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.
Type: | logical |
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Default: | T |
Switch to include soil nitrogen in ECOSSE.
Type: | logical |
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Default: | T |
Switch to match ECOSSE soil C and N layers to those for soil moisture.
Type: | integer |
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Permitted: | >= 1 |
Default: | None |
The number of ECOSSE soil carbon layers. Not used if l_match_layers = TRUE.
Type: | real(dim_cslayer) |
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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).
Type: | REAL |
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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.
Type: | logical |
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Default: | T |
Switch controlling the averaging of the physical driving variables that are input to ECOSSE (e.g. soil temperature).
Type: | INTEGER |
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Permitted: | 1 or 2 |
Default: | 1 |
Switch for the vertical distribution of litterfall inputs of C and N to the soil.
Possible values are:
Type: | REAL |
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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.
Type: | REAL |
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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.
Type: | INTEGER |
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Permitted: | 1 or 2 |
Default: | 2 |
Switch for the form of the temperature rate modifier for decomposition.
type: INTEGER permitted: 1 or 2 default: 2 Switch for the form of the water rate modifier for decomposition and nitrification.
Type: | REAL(4) |
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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).
Type: | REAL |
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Default: | 0.2 |
Minimum allowed value of pH rate modifier for decomposition.
Type: | REAL |
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Permitted: | decomp_ph_min <= decomp_ph_max |
Default: | 1.0 |
Soil pH below which rate of decomposition is minimum.
Type: | REAL |
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Permitted: | decomp_ph_max >= decomp_ph_min |
Default: | 4.5 |
Soil pH above which rate of decomposition is maximum.
Type: | REAL(3) |
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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 ).
Type: | REAL |
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Default: | 0.2 |
Minimum allowed value of the water rate modifier for decomposition when the RothC form is used (water_modifier = 2).
Type: | REAL |
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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).
Type: | logical |
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Default: | T |
Switch controlling how lack of nitrogen affects soil decomposition.
Type: | REAL |
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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.
Type: | REAL |
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Permitted: | 0 <= bacteria_min_frac <= 1 |
Default: | 0.2 |
The minimum fraction of the decomposer community that are bacteria.
Type: | REAL |
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Permitted: | bacteria_min_frac <= bacteria_max_frac <= 1 |
Default: | 0.5 |
The maximum fraction of the decomposer community that are bacteria.
Type: | REAL |
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Default: | 4.0 |
The soil pH at or below which the fraction of bacteria is at a minimum.
Type: | REAL |
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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.
Type: | REAL |
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Default: | 5.5 |
The C:N ratio of soil bacteria.
Type: | REAL |
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Default: | 5.5 |
The C:N ratio of soil fungi.
Type: | REAL |
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Default: | 0.25 |
Greatest depth at which nitrification and denitrification are allowed (m).
Type: | REAL |
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Default: | 9.921e-7 |
Rate constant for nitrification (s^{-1}).
Type: | REAL |
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Default: | 0.6 |
Minimum allowed value of the water rate modifier for nitrification when RothC form is used. Only used if water_modifier = 2.).
Type: | REAL |
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Default: | 0.1 |
Shape factor in rate modifier for nitrification (kg m^{-3}).
Type: | REAL |
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Permitted: | 0 <= nitrif_frac_n2o_fc <= 1 |
Default: | 0.02 |
Fraction of nitrification lost as N_{2}O by partial nitrification at field capacity.
Type: | REAL |
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Permitted: | 0 <= nitrif_frac_gas <= 1 |
Default: | 0.02 |
Fraction of nitrification lost as gas through full nitrification.
Type: | REAL |
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Permitted: | 0 <= nitrif_frac_no <= 1 |
Default: | 0.4 |
Fraction of nitrification gas loss through full nitrification that is NO.
Type: | REAL |
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Default: | 0.033 |
Amount of nitrate at which denitrification rate is 50% of the potential rate (kg m^{-3}).
Type: | REAL |
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Default: | 50.0 |
Factor in denitrification calculation to convert flux of CO_{2} into a representation of biological activity (m^{2} kg^{-1}).
Type: | REAL |
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Permitted: | 0 <= denit_frac_n2_fc <= 1 |
Default: | 0.55 |
Proportion of denitrified N that becomes N_{2} when soil moisture is at field capacity.
Type: | REAL |
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Default: | 10.0 |
Ratio of N in soil nitrate to amount denitrified at or below which N_{2} emission is zero and all denitrified N is lost as N_{2}O.
Type: | REAL |
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Default: | 0.4 |
Amount of N in soil nitrate at which denitrified N is released as equal amounts of N_{2} and N_{2`O (kg m:sup:}-3`).
Type: | REAL(3) |
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Default: | 0.62, 0.38, 1.74 |
Constants describing water modifier for denitrification.
Type: | REAL |
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Default: | 0.02 |
Minimum allowed amount of N in soil ammonium after leaching (kg m^{-3}).
Type: | REAL |
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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.