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Summary
In order to calculate the vertical extinction coefficient for photosynthetically active radiation in Lake Maarsseveen, a computer model was developed. The model was supplied with data on the concentrations of phytoplankton, non-living suspended particles (tripton) and dissolved organic matter (yellow substance). A scattering function was taken from literature. The simulated values of the extinction coefficient as a function of solar height and depth were confirmed by in situ measurements.
A comparison was made with a much simpler model in which scattering is ignored. It appeared that light scattering may, in some cases only, increase the mean pathlength, and therefore the extinction coefficient.