Modelling the manganese cycling in two stratified fjords

This paper presents a parameterized model for the particulate and dissolved manganese profiles in two stratified fjords. Rates of oxidation and reduction of manganese are of the order of 1.0 × 10 −15 mol cm −3 s −1. Oxidation of manganese is probably not promoted by an inorganic surface-catalyzed reaction. Cycling of manganese in the redoxcline is extensive (10–100 cycles) and is related to the input of manganese to the fjords. Calibration of the model against sediment-trap-data allow instantaneous eddy diffusion coefficients to be estimated. These are of the order of 0.01 and 1.0 × 10 −4 cm 2 s −1.