Moisture sources for extreme Swedish rainfall

Malin Gustafsson, David Rayner, and Deliang Chen, Extreme rainfall events in southern Sweden: where does the moisture come from? Tellus, doi:10.1111/j.1600-0870.2010.00456.x

Sweden has experienced a series of floods since 1993, but the critical factors that lead to extreme rainfall in Sweden are not known. Using a Lagrangian trajectory model, the authors found that moisture associated with extreme summer precipitation events in southern Sweden arrived from continental Europe and the Baltic Sea, whereas trajectories for more typical rainfall events came mainly from the North Sea. The results suggest that regional recycling of precipitation is an important source of moisture for the most intense rainfall.