6.12. `jules_soil_ecosse.nml`¶

This file sets options and parameters for the ECOSSE model of soil biogeochemistry. It is used only if the ECOSSE model is chosen (soil_bgc_model = 3).

Warning

The ECOSSE model in JULES is still in development and is not fully functional in this version. The code is included to allow further development. Users should not try to use ECOSSE.

6.12.1. `JULES_SOIL_ECOSSE` namelist members¶

JULES_SOIL_ECOSSE::l_soil_n¶

Type:	logical
Default:	T

Switch to include soil nitrogen in ECOSSE.

TRUE: Model soil carbon and nitrogen.
FALSE: Model only soil carbon.

JULES_SOIL_ECOSSE::l_match_layers¶

Type:	logical
Default:	T

Switch to match ECOSSE soil C and N layers to those for soil moisture.

TRUE: Use the same layering as for soil moisture. The number of soil carbon layers will equal sm_levels, with layer thicknesses given by dzsoil_io.
FALSE: The number of layers will be specified by dim_cslayer and the thicknesses by dz_soilc_io.

JULES_SOIL_ECOSSE::dim_cslayer¶

Type:	integer
Permitted:	>= 1
Default:	None

The number of ECOSSE soil carbon layers. Not used if l_match_layers = TRUE. Despite the similar name, this parameter is unrelated to sclayer_dim_name.

JULES_SOIL_ECOSSE::dz_soilc_io¶

Type:	real(dim_cslayer)
Permitted:	> 0
Default:	None

Thicknesses of the ECOSSE soil carbon layers (m). Not used if l_match_layers = TRUE. In most cases the total depth must equal that of the soil moisture layers (see dzsoil_io). The exception is the case of a single layer, bulk model (dim_cslayer = 1), for which dz_soilc(1) is interpreted as the representative or averaging depth for the bulk layer (e.g. the temperature of the bulk model is taken as the average over this depth).

JULES_SOIL_ECOSSE::dt_soilc¶

Type:	REAL
Permitted:	>= `timestep_len`
Default:	`timestep_len`

The timestep length for ECOSSE (seconds). The main JULES timestep length timestep_len must be a multiple of this timestep length, so that ECOSSE is called on JULES timesteps. The TRIFFID timestep length triffid_period (converted to seconds) must also be a multiple of the ECOSSE timestep length.

JULES_SOIL_ECOSSE::l_driver_ave¶

Type:	logical
Default:	T

Switch controlling the averaging of the physical driving variables that are input to ECOSSE (e.g. soil temperature).

TRUE: Average the driving variables over the ECOSSE timestep length.
FALSE: Use instantaneous values of the driving variables at the time when ECOSSE is called.

JULES_SOIL_ECOSSE::plant_input_profile¶

Type:	INTEGER
Permitted:	1 or 2
Default:	1

Switch for the vertical distribution of litterfall inputs of C and N to the soil.

Possible values are:

Fraction pi_sfc_frac of inputs are distributed uniformly in a surface layer of depth pi_sfc_depth, the remainder are distributed according to the distribution of roots.
Inputs decrease exponentially with depth with decay constant tau_lit.

JULES_SOIL_ECOSSE::pi_sfc_frac¶

Type:	REAL
Default:	0.3

Fraction of plant litterfall that is added to the surface soil layer of depth pi_sfc_depth. Only used if plant_input_profile = 1.

JULES_SOIL_ECOSSE::pi_sfc_depth¶

Type:	REAL
Default:	0.1

Depth of soil over which fraction pi_sfc_frac of plant litterfall is added (m). Only used if plant_input_profile = 1.

JULES_SOIL_ECOSSE::temp_modifier¶

Type:	INTEGER
Permitted:	1 or 2
Default:	2

Switch for the form of the temperature rate modifier for decomposition.

Use a Q10 approach.
Use the RothC form of the modifier.

JULES_SOIL_ECOSSE::water_modifier¶

type: INTEGER

permitted: 1 or 2

default: 2

Switch for the form of the water rate modifier for decomposition and nitrification.

Use the JULES form of the modifier.
Use the RothC form of the modifier.

JULES_SOIL_ECOSSE::decomp_rate¶

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

Rate constant for decomposition of each soil carbon pool (s^-1).

Note that these default values are also those for use with the RothC model (kaps_roth).

JULES_SOIL_ECOSSE::decomp_ph_rate_min¶

Type:	REAL
Default:	0.2

Minimum allowed value of pH rate modifier for decomposition.

JULES_SOIL_ECOSSE::decomp_ph_min¶

Type:	REAL
Permitted:	decomp_ph_min <= decomp_ph_max
Default:	1.0

Soil pH below which rate of decomposition is minimum.

JULES_SOIL_ECOSSE::decomp_ph_max¶

Type:	REAL
Permitted:	decomp_ph_max >= decomp_ph_min
Default:	4.5

Soil pH above which rate of decomposition is maximum.

JULES_SOIL_ECOSSE::decomp_temp_coeff_rothc¶

Type:	REAL(3)
Default:	47.9, 106.0, 18.3

Constants in the RothC from of the decomposition temperature modifier (temp_modifier = 2).

Note that these default values are also those harwired in the code for use with the RothC model (soil_bgc_model = 2, l_q10 = F ).

JULES_SOIL_ECOSSE::decomp_wrate_min_rothc¶

Type:	REAL
Default:	0.2

Minimum allowed value of the water rate modifier for decomposition when the RothC form is used (water_modifier = 2).

JULES_SOIL_ECOSSE::decomp_wrate_min_jules¶

Type:	REAL
Default:	0.2

Minimum allowed value of the water rate modifier for decomposition when the JULES form is used (water_modifier = 1).

Note that this default value is also that harwired in the code for use with the RothC model (soil_bgc_model = 2).

Parameters for ECOSSE that are only used if soil N is included (l_soil_n = TRUE).

JULES_SOIL_ECOSSE::l_decomp_slow¶

Type:	logical
Default:	T

Switch controlling how lack of nitrogen affects soil decomposition.

TRUE: Reduce the decomposition rate.
FALSE: Reduce the efficiency of decomposition, so that decomposition results in increased production of CO₂ and decreased production of further soil C. This is the approach used in the standalone version of ECOSSE.

JULES_SOIL_ECOSSE::depo_nit_frac¶

Type:	REAL
Permitted:	0 <= depo_nit_frac <= 1
Default:	1.0

The fraction of nitrogen deposition that is aded to the soil nitrate pool. The complement is aded to the ammonium pool.

JULES_SOIL_ECOSSE::bacteria_min_frac¶

Type:	REAL
Permitted:	0 <= bacteria_min_frac <= 1
Default:	0.2

The minimum fraction of the decomposer community that are bacteria.

JULES_SOIL_ECOSSE::bacteria_max_frac¶

Type:	REAL
Permitted:	bacteria_min_frac <= bacteria_max_frac <= 1
Default:	0.5

The maximum fraction of the decomposer community that are bacteria.

JULES_SOIL_ECOSSE::bacteria_min_frac_pH¶

Type:	REAL
Default:	4.0

The soil pH at or below which the fraction of bacteria is at a minimum.

JULES_SOIL_ECOSSE::bacteria_max_frac_pH¶

Type:	REAL
Permitted:	bacteria_min_frac_pH <= bacteria_max_frac_pH
Default:	5.5

The soil pH at or above which the fraction of bacteria is at a maximum.

JULES_SOIL_ECOSSE::cn_bacteria¶

Type:	REAL
Default:	5.5

The C:N ratio of soil bacteria.

JULES_SOIL_ECOSSE::cn_fungi¶

Type:	REAL
Default:	5.5

The C:N ratio of soil fungi.

JULES_SOIL_ECOSSE::depth_nitrif¶

Type:	REAL
Default:	0.25

Greatest depth at which nitrification and denitrification are allowed (m).

JULES_SOIL_ECOSSE::nitrif_rate¶

Type:	REAL
Default:	9.921e-7

Rate constant for nitrification (s^-1).

JULES_SOIL_ECOSSE::nitrif_wrate_min¶

Type:	REAL
Default:	0.6

Minimum allowed value of the water rate modifier for nitrification when RothC form is used. Only used if water_modifier = 2.).

JULES_SOIL_ECOSSE::nitrif_max_factor¶

Type:	REAL
Default:	0.1

Shape factor in rate modifier for nitrification (kg m^-3).

JULES_SOIL_ECOSSE::nitrif_frac_n2o_fc¶

Type:	REAL
Permitted:	0 <= nitrif_frac_n2o_fc <= 1
Default:	0.02

Fraction of nitrification lost as N₂O by partial nitrification at field capacity.

JULES_SOIL_ECOSSE::nitrif_frac_gas¶

Type:	REAL
Permitted:	0 <= nitrif_frac_gas <= 1
Default:	0.02

Fraction of nitrification lost as gas through full nitrification.

JULES_SOIL_ECOSSE::nitrif_frac_no¶

Type:	REAL
Permitted:	0 <= nitrif_frac_no <= 1
Default:	0.4

Fraction of nitrification gas loss through full nitrification that is NO.

JULES_SOIL_ECOSSE::denit50¶

Type:	REAL
Default:	0.033

Amount of nitrate at which denitrification rate is 50% of the potential rate (kg m^-3).

JULES_SOIL_ECOSSE::denit_bio_factor¶

Type:	REAL
Default:	0.005

Factor in denitrification calculation to convert flux of CO₂ into a representation of biological activity (m² kg^-1).

JULES_SOIL_ECOSSE::denit_frac_n2_fc¶

Type:	REAL
Permitted:	0 <= denit_frac_n2_fc <= 1
Default:	0.55

Proportion of denitrified N that becomes N₂ when soil moisture is at field capacity.

JULES_SOIL_ECOSSE::denit_nitrate_equal¶

Type:	REAL
Default:	0.4

Amount of N in soil nitrate at which denitrified N is released as equal amounts of N₂ and N_{2`O (kg m:sup:}-3`).

JULES_SOIL_ECOSSE::denit_water_coeff¶

Type:	REAL(3)
Default:	0.62, 0.38, 1.74

Constants describing water modifier for denitrification.

JULES_SOIL_ECOSSE::amm_leach_min¶

Type:	REAL
Default:	0.02

Minimum allowed amount of N in soil ammonium after leaching (kg m^-3).

JULES_SOIL_ECOSSE::n_inorg_max_conc¶

Type:	REAL
Default:	-1.0

Maximum-allowed concentration of inorganic N in a layer (kg m^-3). A value less than zero means no maximum concentration is imposed.

6.12. `jules_soil_ecosse.nml`¶

6.12.1. `JULES_SOIL_ECOSSE` namelist members¶

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6.12. jules_soil_ecosse.nml¶

6.12.1. JULES_SOIL_ECOSSE namelist members¶

6.12. `jules_soil_ecosse.nml`¶

6.12.1. `JULES_SOIL_ECOSSE` namelist members¶