SIMPLE MODEL FOR THE REACIDIFICATION OF LIMED LAKES, TAKING THE SIMULTANEOUS DEACTIVATION AND DISSOLUTION OF CALCITE IN THE SEDIMENTS INTO ACCOUNT.

The model presented in this study is a simple model in which the inhibition concept takes care of more than one mechanism affecting the long term dissolution of calcite. It lumps together the combined effects of dispersion, sedimentation, sorption to the sediments and true inhibition. The reversible sorption of calcium to the sediments play an important role in determining the mass balance for calcium, and the amount of it available to the water column. Organic sediments may consume considerable amounts of calcium or magnesium from the water column. Models for the sorption of calcium to the sediments are being incorporated into the reacidification model.