Author(s): Anund Sigurd Kvambekk; Kjetil Melvold
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Abstract: Long term data series of ice cover on lakes and river temperatures from the mounta in areas of Norway are lacking. The present study analyses the last four decades of ice data from the subalpine lake Ovre Heimdalsvatn, and water temperature data from its outletriver, Hinogla. The study also examines the air temperature/river temperature relationships, and the air temperature/ice freeze-up and break-up dates. During the months of July, August and September the water temperature in Hinogla were well correlated to the air temperature, but the correlation was poor in the remaining months due to the ice cover and snow conditions. A significant temperature increase of 2-3 °C was observed in Hinogla in the months August-October since 1984. There were only minor changes in the durat ion of the ice cover season dur ing the last 40 years, but a delay o f 9 days was found in the freeze-up date and a delay of 6 days in the break-up date, although the latter was not significant.
Year: 2010