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Solar and thermal infrared radiation transfer schemes in the NCEP Global Forecast System (GFS)
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2023
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[PDF-1.00 MB]
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Description:This technical memorandum is intended to document the radiative transfer scheme used in the current NCEP’s models. Sections 2-5 review the fundamentals of radiative transfer calculations for atmospheric model applications. Specifically, section 2 gives the basic equation of the radiative transfer in the plane-parallel atmosphere, section 3 and 4 review the approximations for solar and thermal infrared radiation transfer. Section 5 discusses the radiative flux calculation for partially cloudy sky. Sections 2-5 are very important to understand the GFS radiation scheme. Section 6 introduces the RRTM, RRTMG and RRTMGP radiative transfer models. Section 7 discusses the climate data needed for radiative transfer calculation. Section 8 describes the input variables for the GFS radiative transfer modules. Finally, the GFS radiation scheme FORTRAN code structure is explained in section 9.
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Rights Information:CC0 Public Domain
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Compliance:Submitted
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