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6.15. pft_params.nml

This file contains a single namelist called JULES_PFTPARM that sets time-and space-invariant parameters for plant functional types.

Note

If the crop model is on (i.e. ncpft > 0), the order of PFTs must be natural PFTs followed by crop PFTs.

6.15.1. JULES_PFTPARM namelist members

This namelist reads the values of parameters for each of the plant functional types (PFTs). These parameters are a function of PFT only. Parameters that also vary with time and location can be prescribed in prescribed_data.nml. Parameters that are only required if the dynamic vegetation (TRIFFID) or phenology sections are requested are read separately in triffid_params.nml. Every member must be given a value for every run.

The files given in the examples directory are a good starting point for setting up any JULES run, and in the majority of cases can be left untouched.

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

JULES_PFTPARM::canht_ft_io
Type:real(npft)
Default:None

The height of each PFT (m), also known as the canopy height.

The value read here is only used if TRIFFID is not active (l_triffid = FALSE).

Note

If TRIFFID is active, canopy height is a prognostic variable and its initial value is read in initial_conditions.nml.

JULES_PFTPARM::lai_io
Type:real(npft)
Default:None

The leaf area index (LAI) of each PFT.

The value read here is only used if phenology is not active (l_phenol = FALSE).

Note

If phenology is active, LAI is a prognostic variable and its initial value is read in initial_conditions.nml.

JULES_PFTPARM::c3_io
Type:integer(npft)
Default:None

Flag indicating whether PFT is C3 type.

  1. Not C3 (i.e. C4).
  2. C3.
JULES_PFTPARM::orient_io
Type:integer(npft)
Default:None

Flag indicating leaf angle distribution.

  1. Spherical.
  2. Horizontal.
JULES_PFTPARM::can_struct_a_io
Type:real(npft)
Default:None

Canopy structure factor (dimensionless). can_struct_a_io=1.0 indicates a structurally homogeneous canopy. Corresponds to the structure factor Zeta in Pinty et al 2006 except assumed not to vary with zenith angle i.e. b=0. The canopy structure factor has no effect if can_rad_mod = 1.

See also

References:

  • Pinty, B., T. Lavergne, R. E. Dickinson, J.-L. Widlowski, N. Gobron, and M. M. Verstraete (2006), Simplifying the interaction of land surfaces with radiation for relating remote sensing products to climate models, J. Geophys. Res., 111, D02116, doi:10.1029/2005JD005952.
JULES_PFTPARM::a_wl_io
Type:real(npft)
Default:None

Allometric coefficient relating the target woody biomass to the leaf area index (kg carbon m-2).

JULES_PFTPARM::a_ws_io
Type:real(npft)
Default:None

Woody biomass as a multiple of live stem biomass.

JULES_PFTPARM::albsnc_max_io
Type:real(npft)
Default:None

Snow-covered albedo for large leaf area index.

Only used if l_snow_albedo = FALSE. See HCTN30 Eq.2.

JULES_PFTPARM::albsnc_min_io
Type:real(npft)
Default:None

Snow-covered albedo for zero leaf area index.

Only used if l_snow_albedo = FALSE. See HCTN30 Eq.2.

JULES_PFTPARM::albsnf_max_io
Type:real(npft)
Default:None

Snow-free albedo for large LAI.

Only used if l_spec_albedo = FALSE. See HCTN30 Eq.1.

JULES_PFTPARM::albsnf_maxu_io
Type:real(npft)
Default:None

Upper bound for the snow-free albedo for large LAI, when scaled to match input obs.

Only used if l_spec_albedo = FALSE and l_albedo_obs = TRUE.

JULES_PFTPARM::albsnf_maxl_io
Type:real(npft)
Default:None

Lower bound for the snow-free albedo for large LAI, when scaled to match input obs.

Only used if l_spec_albedo = FALSE and l_albedo_obs = TRUE.

JULES_PFTPARM::alpha_io
Type:real(npft)
Default:None

Quantum efficiency (mol CO2 per mol PAR photons).

JULES_PFTPARM::alnir_io
Type:real(npft)
Default:None

Leaf reflection coefficient for NIR. See HCTN30 Table 3.

Used when l_spec_albedo = TRUE.

JULES_PFTPARM::alniru_io
Type:real(npft)
Default:None

Upper limit for the leaf reflection coefficient for NIR, when l_albedo_obs = TRUE and l_spec_albedo = TRUE.

JULES_PFTPARM::alnirl_io
Type:real(npft)
Default:None

Lower limit for the leaf reflection coefficient for NIR, when l_albedo_obs = TRUE and l_spec_albedo = TRUE.

JULES_PFTPARM::alpar_io
Type:real(npft)
Default:None

Leaf reflection coefficient for VIS (photosyntehtically active radiation). See HCTN30 Table 3.

Used when l_spec_albedo = TRUE.

JULES_PFTPARM::alparu_io
Type:real(npft)
Default:None

Upper limit for the leaf reflection coefficient for VIS, when l_albedo_obs = TRUE and l_spec_albedo = TRUE.

JULES_PFTPARM::alparl_io
Type:real(npft)
Default:None

Lower limit for the leaf reflection coefficient for VIS, when l_albedo_obs = TRUE and l_spec_albedo = TRUE.

JULES_PFTPARM::b_wl_io
Type:real(npft)
Default:None

Allometric exponent relating the target woody biomass to the leaf area index. This is 5/3 in HCTN24 Eq.8.

JULES_PFTPARM::catch0_io
Type:real(npft)
Default:None

Minimum canopy capacity (kg m-2).

This is the minimum amount of water that can be held on the canopy. See HCTN30 p7.

JULES_PFTPARM::dcatch_dlai_io
Type:real(npft)
Default:None

Rate of change of canopy capacity with LAI (kg m-2).

Canopy capacity is calculated as catch0 + dcatch_dlai*lai. See HCTN30 p7.

JULES_PFTPARM::dgl_dm_io
Type:real(npft)
Default:None

Rate of change of leaf turnover rate with moisture availability.

JULES_PFTPARM::dgl_dt_io
Type:real(npft)
Default:None

Rate of change of leaf turnover rate with temperature (K-1).

This is 9 in HCTN24 Eq.10.

JULES_PFTPARM::dqcrit_io
Type:real(npft)
Default:None

Critical humidity deficit (kg H2O per kg air).

JULES_PFTPARM::dz0v_dh_io
Type:real(npft)
Default:None

Rate of change of vegetation roughness length for momentum with height.

Roughness length is calculated as dz0v_dh * canht_ft. See HCTN30 p5.

JULES_PFTPARM::eta_sl_io
Type:real(npft)
Default:None

Live stemwood coefficient (kg C/m/LAI).

JULES_PFTPARM::fd_io
Type:real(npft)
Default:None

Scale factor for dark respiration. See HCTN 24 Eq. 56.

JULES_PFTPARM::fsmc_of_io
Type:real(npft)
Default:None

Moisture availability below which leaves are dropped.

JULES_PFTPARM::f0_io
Type:real(npft)
Default:None

CI / CA for DQ = 0. See HCTN 24 Eq. 32.

JULES_PFTPARM::g_leaf_0_io
Type:real(npft)
Default:None

Minimum turnover rate for leaves (/360days).

JULES_PFTPARM::glmin_io
Type:real(npft)
Default:None

Minimum leaf conductance for H2O (m s-1).

JULES_PFTPARM::infil_f_io
Type:real(npft)
Default:None

Infiltration enhancement factor.

The maximum infiltration rate defined by the soil parameters for the whole gridbox may be modified for each PFT to account for tile-dependent factors, such as macro-pores related to vegetation roots.

See HCTN30 p14 for full details.

JULES_PFTPARM::hw_sw_io
Type:real(npft)
Default:None

Ratio of N stem to N heartwood (kgN/kgN) from the TRY database.

Only used if l_trait_phys = T.

JULES_PFTPARM::kext_io
Type:real(npft)
Default:None

Light extinction coefficient - used with Beer’s Law for light absorption through tile canopies. See HCTN30 Eq.3.

JULES_PFTPARM::kpar_io
Type:real(npft)
Default:None

PAR Extinction coefficient (m2 leaf / m2 ground).

JULES_PFTPARM::lai_alb_lim_io
Type:real(npft)
Default:None

Minimum LAI permitted in calculation of the albedo in snow-free conditions.

JULES_PFTPARM::neff_io
Type:real(npft)
Default:None

Scale factor relating Vcmax with leaf nitrogen concentration. See HCTN 24 Eq. 51.

Only used if l_trait_phys = F.

JULES_PFTPARM::nl0_io
Type:real(npft)
Default:None

Top leaf nitrogen concentration (kg N/kg C).

Only used if l_trait_phys = F.

JULES_PFTPARM::nr_nl_io
Type:real(npft)
Default:None

Ratio of root nitrogen concentration to leaf nitrogen concentration.

JULES_PFTPARM::nr_io
Type:real(npft)
Default:None

Root nitrogen concentration (kgN/kgC). Only used if l_trait_phys = T.

JULES_PFTPARM::ns_nl_io
Type:real(npft)
Default:None

Ratio of stem nitrogen concentration to leaf nitrogen concentration.

JULES_PFTPARM::nsw_io
Type:real(npft)
Default:None

Stemwood nitrogen concentration (kgN/kgC). Only used if l_trait_phys = T.

JULES_PFTPARM::hw_sw_io
Type:real(npft)
Default:None

Ratio of Heartwood to Stemwood Nitrogen Concentration (typically 0.5) Only used if l_trait_phys = T.

JULES_PFTPARM::omega_io
Type:real(npft)
Default:None

Leaf scattering coefficient for PAR.

Used when l_spec_albedo = TRUE.

JULES_PFTPARM::omegau_io
Type:real(npft)
Default:None

Upper limit for the leaf scattering coefficient for PAR, when l_albedo_obs = TRUE and l_spec_albedo = TRUE.

JULES_PFTPARM::omegal_io
Type:real(npft)
Default:None

Lower limit for the leaf scattering coefficient for PAR, when l_albedo_obs = TRUE and l_spec_albedo = TRUE.

JULES_PFTPARM::omnir_io
Type:real(npft)
Default:None

Leaf scattering coefficient for NIR.

Used when l_spec_albedo = TRUE.

JULES_PFTPARM::omniru_io
Type:real(npft)
Default:None

Upper limit for the leaf scattering coefficient for NIR, when l_albedo_obs = TRUE and l_spec_albedo = TRUE.

JULES_PFTPARM::omnirl_io
Type:real(npft)
Default:None

Lower limit for the leaf scattering coefficient for NIR, when l_albedo_obs = TRUE and l_spec_albedo = TRUE.

JULES_PFTPARM::r_grow_io
Type:real(npft)
Default:None

Growth respiration fraction.

JULES_PFTPARM::fsmc_mod_io
Type:integer(npft)
Default:None

Switch for method of weighting the contribution that different soil layers make to the soil moisture availability factor fsmc.

  1. (recommended) Calculate fsmc in each soil layer and take a weighted average, using the fraction of roots in each layer as weights. Root distribution e-folding depth is given by rootd_ft_io.
  2. Calculate fsmc using average properties for the root zone. Depth of root zone is given by rootd_ft_io. This is not currently allowed if layered soil C (l_layeredc = TRUE) and the RothC model are selected (soil_bgc_model = 2) because of unplanned effects on litter inputs.
JULES_PFTPARM::psi_open_io
Type:real(npft)
Default:None

Soil potential above which the soil moisture stress factor on vegetation (fsmc) is one. Unit: Pa. Allowed range: must be negative. Only used if l_use_pft_psi = T.

JULES_PFTPARM::psi_close_io
Type:real(npft)
Default:None

Soil potential below which the soil moisture stress factor on vegetation (fsmc) is zero. Unit: Pa. Allowed range: must be negative. Only used if l_use_pft_psi = T.

JULES_PFTPARM::rootd_ft_io
Type:real(npft)
Default:None

Parameter determining the root depth (m).

If fsmc_mod_io = 0, an exponential root distribution with depth is assumed, with e-folding depth rootd_ft (see HCTN30 Eq.32). Note that this means that generally some of the roots exist at depths greater than rootd_ft. If fsmc_mod_io = 1, rootd_ft is the total depth of the root zone.

JULES_PFTPARM::fsmc_p0_io
Type:real(npft)
Default:None

Pft-dependent parameter governing the threshold at which the plant starts to experience water stress due to lack of water in the soil. Only used if l_use_pft_psi = F. The volumetric soil moisture content (m3 water per m3 soil) at which the plant starts to become water stressed is sm_wilt+(sm_crit-sm_wilt)*(1-fsmc_p0) (see JULES_SOIL_PROPS for a description of sm_wilt and sm_crit).

JULES_PFTPARM::sigl_io
Type:real(npft)
Default:None

Specific density of leaf carbon (kg C/m2 leaf).

Only used if l_trait_phys = F.

JULES_PFTPARM::tleaf_of_io
Type:real(npft)
Default:None

Temperature below which leaves are dropped (K).

JULES_PFTPARM::tlow_io
Type:real(npft)
Default:None

Lower temperature for photosynthesis (deg C).

JULES_PFTPARM::tupp_io
Type:real(npft)
Default:None

Upper temperature for photosynthesis (deg C).

JULES_PFTPARM::emis_pft_io
Type:real(npft)
Default:None

Surface emissivity.

JULES_PFTPARM::z0hm_pft_io
Type:real(npft)
Default:None

Ratio of the roughness length for heat to the roughness length for momentum.

This is generally assumed to be 0.1. See HCTN30 p6. Note that this is the ratio of the roughness length for heat to that for momentum. It does not alter the roughness length for momentum, which is calculated using canht_ft_io and dz0v_dh_io.

JULES_PFTPARM::z0hm_classic_pft_io
Type:real(npft)
Default:None

Ratio of the roughness length for heat to the roughness length for momentum for the CLASSIC aerosol scheme only.

Note

This makes no difference to the model when running standalone, and is only required to keep the standalone and UM interfaces consistent.

JULES_PFTPARM::fl_o3_ct_io
Type:real(npft)
Default:None

Critical flux of O3 to vegetation (mmol m-2 s-1).

JULES_PFTPARM::dfp_dcuo_io
Type:real(npft)
Default:None

Fractional reduction of photosynthesis with the cumulative uptake of O3 by leaves (mmol m-2).

JULES_PFTPARM::ief_io
Type:real(npft)
Default:None

Isoprene Emission Factor (μg g-1 h-1).

JULES_PFTPARM::tef_io
Type:real(npft)
Default:None

Monoterpene Emission Factor (μg g-1 h-1).

JULES_PFTPARM::mef_io
Type:real(npft)
Default:None

Methanol Emission Factor (μg g-1 h-1).

JULES_PFTPARM::aef_io
Type:real(npft)
Default:None

Acetone Emission Factor (μg g-1 h-1).

JULES_PFTPARM::ci_st_io
Tybe:real(npft)
Default:None

Leaf-internal CO2concentration at standard conditions (Pa),

Note

Standard conditions are: T = 303.15K, p = 1013.25 hPa, atmospheric CO2 = 370 ppmv, PAR = 1000 μmol m-2 s-1.

JULES_PFTPARM::gpp_st_io
Tybe:real(npft)
Default:None

Gross primary production (GPP) at standard conditions (kgC m-2 s-1),

Note

Standard conditions are: T = 303.15K, p = 1013.25 hPa, atmospheric CO2 = 370 ppmv, PAR = 1000 μmol m-2 s-1.

JULES_PFTPARM::nmass_io
Type:real(npft)
Default:None

Top leaf nitrogen content per unit mass (kgN kgLeaf-1).

Only used if l_trait_phys = T.

JULES_PFTPARM::lma_io
Type:real(npft)
Default:None

Leaf mass per unit area (kgLeaf m-2).

Only used if l_trait_phys = T.

JULES_PFTPARM::vint_io
Type:real(npft)
Default:None

There is a linear relationship between Vcmax and Narea. Previously Vcmax was calculated as the product of nl0 and neff.

This is now replaced by a linear regression based on data reported in Kattge et al. 2009. Vint is the y-intercept, vsl is the slope.

Units: μmol CO2 m-2 s-1.

Only used if l_trait_phys = T.

JULES_PFTPARM::vsl_io
Type:real(npft)
Default:None

Slope in the linear regression between Vcmax and Narea.

Units: μmol CO2 gN-1 s-1.

Only used if l_trait_phys = T.

JULES_PFTPARM::kn_io
Type:real(npft)
Default:None.

Parameter for decay of nitrogen through the canopy, as a function of layers. Only used if can_rad_mod = 4 or 5.

JULES_PFTPARM::knl_io
Type:real(npft)
Default:None.

Parameter for decay of nitrogen through the canopy, as a function of LAI. Only used if can_rad_mod = 6.

JULES_PFTPARM::q10_leaf_io
Type:real(npft)
Default:None.

Q10 factor for plant respiration.

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

Note

Was previously a single parameter but now can have PFT-dependent values.

JULES_PFTPARM::fef_co2_io
Type:real(npft)
Default:None

Fire CO2 Emission Factor (g kg-1).

JULES_PFTPARM::fef_co_io
Type:real(npft)
Default:None

Fire CO Emission Factor (g kg-1).

JULES_PFTPARM::fef_ch4_io
Type:real(npft)
Default:None

Fire CH4 Emission Factor (g kg-1).

JULES_PFTPARM::fef_nox_io
Type:real(npft)
Default:None

Fire NOx Emission Factor (g kg-1).

JULES_PFTPARM::fef_so2_io
Type:real(npft)
Default:None

Fire SO2 Emission Factor (g kg-1).

JULES_PFTPARM::fef_oc_io
Type:real(npft)
Default:None

Fire OC Emission Factor (g kg-1).

JULES_PFTPARM::fef_bc_io
Type:real(npft)
Default:None

Fire BC Emission Factor (g kg-1).

JULES_PFTPARM::ccleaf_min_io
Type:real(npft)
Default:None

Leaf minimum combustion completeness.

JULES_PFTPARM::ccleaf_max_io
Type:real(npft)
Default:None

Leaf maximum combustion completeness.

JULES_PFTPARM::ccwood_min_io
Type:real(npft)
Default:None

Wood minimum combustion completeness.

JULES_PFTPARM::ccwood_max_io
Type:real(npft)
Default:None

Wood maximum combustion completeness.

JULES_PFTPARM::avg_ba_io
Type:real(npft)
Default:None

Average PFT Burnt Area per fire (m:sup‘2’).

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