MOdel Shopping Tool ( MOST )
"microzooplankton budget module" from PISCES v1 Equations
Same equation in other models :
Equation Description :
Microzooplankton budget in PISCES is a function of ingestion of the two phytoplankton groups and small detritus, and losses via excretion. N represents the grazing on each species nanophytoplankton (P), diatoms (D) and POC, and is defined following Fasham et al. (1993).
Microzooplankton experiences mortality only through mesozooplankton predation.
Parameters definitions and typical values in PISCES:
D = diatom concentration micro mol C l-1;
e Z = 0.35 (microzooplankton growth efficiency);
g Z = 4 d-1 (max grazing rate);
I = phytoplankton groups microzooplankton can graze on, P and D;
K G Z = 20 micro mol C l-1 (half-saturation k for grazing);
K Z = 0.1 micro mol C l-1 (half-saturation k for excretion);
P = nanophytoplankton concentration micro mol C l-1;
p D Z (or gamma D) = 0.5 (microzooplankton preference for diatoms);
p N Z = microzooplankton preference for species N (eg P, D, POCs);
p P Z (or gamma P) = 0.5 (microzooplankton preference for nanophytoplankton);
p POC Z (or gamma POC) = 0.0 (microzooplankton preference for POC);
POCs = small POC concentration;
r Z = 0.03 d-1 (excretion rate);
References:
Fasham, M. J. R., et al 1993. Global Biogeochem. Cycles, 7, 379-416;
