Stephen Brenner
Publisher:
ISBN:
Category : Atmosphere
Languages : en
Pages : 70
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Book Description
The baseline version of the AFGL model of the moist global atmosphere is described in detail. The numerical methods include spectral representation in the horizontal, the Arakawa vertical differencing scheme, and the semi-implicit time scheme. For this version, the pre- and postprocessing, the nonlinear normal mode initialization and the parameterized boundary layer processes and moisture physics are adapted from the NMC spectral model. A series of test forecasts indicate that the model performance is comparable to that of similar large-scale models.
Author: Stephen Brenner
Publisher:
ISBN:
Category : Atmosphere
Languages : en
Pages : 70
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Book Description
The baseline version of the AFGL model of the moist global atmosphere is described in detail. The numerical methods include spectral representation in the horizontal, the Arakawa vertical differencing scheme, and the semi-implicit time scheme. For this version, the pre- and postprocessing, the nonlinear normal mode initialization and the parameterized boundary layer processes and moisture physics are adapted from the NMC spectral model. A series of test forecasts indicate that the model performance is comparable to that of similar large-scale models.
Author: Stephen Brenner
Publisher:
ISBN:
Category : Atmosphere
Languages : en
Pages : 0
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Book Description
The baseline version of the AFGL model of the moist global atmosphere is described in detail. The numerical methods include spectral representation in the horizontal, the Arakawa vertical differencing scheme, and the semi-implicit time scheme. For this version, the pre- and postprocessing, the nonlinear normal mode initialization and the parameterized boundary layer processes and moisture physics are adapted from the NMC spectral model. A series of test forecasts indicate that the model performance is comparable to that of similar large-scale models.
Author: Stephen Brenner
Publisher:
ISBN:
Category :
Languages : en
Pages : 63
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Book Description
The baseline version of the AFGL model of the moist global atmosphere is described in detail. The numerical methods include spectral representation in the horizontal, the Arakawa vertical differencing scheme, and the semi-implicit time scheme. For this version, the pre- and postprocessing, the nonlinear normal mode initialization and the parameterized boundary layer processes and moisture physics are adapted from the NMC spectral model. A series of test forecasts indicate that the model performance is comparable to that of similar large-scale models.
Author: Donald C. Norquist
Publisher:
ISBN:
Category : Long-range weather forecasting
Languages : en
Pages : 168
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Book Description
Author:
Publisher:
ISBN:
Category : Meteorology
Languages : en
Pages : 1084
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 808
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 280
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Author: Stephen Brenner
Publisher:
ISBN:
Category : Atmospheric circulation
Languages : en
Pages : 84
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Book Description
The flexible resolution/truncation baseline version of the AFGL global spectral model as adapted to the CRAY-1 is described. A series of low-resolution (6 layer, rhomboidal 15) and high-resolution (12 layer, rhomboidal 30) forecasts were run and compared to test the performance of the model. In general, higher resolution resulted in improved forecast skill in the 24-to-96-hour range. The only exception to this is the humidity forecast, which shows minimal skill. This characteristic is rather insensitive to the resolution partly because of the poor quality of analyzed humidity fields used for initial data and verification. The original gridded (2.5 X 2.5 deg) topography has been replaced by a smoothed terrain field that has been passed through a nine-point smoother, interpolated to the model's Gaussian grid, and then spectrally truncated. Finally, the effects of initialization have been studied by comparing a series of forecasts subjected to several initialization methods. For forecasts beyond 24 hours, the model is able to supress spurious gravity waves through the combined effects of the semi-implicit time scheme and the subgrid scale diffusion. The impact of normal mode initialization is seen mainly in the very short-range forecasts (less than 24 hours) and is thus important for providing smooth first-guess fields for the analysis/data assimilation cycle. Keywords: Atmospheric models; Spectral models; Weather forecasting; Numerical weather prediction; Global atmospheric circulation.
Author: Kuo-Nan Liou
Publisher:
ISBN:
Category : Atmospheric circulation
Languages : en
Pages : 64
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Book Description
Parameterization programs involving infrared and solar radiation transfer in clear and cloudy atmospheres containing high and low cloud systems are described in this report. We document in detail the physical concepts and basic parameterization equations used for the computation of infrared and solar fluxes in clear and cloudy atmospheres along with the verification of various parametrization programs. In addition, we illustrate some preliminary results of the global distributions of the cloud and radiation budget generated from the AFGL model with the incorporation of the present radiation-cloud parameterization programs. Finally, we provide a description of the radiation parameterization computer programs including the programming interface with the AFGL six-layer general circulation model. (Author).
Author: United States. National Environmental Satellite, Data, and Information Service. Library and Information Services Division
Publisher:
ISBN:
Category :
Languages : en
Pages : 606
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Book Description
