Approximation of hydrogen sulfide vertical distribution in the Black Sea
Abstract
Basing on 2010–2016 measurements in the Black Sea possible approximations of the vertical distribution of hydrogen sulfide concentrations by an analytic function are analyzed for further use in the calculation of the components of marine carbonate system, in particular for the estimation of the hydrosulfide component of total alkalinity. Approximation of the hydrogen sulfide profile was carried out with the account of its dependence on various density anomaly representations – sigma-t density (σt), sigma-theta or potential density (σθ) and sigma density (σs,t,p). An exponential function is used to approximate the hydrogen sulfide profile as a function of density σt and density σθ. A logistic function is used when the hydrogen sulfide profile was represented as a function of density σs,t,p. In the deep-sea layer, an ambiguous correspondence between the concentration of hydrogen sulfide and the value of sigma-t density was revealed because of the inversion in st vertical profile in the near-bottom quasi-homogeneous layer. This ambiguity results in higher approximation errors and errors in the calculation of hydrosulfide component of total alkalinity. Approximations of the vertical distribution of hydrogen sulfide concentration as a function of density σs,t,p using the logistic curve and as a function of density σθ using the exponential curve have the smallest errors, and to the fullest extent possible satisfy the required accuracy for the calculation of hydrosulfide component of total alkalinity.
Supporting agencies: The study was carried out under the state assignment (research theme 0827-2018-0003). The authors highly appreciate valuable recommendations of O.G. Moiseenko, PhD. in Technical Sciences, suggested during the research process.
About the Authors
I. G. Shokurova
Marine Hydrophysical Institute of RAS
Russian Federation
Oceanography Department, Scientific Researcher, PhD. in Geography
Russian Federation
Oceanography Department, Scientific Researcher, PhD. in Geography
E. V. Medvedev
Marine Hydrophysical Institute of RAS
Russian Federation
Sea Biogeochemistry Department, Junior Scientific Researcher
Russian Federation
Sea Biogeochemistry Department, Junior Scientific Researcher
S. I. Kondratev
Marine Hydrophysical Institute of RAS
Russian Federation
Sea Biogeochemistry Department, Senior Scientific Researcher, PhD. in Chemistry
Russian Federation
Sea Biogeochemistry Department, Senior Scientific Researcher, PhD. in Chemistry
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Review
For citations:
Shokurova I.G., Medvedev E.V., Kondratev S.I. Approximation of hydrogen sulfide vertical distribution in the Black Sea. Vestnik Moskovskogo universiteta. Seriya 5, Geografiya. 2019;(5):30-38. (In Russ.)
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