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4.3.44. Snow

Parameters:

water_holding_capacity_max

Maximum water holding capacity of snow

Unit:

mm

Default:

0.1

water_holding_capacity_min

Minimum water holding capacity of snow

Unit:

mm

Default:

0.05

narp_emissivity_snow

Snow surface emissivity used in the NARP net all-wave radiation scheme

Unit:

dimensionless

Example:

0.99

temperature_rain_snow_threshold

Temperature threshold below which precipitation falls as snow rather than rain

Unit:

degC

Default:

None (optional)

precipitation_threshold_albedo_reset

Precipitation threshold above which snow albedo resets (cf. aging)

Unit:

mm

Example:

0.1

snow_albedo_max

Maximum snow albedo

Unit:

dimensionless

Example:

0.85

snow_albedo_min

Minimum snow albedo

Unit:

dimensionless

Example:

0.4

snow_density_min

Minimum snow density

Unit:

kg m^-3

Default:

None (optional)

snow_density_max

Maximum snow density

Unit:

kg m^-3

Default:

None (optional)

snow_depth_limit_building

Maximum snow depth limit on buildings

Unit:

m

Example:

0.1

snow_depth_limit_paved

Maximum snow depth limit on paved surfaces

Unit:

m

Example:

0.1

snow_profile_24hr

24-hour snow profile

The snow_profile_24hr parameter group is defined by the Hourly Profile structure.

tau_cold_snow

Time constant for snow albedo aging in cold snow

Unit:

dimensionless

Default:

0.018

tau_melting_snow

Time constant for snow albedo aging in melting snow

Unit:

dimensionless

Default:

0.11

tau_refreezing_snow

Time constant for snow albedo aging in refreezing snow

Unit:

dimensionless

Example:

0.05

temperature_melt_factor

Hourly temperature melt factor of snow

Unit:

mm K^-1 h^-1

Default:

0.12

radiation_melt_factor

Hourly radiation melt factor of snow

Unit:

mm W^-1 m² h^-1

Default:

0.0016

ohm_threshold_summer_winter

Summer/winter threshold based on temperature for the snow surface’s OHM calculation

Unit:

degC

Example:

10.0

ohm_threshold_wet_dry

Soil moisture threshold determining whether wet/dry OHM coefficients are applied to the snow surface

Unit:

dimensionless

Example:

0.9

ohm_coef

OHM coefficients for the snow surface (df_state surface index 7)

The ohm_coef parameter group is defined by the Seasonal/Wetness OHM Coefficients structure.

ref

The ref parameter group is defined by the Reference Info structure.