(2017-01-19) Järv, Olle; Tenkanen, Henrikki; Toivonen, Tuuli; Department of Geosciences and Geography, University of Helsinki - Järv, Olle; Department of Geosciences and Geography, University of Helsinki - Tenkanen, Henrikki; Department of Geosciences and Geography, University of Helsinki - Toivonen, Tuuli