DETERMINATION OF THE TIME-SCALE OF THE BAIKAL DEEP-WATER RENEWAL WITHTHE USE OF CHEMICAL TRACERS

The fact that water has a maximum density depending on pressure plays a significant role in the processes of deep-water renewal in deep, tem perate, fresh-water lakes, such as, for example, Lake Baikal. The pres ent paper discusses the questions of deep ventilation. On the basis of interpreting data on the content of chemical tracers in the Baikal wa ter, the rates of the water renewal in the lake basins have been deter mined. As tracers, the freons F-11 and F-12 - man-induced materials st able both in water and in the air - were used, whose concentration pro files were measured in the course of expedition studies in 1992-93.