By results of the ship measurements lead in pelagial of Lake Baikal in May-June and September 2008, spatial seasonal variability of a direction of carbonic gas streams in the system "water-atmosphere" is analyzed. Basic stream СО2 in May-June is directed to the atmosphere, and in September its runoff to the water surface is observed. Connection of biomass of phito- and picoplankton with the contents of carbonic gas and biogenic elements in water of the lake is revealed. It is shown, that the role of specific change of biota is a major factor determining seasonal variability of the direction of the carbonic gas stream.
gas exchange; carbon dioxide; phyto- and pico-plankton; pelagial; biogenic elements