Author(s): Semyon Polukhin
Linked Author(s):
Keywords: Boreal lake; Dissolved oxygen; High-frequency data; Trophic state; Diurnal cycle
Abstract: In the present work we studied diurnal fluctuations of dissolved oxygen in two russian water bodies with different trophic status - Mozhaiskoye Reservoir and Glubokoye Lake, which are significantly differed in hydrological conditions and human impact degree. It was obtained that the values of the fluctuations range in Mozhaiskoye reservoir during the whole vegetation period were higher than those found in Lake Glubokoe. The difference between maximum and minimum concentrations during a day can change due to the development/suspession of phytoplankton communities, destruction/strengthening of temperature stratification, and formation of runup events in water bodies. Maximum average daily dissolved oxygen content in Mozhaiskoye reservoir reached 190% of saturation, and the amplitude of diurnal fluctuations was 3.6 mg/l. Diurnal fluctuations of dissolved oxygen concentration in Lake Glubokoye showed lower variability and averaged 0.6 mg/l. The maximum oxygen content in the surface layer in the lake reached 128% of saturation.
Year: 2024