Spatio-temporal changes in variability of temperature, precipitation and runoff in Finland during the period 1962-2014

The analysis is based on 1) interpolated areal average temperature and total precipitation based on corrected observations, and 2) modelled runoff based on the areal averages, both prepared by the Finnish Environmental Institute (SYKE). Temporal changes in variability were analyzed by constructing moving window median absolute deviation time series at annual and seasonal scales.

Sub-basins with similar patterns of temporal variability were identified using principal component analysis and agglomerative hierarchical clustering. Presence of monotonic trends in variability was tested. Distinct areas with similar patterns of statistically significant changes in variability were found.