RRTMGP-Fortran

These pages provide a programmer's view of the Fortran user interface to RRTMGP.

RRTMGP provides a class ty_gas_optics_rrtmgp that implements the gas_optics() and other procedure(s) defined by the ty_gas_optics abstract class. The class is used to compute the spectrally-varying optical properties of the gaseous atmosphere given temperature, pressure, and gas concentrations. Each instance of the variable is "loaded" with data from netCDF files in the $RRTMGP_DATA directory. Depending on the data provided the variable can be used or radiation emitted by the atmosphere and surface ("longwave") of for for radiation emitted by the planet's star ("shortwave").

The class implements both the longwave/internal sources and shortwave/external sources versions of the gas_optics procedure. The longwave version reports Planck sources at layer centers and layer interfaces (levels) while the shortwave version reports the spectrally-varying stellar radiation Calling the longwave routine (by providing the longwave-relevant arguments) when the variable has been initialized with shortwave data triggers a run-time error.

The user interface uses the ty_gas_concs type to represent the volume mixing ratios needed as input. Output suitable for scattering emission, two-stream, or multi-stream calculations are provided depending on which sub-class of RTE's ty_optical_props_arry are provided. Planck source functions, if requested, are reported in a variable of type ty_source_func_lw.

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