6.6. jules_radiation.nml

This file sets the radiation options. It contains one namelist called JULES_RADIATION.

6.6.1. JULES_RADIATION namelist members

JULES_RADIATION::l_cosz
Type:logical
Default:T

Switch for calculation of solar zenith angle.

TRUE
Calculate zenith angle.
FALSE
Assume constant zenith angle of zero, meaning sun is directly overhead.
JULES_RADIATION::l_spec_albedo
Type:logical
Default:F

Switch for albedo model.

TRUE
Use spectral albedo with VIS and NIR components.
FALSE
Use a single (averaged) waveband albedo.
JULES_RADIATION::l_spec_alb_bs
Type:logical
Default:F

Switch for albedo model, when spectral albedo is being used.

Requires l_spec_albedo = TRUE.

TRUE
Produces a single albedo for use by both the direct and diffuse beams (a ‘blue’ sky albedo). This currently copies the diffuse beam albedo for the direct beam.
FALSE
Produces both a direct (‘black’ sky) and a diffuse (‘white’ sky) albedo.
JULES_RADIATION::l_niso_direct
Type:logical
Default:F

Switch for using full non-isotropic expression for direct back-scattering in plant canopies.

Requires l_spec_albedo = TRUE.

TRUE
Use full non-isotropic expression for back-scattering in plant canopies.
FALSE
Use the original isotropic expression.
JULES_RADIATION::l_snow_albedo
Type:logical
Default:F

Switch for using prognostic snow properties in model albedo.

Requires l_spec_albedo = TRUE.

TRUE
Use prognostic snow properties for albedo.
FALSE
Calculate albedo of snow using only snow depth.
JULES_RADIATION::l_embedded_snow
Type:logical
Default:F

Switch to use embedded canopy model for calculation of snow albedo.

TRUE
Use the embedded canopy snow albedo model. This is excluive of l_snow_albedo.
FALSE
No effect.
JULES_RADIATION::l_mask_snow_orog
Type:logical
Default:F

Switch for orographic masking of snow.

TRUE
Include orographic masking of snow in calculating albedo.
FALSE
No effect.
JULES_RADIATION::l_albedo_obs
Type:logical
Default:F

Switch for applying a scaling factor to the albedo values, on tiles, so that the resultant aggregate albedo matches observations.

TRUE

Scale the albedo values on tiles.

Note

Observed albedo(s) must be prescribed in prescribed_data.nml.

FALSE
Do not scale the albedo values on tiles.
JULES_RADIATION::wght_alb
Type:real(4)
Default:MDI

Weights to form the overall albedo from its components.