6.19. crop_params.nml

This file contains a single namelist called JULES_CROPPARM that sets time- and space-invariant parameters for each crop type.

6.19.1. JULES_CROPPARM namelist members

This namelist reads the values of parameters for each of the crop functional types. These parameters are a function of crop pft only. These parameters are only required if ncpft > 0. The crop pfts should be in the same order as in pft_params.nml.

See also

References:

• Osborne et al, JULES-crop: a parametrisation of crops in the Joint UK Land Environment Simulator, Geosci. Model Dev., 8, 1139-1155, 2015.

Parameters introduced after the Osborne et al 2015 paper are described in the appendix of

• Williams et al, Evaluation of JULES-crop performance against site observations of irrigated maize from Mead, Nebraska, Geosci. Model Dev., 10, 1291-1320, 2017.

JULES_CROPPARM::t_bse_io

Type:real(ncpft) Default:None

Base temperature (K).

JULES_CROPPARM::t_opt_io

Type:real(ncpft) Default:None

Optimum temperature (K).

JULES_CROPPARM::tmax_io

Type:real(ncpft) Default:None

Maximum temperature (K).

JULES_CROPPARM::tt_emr_io

Type:real(ncpft) Default:None

Thermal time between sowing and emergence (deg Cd).

JULES_CROPPARM::crit_pp_io

Type:real(ncpft) Default:None

Critical photoperiod (hours).

JULES_CROPPARM::pp_sens_io

Type:real(ncpft) Default:None

Sensitivity of development rate to photoperiod (hours^-1).

JULES_CROPPARM::rt_dir_io

Type:real(ncpft) Default:None

Coefficient determining relative growth of roots vertically and horizontally.

JULES_CROPPARM::alpha1_io

Type:real(ncpft) Default:None

Coefficient for determining partitioning.

JULES_CROPPARM::alpha2_io

Type:real(ncpft) Default:None

Coefficient for determining partitioning.

JULES_CROPPARM::alpha3_io

Type:real(ncpft) Default:None

Coefficient for determining partitioning.

JULES_CROPPARM::beta1_io

Type:real(ncpft) Default:None

Coefficient for determining partitioning.

JULES_CROPPARM::beta2_io

Type:real(ncpft) Default:None

Coefficient for determining partitioning.

JULES_CROPPARM::beta3_io

Type:real(ncpft) Default:None

Coefficient for determining partitioning.

JULES_CROPPARM::gamma_io

Type:real(ncpft) Default:None

Coefficient for determining specific leaf area (m² kg^-1).

JULES_CROPPARM::delta_io

Type:real(ncpft) Default:None

Coefficient for determining specific leaf area (m² kg^-1).

JULES_CROPPARM::remob_io

Type:real(ncpft) Default:None

Remobilisation factor. Fraction of stem growth partitioned to RESERVEC.

JULES_CROPPARM::cfrac_s_io

Type:real(npft) Default:None

Carbon fraction of dry matter for stems.

JULES_CROPPARM::cfrac_r_io

Type:real(ncpft) Default:None

Carbon fraction of dry matter for roots.

JULES_CROPPARM::cfrac_l_io

Type:real(ncpft) Default:None

Carbon fraction of dry matter for leaves.

JULES_CROPPARM::allo1_io

Type:real(ncpft) Default:None

Allometric coefficient relating STEMC to CANHT.

JULES_CROPPARM::allo2_io

Type:real(ncpft) Default:None

Allometric coefficient relating STEMC to CANHT.

JULES_CROPPARM::mu_io

Type:real(ncpft) Default:None

Allometric coefficient for calculation of senescence. MIN(mu_io * (dvi - sen_dvi_io) ** nu_io, 1.0) is the fraction of leaf carbon that is moved to the harvest pool per day once senescence has started.

JULES_CROPPARM::nu_io

Type:real(ncpft) Default:None

Allometric coefficient for calculation of senescence. See description for mu_io

JULES_CROPPARM::yield_frac_io

Type:real(ncpft) Default:None

Fraction of the harvest carbon pool converted to yield carbon (yield is the economically valuable component of the harvest pool e.g. kernel).

JULES_CROPPARM::initial_carbon_io

Type:real(ncpft) Default:None

Carbon in crop at emergence in kgC/m2.

JULES_CROPPARM::initial_c_dvi_io

Type:real(ncpft) Default:None

DVI at which the crop carbon is set to initial_carbon_io. Should be at emergence (0.0) or shortly after.

JULES_CROPPARM::sen_dvi_io

Type:real(ncpft) Default:None

DVI at which leaf senescence begins.

JULES_CROPPARM::t_mort_io

Type:real(ncpft) Default:None

Soil temperature (second level) at which to kill crop if DVI>1.