6.4. jules_radiation.nml

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

6.4.1. JULES_RADIATION namelist members

JULES_RADIATION::l_cosz

Type:logical Default:T

Switch for calculation of solar zenith angle. For land points, this switch is only relevant if l_spec_albedo = TRUE.

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.