Carbon dioxide, oxygen and biogenic elements in the water under ice of the South Baikal littoral
V.M. Domysheva1, D.A. Pestunov2,3, M.V. Sakirko1, A.M. Shamrin2, M.V. Panchenko2
1Limnological Institute of the Siberian Branch of the RAS, 3, Ulan-Batorskaya str., 664033, Irkutsk, Russia
2V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
3National Research Tomsk Polytechnic University, 30, Lenin Avenue, Tomsk, 634050, Russia
Keywords: Байкал, углекислый газ, кислород, нитраты, фосфаты, кремний, подледный период, суточный ход, фотосинтез, оптические характеристики льда, Baikal, carbon dioxide, oxygen, nitrates, phosphates, silicon, ice period, diurnal variation, photosynthesis, optical characteristics of the ice
Abstract
The results of the annual series of complex measurements of carbon dioxide, oxygen and nutrients in the water under ice of the littoral of the southern area of Lake Baikal, which were carried out since 2004 till 2016, are analyzed in the paper. An important conclusion is the fact that the photosynthetic activity of the plankton at the end of the period of ice cover leads to a significant decrease in the partial pressure of carbon dioxide in the water(to 240-350 matm), which is noticeably less than the partial pressure of CO2 in the atmosphere (about 385 matm), and consequently, the carbon dioxide flux during the period of removing ice from the littoral area of southern Baikal can be directed only from the atmosphere to the water surface.
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