Estimation of the upwelling rate of deep waters in the Black Sea from the H2S vertical distribution

The expression for the bottom convection intensity is derived from the equality of the advective vertical flux of H₂S within 1000–2000 m to the diffusion turbulent flow close to the H₂S zone upper boundary. The upwelling rate, which is expressed via the H₂S concentration in deep waters and the gradient of the H₂S concentration near the upper boundary, is 10^–4 cm/s. It is shown that the H₂S diffusion flux in deep waters is an order less than the advective one. The conclusion that below 1000 m the age of H₂S does not exceed 30 years and H₂S reaches the upper boundary in approximately 150 years is derived.Translated by Mikhail M. Trufanov.