Abstracts

Water Ecosystems

The phenomena of the total bloom of diatom algal and development of the penetrating turbulent convection in the under–ice water layer during the early biological spring (March, April) have been studied sufficiently well by researchers of lake Baikal [2, 3]. The developed in the IWEP, SBRAS, water ecosystem model of plankton bioefficiency (bioproductivity) of the deep lake in this period of a year represents a complex of combined problem-oriented models including the following: models of dynamics and optics of snow and ice cover; models of mixing processes in the under–ice water layer; physical/biological coupling models of the dynamics of nutrients, phyto–and zooplanktons. As a hydrodynamic basis of this complex, we use the eddy–resolving model (Large Eddy Simulation) of convective boundary layer in the ice–covered lake, which is in duced by the volume solar radiation heating of water with the temperature lower than the temperature of the maximum density [1].

On the basis of comparison of the numerical experiment results and field data the following are discussed in detail: features of the spatial–time evolution and energy processes of the large–eddy turbulence in the ice–covered lake; mechanisms of suspension effects of the diatom algal in the photosynthesis layer; changes of optical parameters of water by under–ice algal blooms; problems of the modeling of input and transport of nutrients.

This work is supported by the Russion Foundation of Basic Research under grant 99 – 05 – 64735; it is additionally supported by collaboration with Dr. N.G.Granin and Prof. M.N.Shimaraev (Limnological Inst. of SBRAS).

Note. Abstracts are published in author's edition

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