Sediment And Pore Water Properties Across The Chemocline Of A Mine Water-Impacted Boreal Lake During Winter Stagnation And Autumn Overturn

摘要

Discharge of mine waters into the typically dimictic lakes in the Nordics may cause meromixis in which complete overturns no longer happen. Water column properties were measured from the mining-meromictic Lake Valkjarvi and sediments and pore waters were sampled below, at, and above the chemocline during winter stratification and autumn overturn. Element concentrations were elevated in pore and overlying waters during the overturn. Sediment bulk concentrations showed an opposite behavior. The results demonstrate the importance of the chemocline fluctuation zone on the annual cycle of elements and trace metal concentrations of the sediment compartment.