for the hydrological year 1980 – 1981 (Figure 4, top), the method
works well. The date retrieved corresponds exactly to the moment the snowpack starts
decreasing
continuously, and a steep increase in the melting line can be noted, indicating the
onset of the melt season. However, this filter does not work in all cases, as shown for
Hágöngulón for the years 1986 – 1987 (Figure 4, bottom). In that case
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