bio Fennel.in

Fasham Model Input Script - bioFasham.in

The bioFasham.in file sets the parameters for the bioFasham model. The name of this file is set by the BPARNAM keyword in the ocean.in file. A default bioFasham.in standard input ASCII file can be found in the User/External subdirectory of the ROMS source code. In order to include the bioFasham model in ROMS you must set BPARNAM correctly and activate the BIO_FASHAM CPP option.

Notice: Detailed information about ROMS input script file syntax can be found here.

Biological Model Parameters

Input parameter units are specified within brackets ([ ])and default values are specified within braces ({ }).

• This switch to control the computation of bioFasham within nested and/or multiple connected grids. By default this switch is set to TRUE in mod_scalars.F for all grids. Ngrids values are expected. The user has the option, for example, to compute the biology in just one of the nested grids. If so, this switch needs to be consistent with the dimension parameter NBT in mod_param.F. In order to make the model more efficient in memory usage, NBT(:) should be zero in such grids.

Lbiology == T

• Maximum number of iterations to achieve convergence of the nonlinear solution.

BioIter == 1

• Light attenuation due to seawater [1/m], {0.04d0}.

AttSW == 0.04d0

• Light attenuation by chlorophyll [1/(mg_Chl m2)], {0.02486d0}.

AttChl == 0.02486d0

• Fraction of shortwave radiation that is photosynthetically active [nondimensional], {0.43d0}.

PARfrac == 0.43d0

• Eppley temperature-limited growth parameter [nondimensional], {1.0d0}.

Vp0 == 1.0d0

• Radiation threshold for nitrification inhibition [Watts/m2], {0.0095d0}.

I_thNH4 == 0.0095d0

• Half-saturation radiation for nitrification inhibition [Watts/m2], {0.036d0}.

D_p5NH4 == 0.1d0

• Nitrification rate: oxidation of NH₄ to NO₃ [1/day], {0.05d0}.

NitriR == 0.05d0

• Inverse half-saturation for phytoplankton NO₃ uptake [1/(millimole_N m-3)], {2.0d0}.

K_NO3 == 2.0d0

• Inverse half-saturation for phytoplankton NH₄ uptake [1/(millimole_N m-3)], {2.0d0}.

K_NH4 == 2.0d0

• Zooplankton half-saturation constant (squared) for ingestion [millimole_N m-3]^2, {1.0d0}.

K_Phy == 2.0d0

• Maximum chlorophyll to carbon ratio [mg_Chl/mg_C], {0.0535d0}.

Chl2C_m == 0.0535d0

• Chlorophyll minimum threshold value [mg_Chl/m3], {0.0d0}.

ChlMin == 0.001d0

• Phytoplankton Carbon:Nitrogen ratio [mole_C/mole_N] , {6.625d0}.

PhyCN == 6.625d0

• Phytoplankton, NH₄ inhibition parameter [1/(millimole_N)], {1.5d0}.

PhyIP == 1.5d0

• Phytoplankton, initial slope of P-I curve [mg_C/(mg_Chl Watts m-2 day)], {0.025d0}.

PhyIS == 0.025d0

• Phytoplankton minimum threshold value [millimole_N/m3], {0.0d0}.

PhyMin == 0.001d0

• Phytoplankton mortality rate [1/day], {0.072d0}.

PhyMR == 0.15d0

• Zooplankton Nitrogen assimilation efficiency [nondimesnional], {0.75d0}.

ZooAE_N == 0.75d0

• Zooplankton Basal metabolism [1/day], {0.1d0}.

ZooBM == 0.1d0

• Zooplankton Carbon:Nitrogen ratio [mole_C/mole_N], {5.0d0}.

ZooCN == 6.625d0

• Zooplankton specific excretion rate [1/day], {0.1d0}.

ZooER == 0.1d0

• Zooplankton maximum growth rate [1/day], {0.75d0}.

ZooGR == 0.6d0

• Zooplankton minimum threshold value [millimole_N/m3], {0.0d0}.

ZooMin == 0.001d0

• Zooplankton mortality rate [1/day], {0.025d0}.

ZooMR == 0.025d0

• Large detritus remineralization rate N-fraction [1/day], {0.01d0}.

LDeRRN == 0.01d0

• Large detritus remineralization rate C-fraction [1/day].

LDeRRC == 0.01d0

• Coagulation rate: aggregation rate of SDeN + Phy ==> LDeN [1/day], {0.005d0}.

CoagR == 0.005d0

• Small detritus remineralization rate N-fraction [1/day], {0.03d0}.

SDeRRN == 0.03d0

• Small detritus remineralization rate C-fraction[1/day].

SDeRRC == 0.03d0

• Vertical sinking velocity for phytoplankton [m/day], {0.1d0}.

wPhy == 0.1d0

• Vertical sinking velocity for large detritus [m/day], {1.0d0}.

wLDet == 1.0d0

• Vertical sinking velocity for small detritus [m/day], {0.1d0}.

wSDet == 0.1d0

• CO₂ partial pressure in the air (parts per million by volume), {377.0d0}.

pCO2air == 370.0d0

• Lateral, constant, harmonic/biharmonic horizontal diffusion of biological tracer: [1:NBT,Ngrids] values expected.

TNU2 == 12*0.0d0  ! m2/s
TNU4 == 12*0.0d0  ! m4/s

• Vertical mixing coefficients for biological tracers: [1:NBT,Ngrids] values expected.

AKT_BAK == 12*1.0d-6  ! m2/s

• Nudging/relaxation time scales, inverse scales will be computed internally: [1:NBT,Ngrids] values expected.

TNUDG == 12*0.0d0  ! days

• Logical switches to activate writing of biological tracers into history output file: [1:NBT,Ngrids] values expected.

Hout(idTvar) == 12*T  ! biological tracer
Hout(idTsur) == 12*F  ! surface tracer flux

• Logical switches to activate writing of diagnostics terms into diagnostic output file [1:Ngrids] values expected.

Hout(iCOfx) == T  ! air-sea CO₂ flux
Hout(iDNIT) == T  ! denitrification flux
Hout(ipCO2) == T  ! CO₂ partial pressure
Hout(iO2fx) == T  ! air-sea O₂ flux
Hout(iPPro) == T  ! primary production
Hout(iNO3u) == T  ! NO₃ uptake