Mixing model for the north-west Black Sea using 90Sr and salinity as tracers

A model to quantify the mixing ratios of Danube and Dnieper river water in the northwestern region of the Black Sea is presented. In this model, mixing ratios are determined from the measured salinity and 90Sr activities of surface water samples. The details of this model and error and sensitivity analyses are presented. Using this approach, mean mixing ratios and hence river transport values can be reliably derived which are of interest to more general questions of pollution transport in this region. Inter-annual variability in the 90Sr input from the Dnieper river and the overall decrease in 90Sr inputs limit the ultimate applicability of this approach.