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Estimating uncertainties of projected Baltic Sea salinity in the late 21st century

As the uncertainty of projected precipitation and wind changes in regional climate change scenario simulations over Europe for the late 21st century is large, we applied a multi‐model ensemble approach using 16 scenario simulations based upon seven regional models, five global models, and two emission scenarios to gain confidence in projected salinity changes in the Baltic Sea. In the dynamical downscaling approach a regional ocean circulation model and a large‐scale hydrological model for the entire Baltic Sea catchment area were used. Despite the uncertainties, mainly caused by global model biases, salinity changes in all projections are either negative or not statistically significant in terms of natural variability.