Natural-climatic and anthropogenic factors determining the self-purification capacity of shallow-water marine ecosystems in relation to reduced nitrogen forms

E. E. Sovga1*, I. V. Mezentseva2, T. V. Khmara1

1 Marine Hydrophysical Institute of RAS, Sevastopol, Russia

2 Sevastopol Branch of the N. N. Zubov State Oceanographic Institute, Sevastopol, Russia

* e-mail: science-mhi@mail.ru

Abstract

The paper considers natural-climatic and anthropogenic factors that determine differences in the self-purification capacity of the Sevastopol Bay ecosystems (its western, central, eastern parts and the Yuzhnaya Bay) in relation to the reduced nitrogen forms (ammonium and nitrites) by calculating the assimilation capacity. The authors took into account the intensity of the input sources of the studied forms of nitrogen, the rate of excretion from the ecosystem, the dynamic situation in the studied water areas and in the entire bay as well as the location of recreational facilities. For the first time, the factors were assessed that provide additional input of reduced forms of nitrogen associated with hypoxia during summer water stratification in local deepened areas in the upper bottom sediment layer, taking into account their particle size distribution. Further, the authors considered accumulation of organic matter and its destruction due to oxidized nitrogen forms and formation of reduced forms thereof. The currents in the central and southern parts of the Sevastopol Bay were calculated using a hydrodynamic model. The calculation results correspond to the current system in the mentioned water areas of the bay according to in situ data at different wind situations in the region. According to the calculations, it is possible that under certain hydrometeorological situations additional amount of ammonium and nitrites would flow from the Yuzhnaya Bay into the central part of the Sevastopol Bay.

Keywords

Sevastopol Bay, central part, Yuzhnaya Bay, current system, self-purifi- cation ability, ammonium, inorganic nitrogen, bottom sediments

Acknowledgments

The research is performed under state task on topic № 0827-2020-0004 “Coastal studies”.

For citation

Sovga, E.E., Mezentseva, I.V. and Khmara, T.V., 2021. Natural-climatic and anthropogenic factors determining the self-purification capacity of shallow-water marine ecosystems in relation to reduced nitrogen forms. Ecological Safety of Coastal and Shelf Zones of Sea, (3), pp. 23–36. doi:10.22449/2413-5577-2021-3-23-36 (in Russian).

DOI

10.22449/2413-5577-2021-3-23-36

References

  1. Ivanov, V.A., Ovsyany, E.I., Repetin, L.N., Romanov, A.S. and Ignatyeva, O.G., 2006. Hydrological and Hydrochemical Regime of the Sebastopol Bay and Its Changing under Influence of Climatic and Anthropogenic Factors. Sevastopol: MHI NAS of Ukraine, 90 p. (in Russian).
  2. Sovga, E.E., Mezentseva, I.V. and Slepchuk, K.A., 2020. Comparison of Assimilative Capacity and Trophic Index for Various Parts of the Sevastopol Bay Water Area. Ecological Safety of Coastal and Shelf Zones of Sea, (3), pp. 63–76. doi:10.22449/2413-5577-2020-3-63-76 (in Russian).
  3. Ivanov, V.A., Mezentceva, I.V., Sovga, E.E., Slepchuk, K.A. and Khmara, T.V., 2015. Assessment Self-Purification Ability of the Sevastopol Bay Ecosystem in Relation to Inorganic Forms of Nitrogen. Processes in Geomedia, (2), pp. 55–65 (in Russian).
  4. Izrael, Yu.A. and Tsyban, A.V., 1989. [Anthropogenic Ecology of the Ocean]. Moscow: Gidrometeoizdat, 529 p. (in Russian).
  5. Ivanov, V.A. and Tuchkovenko, Yu.S., 2008. Applied Mathematical Water-Quality Modeling of Shelf Marine Ecosystems. Sevastopol: ECOSI-Gidrofizika, 311 p. (in Russian).
  6. Kondratev, S.I. and Vidnichuk, A.V., 2020. Local Seasonal Hypoxia and Hydrogen Sulphide Formation in the Bottom Waters of the Sevastopol Bay in 2009–2019. Ecological Safety of Coastal and Shelf Zones of Sea, (2), pp. 107–121. doi:10.22449/2413-5577-2020-2-107-121 (in Russian).
  7. Sovga, E.E. and Khmara, T.V., 2020. Influence of the Chernaya River Runoff during High and Low Water on the Ecological State of the Apex of the Sevastopol Bay Water Area. Physical Oceanography, 27(1), pp. 28-36. doi:10.22449/1573-160X-2020-1-28-36
  8. Ryabtsev, Yu.N., Verzhevskaia, L.V., Rauen, T.V., Tsyganova, M.V., Nikishin, V.V. and Bagaev, A.V., 2021. Search for an Optimal Configuration of Projected Municipal Sewerage Outfalls in the Sevastopol Bay using Computational Modelling and Geoinformation Analysis. Ecological Safety of Coastal and Shelf Zones of Sea, (1), pp. 111–128. doi:10.22449/2413-5577-2021-1-111-128 (in Russian).
  9. Malakhova, T.V., Malakhova, L.V., Budnikov, A.A. and Ivanova, I.N., 2020. Spatio-Temporal Dynamics of Methane Content in the Sevastopol Bay and its Emission to the Atmosphere. Vestnik Moskovskogo Universiteta. Seria 5, Geografia, (3), pp. 73–80 (in Russian).
  10. Morozov, A.N., Lemeshko, E.M., Shutov, S.A. and Zima, V.V., 2012. [Currents in the Sevastopol Bay according to ADCP Observational Data (June 2008)]. Morskoy Gidrofizicheskiy Zhurnal, (3), pp. 31–43 (in Russian).
  11. Lemeshko, E.M., Morozov, A.N., Shutov, S.A., Zima, V.V. and Chepyzhenko, A.A., 2014. [Currents in the Sevastopol Bay according to ADCP Observational Data (June 2008)]. In: MHI, 2014. Ekologicheskaya Bezopasnost' Pribrezhnykh i Shel'fovykh Zon i Kompleksnoe Ispol'zovanie Resursov Shel'fa [Ecological Safety of Coastal and Shelf Zones and Comprehensive Use of Shelf Resources]. Sevastopol: ECOSI-Gidrofizika. Iss. 28, pp. 25–30 (in Russian).
  12. Sovga, E.E., Mezentseva, I.V., Khmara, T.V. and Slepchuk, K.A., 2014. [On Prospects and Possibility of Assessment of Self-Purification Ability of the Sevastopol Bay Water Area]. In: MHI, 2014. Ekologicheskaya Bezopasnost' Pribrezhnykh i Shel'fovykh Zon i Kompleksnoe Ispol'zovanie Resursov Shel'fa [Ecological Safety of Coastal and Shelf Zones and Comprehensive Use of Shelf Resources]. Sevastopol: ECOSI-Gidrofizika. Iss. 28, pp. 153–164 (in Russian).

Full text

English version (PDF)

Russian version (PDF)