Author(s): Olli Laasanen
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Abstract: Relationships between freeze-up dates, durations of ice cover and break-up dates of 19 Finnish lakes and air temperatures in high latitudes over a period of one hundred years are studied. Global mean autumn, winter and spring air temperatures between 65°N and 85°N latitudes were used. An increase of 1°C in autumn air temperature was found to shift freeze-up date 6.4 d later The same increase in spring temperature shifted the break-up date 2.7 d earlier. If both autumn and spring temperatures will raise 1°C the duration of ice cover will be 7.5 d shorter. The correlations were in most cases significant. Factors weakening the relationships are discussed.
Year: 1984