Simple model to illustrate Steele's equation for primary production of phytoplankton.
The equation is:
Ppot = Pmax I/Iopt exp(1-I/Iopt)
Ppot: Potential production (e.g. d-1, or mg C m-2 d-1) Pmax: Maximum production (same units as Ppot) I: Light energy at depth of interest (e.g. uE m-2 s-1) Iopt: Light energy at which Pmax occurs (same units as I)
The model contains no state variables, just illustrates the rate of production, by making the value of I equal to the timestep (in days). Move the slider to the left for more pronounced photoinhibition, to the right for photosaturation.