Author(s): Osama A. Maher
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Abstract: A field study was carried out during late April 2000 in Lake Vendyurskoe: a shallow lake situated in the Russian Republic of Karelia. The aim of the investigation was to monitor the effect of thermal convection that takes place during this time of the year on both dissolved oxygen content and distribution in the water body. During seven days of measurements, more than fifty vertical profiles of dissolved Oxygen and temperature were made in Lake Vendyurskoe. During this period it was noticed that the stable thermal stratification, which characterises the lake during the ice cover period, was broke and a mixing layer was formed in the upper part of the water column, directly under the ice cover. The water temperature in the upper part of the water column increased more than 1°C in a period of six days. This increase in water temperature led to a decrease in the oxygen content of about 2 mg/l at some parts of the lakes.
Year: 2002