THE MATHEMATICAL-MODELING OF THE NITROGEN AND REDUCED SULFUR COMPOUNDTRANSFORMATION IN OXIC, ANOXIC AND INTERMEDIATE CONDITIONS BY THE EXAMPLE OF THE BLACK-SEA REDOX ZONE

To desribe the nitrogen and reduced sulfur cycles in the oxic - anoxic conditions a mathematical model was proposed. The dependences of the transformations rates upon the oxygen concentration were parameterised by the semiempirical functions. The modeling calculations were provid ed on the base of the diffusion equation for the unconservative substa nce without account of the advective and horizontal diffusion terms. T he boundary conditions of the 1 and 2 (Orlansky similarity) types were used. The results of calculations were found to be adequate to the ob served sitution.