oxygen zone of the Black Sea. Similar results were obtained for the zone of the
Main Black Sea stream, flowing around the periphery of the Black Sea deep-water
basin (Polikarpov et al. 2008). On results of these studies found that the period of
the vertical circulation of the Black Sea waters in the layer of 0–50 m can be
estimated at 5 years, a period of complete renewal of water in the bottom of the
pycnocline in 15–25 years, and the entire volume of the sea in 140 years (Egorov
et al. 1999).
With an area of 423 thousand. km
2 and a maximum depth of 2212 m the volume
of water of the Black Sea is 547015 km
3 , of which 475890 km
3 (87%) of its relate to
hydrogen-sulphidous zone. However, about 90% of the water hydrogen-sulphidous
zone of the Black Sea, on average corresponds to a depth of over 200 m, and the
area of their upper boundary is about 312 thousand. km
2 (Goncharov et al. 1965;
Fig. 17.7 Profiles of the vertical distribution of
90
Sr in the water of the center of western
circulation of the Black Sea in 2000, 2013 and 2015 (published for the first time)
Fig. 17.8 The ratio of the
concentrations vertical
distribution of
90
Sr in water
of the center of the western
circulation of the Black Sea
in 2000 and 2013 (published
for the first time)
286
N.Y. Mirzoyeva et al.