Dissolved reactive manganese at pelagic redoxclines (part II): Hydrodynamic conditions for accumulation

► dissolved reactive manganese has been determined at the redoxclines of the Black and Baltic Seas ► dMnreact is also found at the redoxcline of a seasonally anoxic freshwater lake ► differences in dMnreact concentrations or even absence are explained by hydrodynamic properties ► the essential prerequisite for accumulation of dMnreact forms a stable redoxcline ► lateral intrusions supply O2 or H2S and cause immediate oxidation/reduction of dMnreact