in Lake Pielinen
and Lake Saimaa (Table 2), but the seasonal changes were significant (Fig. 4).
The water levels increased during winter and decreased during summer months.
Student t-tests for the average seasonal (winter [DJF], spring [
MAM], summer [JJA],
autumn [SON]) water levels showed that in 2040–2069 and 2070–2099 the changes
in water levels from the reference period were on average
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