6.12. misc_params.nml

This file contains five namelists called JULES_SURF_PARAM, JULES_CSMIN, JULES_AERO, JULES_SEED and JULES_SIGM that are used to set various parameters not set elsewhere.

HCTN24 and 30 refer to Hadley Centre technical notes 24 and 30, available from the Met Office Library.

6.12.1. JULES_SURF_PARAM namelist members

JULES_SURF_PARAM::hleaf

Type:real Default:5.7e4

Specific heat capacity of leaves (J K^-1 per kg carbon).

See HCTN30 p6.

JULES_SURF_PARAM::hwood

Type:real Default:1.1e4

Specific heat capacity of wood (J K^-1 per kg carbon).

See HCTN30 p6.

JULES_SURF_PARAM::beta1

Type:real Default:0.83

Coupling coefficient for co-limitation in photosynthesis model.

See Cox et al. (1999), Eq.61.

JULES_SURF_PARAM::beta2

Type:real Default:0.93

Coupling coefficient for co-limitation in photosynthesis model.

See Cox et al. (1999), Eq.61.

JULES_SURF_PARAM::fwe_c3

Type:real Default:0.5

Constant in expression for limitation of photosynthesis by transport of products, for C3 plants.

See Cox et al. (1999) Eq.60.

JULES_SURF_PARAM::fwe_c4

Type:real Default:20000.0

Constant in expression for limitation of photosynthesis by transport of products, for C4 plants.

See Cox et al. (1999) Eq.60.

JULES_SURF_PARAM::q10_leaf

Type:real Default:2.0

Q10 factor for plant respiration.

See Cox et al. (1999) Eq.66.

JULES_SURF_PARAM::q10_soil

Type:real Default:2.0

Q10 factor for soil respiration.

Only used if l_q10 = TRUE. See HCTN24 Eq.17.

JULES_SURF_PARAM::kaps

Type:real Default:0.5e-8

Specific soil respiration rate at 25 degC and optimum soil moisture (s^-1).

Only used if not using TRIFFID (l_triffid = FALSE). See HCTN24 Eq.16.

JULES_SURF_PARAM::kaps_roth

Type:real(4) Default:3.22e-7, 9.65e-9, 2.12e-8, 6.43e-10

Specific soil respiration rate for the RothC submodel for each soil carbon pool.

Only used if using the TRIFFID vegetation model (l_triffid = TRUE), in which case soil carbon is modelled using four pools (biomass, humus, decomposable plant material, resistant plant material).

JULES_SURF_PARAM::z0miz

Type:real Default:1.0e-1

Roughness length for heat, moisture and momentum over the Marginal Ice Zone (m).

JULES_SURF_PARAM::z0sice

Type:real Default:3.0e-3

Roughness length for heat, moisture and momentum over sea-ice (m).

JULES_SURF_PARAM::z0h_z0m_miz

Type:real Default:1.0

Ratio of thermal to momentum roughness lengths for marginal ice.

JULES_SURF_PARAM::z0h_z0m_sice

Type:real Default:1.0

Ratio of thermal to momentum roughness lengths for sea ice.

JULES_SURF_PARAM::emis_sea

Type:real Default:1.0

Emissivity of open sea.

JULES_SURF_PARAM::emis_sice

Type:real Default:1.0

Emissivity of sea-ice.

6.12.2. JULES_CSMIN namelist members

JULES_CSMIN::cs_min

Type:real Default:1.0e-6

Minimum allowed soil carbon (kg m^-2).

6.12.3. JULES_AERO namelist members

JULES_AERO::co2_mmr

Type:real Default:5.241e-4

Concentration of atmospheric CO2, expressed as a mass mixing ratio.

6.12.4. JULES_SEED namelist members

JULES_SEED::frac_min

Type:real Default:1.0e-6

Minimum fraction that a PFT is allowed to cover if TRIFFID is used.

JULES_SEED::frac_seed

Type:real Default:0.01

Seed fraction for TRIFFID.

6.12.5. JULES_SIGM namelist members

JULES_SIGM::pow

Type:real Default:5.241e-4

Power in sigmodial function used to get competition coefficients.

See HCTN24 Eq.3.