Dear CF Mailing List: Robert Pincus and I have been drafting a CMIP6 new variable request in support of diagnostics for the Radiative Forcing Model Intercomparison Project. One of the goals of this project is to test the instantaneous radiative forcing calculated by the CMIP models against benchmark line-by-line radiative transfer calculations. In order to achieve that goal, we will need the spatial and temporal distribution of spectrally-resolved aerosol optical properties, incoming solar insolation, and direct and diffuse surface albedo from each model as inputs to the benchmark calculations. Therefore, we propose to include the following CF Standard Names:
1. We propose using a CF standard name of "surface_spectral_ hemispherical_reflectance_of_diffuse_shortwave_radiation" for surface spectrally-resolved diffuse albedo in the interests of specifying the surface boundary condition for the line-by-line radiative transfer benchmark calculations. In our original request, this variable was specified by the Short name "albdiff". 2. Similarly, we propose using a CF standard name of "surface_spectral_ hemispherical_reflectance_of_direct_shortwave_radiation" for surface spectrally-resolved direct albedo, in the interests of specifying the surface boundary condition for the line-by-line radiative transfer benchmark calculations. In our original request, this variable was specified by the Short name "albdir". 3. We propose using a CF standard name of "toa_incoming_shortwave_flux_per_unit_wavelength" for spectrally-resolved top-of-atmosphere downwelling shortwave flux, in the interests of specifying the top-of-atmosphere boundary condition for the line-by-line radiative transfer benchmark calculations. In our original request, this variable was specified by the Short name "sol". 4. We propose using a CF standard name of "volume_spectral_extinction_ coefficient_in_air_due_to_ambient_aerosol_particles" or " spectral_volume_extinction_coefficient_in_air_due_to_ ambient_aerosol_particles" to specify the aerosol optical property of extinction for our benchmark radiative transfer calculations. We chose this name to indicate that this quantity can vary spectrally and thus is distinct from the existing variable "volume_extinction_ coefficient_in_air_due_to_ambient_aerosol". In our original request, this variable was specified by the Short name "aerext" 5. We propose using a CF standard name of "volume_spectral_single_ scattering_albedo_in_air_due_to_ambient_aerosol_particles" to specify the aerosol optical property of single-scattering albedo (ratio of scattering to extinction) for our benchmark radiative transfer calculations. However, if the variable with short name "aerext" is "spectral_volume_extinction_ coefficient_in_air_due_to_ambient_aerosol_particles", then we would propose naming this variable "spectral_volume_single_scattering_albedo_in_air_due_ to_ambient_aerosol_particles". In our original request, this variable was specified by the Short name "aerssa" 6. We propose using a CF standard name of "volume_spectral_asymmetry_ factor_in_air_due_to_ambient_aerosol_particles" to specify the aerosol optical property of asymmetry factor (ratio of forward to backward scattered energy) for our benchmark radiative transfer calculations. If the variable with short name "aerext" is "spectral_volume_extinction_ coefficient_in_air_due_to_ambient_aerosol_particles", then we would propose naming this variable "spectral_volume_asymmetry_ factor_in_air_due_to_ambient_aerosol_particles". In our original request, this variable was specified by the Short name "aerasym". We would like your feedback on this new variable request, so please don't hesitate to contact me with any questions or comments. Thanks so much, Dan -- Daniel Feldman, Ph.D. Geological Research Scientist Earth Sciences Division Lawrence Berkeley National Laboratory One Cyclotron Road - MS 74R316C Berkeley, California 94720 Phone: 510-495-2171 Fax: 510-486-7775 [email protected] http://esd.lbl.gov/about/staff/danielfeldman/
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