MOdel Shopping Tool ( MOST )
"DOC budget module" from PISCES v1 Equations
Same equation in other models :
Equation Description :
DOC budget is controlled by the exudation rates of the two phytoplankton groups represented (diatoms and nanophytoplankton), plus excretion by zooplankton (Z and M), plus contributions from grazing and flux feeding, and POC degradation, less the adsorption of DOC.
Parameter definitions and values:
delta P, D = 0.05 (diatom and nanophytoplankton DOC exudation; dimensionless) ;
gamma M = (preference for mesozooplankton by closure trophic level);
gamma Z = 1.0 (mesozooplankton preference for microzoo);
epsilon = 0.5;
lambda DOC = 0.3 d-1 (DOC remineralization rate);
lambda POC = 0.025 d-1 (POC degradation rate);
mu P,D = phytoplankton gross primary production (link below);
PHI = aggregation processes due to turbulence coagulation
Phi DOC-POCs = 80, 698 (mol C l-1)-1;
Phi DOC-POCb = 10500 (mol C l-1)-1;
sigma = 0.3 (fecal pellets production);
D = concentration of diatoms in micro mol C l-1;
e = 0.35 (micro, mesozooplankton growth efficiency);
g M = 0.7 d-1 (mesozoo max grazing rate);
g Z = 4 d-1 (microzoo max grazing rate);
K Z = 0.1 micro mol C l-1 (half-saturation k for excretion);
K Z = 0.1 micro mol C l-1 (half-saturation k for excretion);
M = mesozooplankton concentration in micro mol C l-1;
P = concentration of phytoplankton in micro mol C l-1;
POCs = small POC concentration;
POCb = large POC concentration;
r = 0.03,0.008 d-1 (micro, mesozooplankton excretion rate);
Z = microzooplankton concentration in micro mol C l-1;
