Mikhail N. Shimaraev

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Deep-water renewal in Lake Baikal (Siberia), the world’s deepest lake and largest lake by volume, is relatively fast. Water age calculated from tritium and helium as well as from chlorofluorocarbons does not exceed 19 yr. Relative saturation of dissolved oxygen typically exceeds 80%. The equation of state of Baikal water was determined including the(More)
The 3H-3He age of a water mass is a measure of the time that has passed since the water mass was last in contact with the afinosphere. Between 1992 and 1995 a detailed study of3H-3He ages was conducted in Lake BaikaI, the deepest and largest lake by volume on Earth, to investigate deep water renewal in its three major basins. Maximum 3H-3He ages are 14-17(More)
The vertical distribution of microorganisms during spring deep-water renewal in Lake Baikal was studied. The downward advection of trophogenic waters was found to create conditions for the extensive growth of microorganisms capable of decomposing and mineralizing organic carbon, nitrogen, and phosphorus in deep water layers. These processes occur annually(More)
It is suggested that existence of "dwarfs" and "giants" among Baikal gastropods depends on several factors. "Dwarfs" occurs in habitats 1) where sedimentation rate is low and thick silt layer is absent (the small shell without long periostracal nodules does not allow the animal to stay on the soft sediment surface; 2) where there is hard substratum suitable(More)
We investigated upwelling events in the pelagic area of Lake Baikal that developed during summer stratification (July–November) using a combination of in situ and satellite observations. These upwellings appear in the centres of local cyclonic macrovortices with compensatory downwelling located on their periphery in coastal areas. The average duration of(More)
Based on the detailed temporal scale of climatic events in the Northern Hemisphere from late glaciations to Holocene, and data on variability of CO2 concentrations in the atmosphere, some abiotic indices of the ecosystem of Lake Baikal during the past 16 thousand years is reconstructed. In the Late Pleistocene, extremely low input of nutrients from the(More)
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