статья в журнале

En

Ecological Safety of Coastal and Shelf Zones of Sea

ISSN:24135577

2023

Mezentseva, I.V.¹

MQUMMV

The paper uses the 2012-2020 joint oceanographic database of MHI RAS and SB FSBI SOI to estimate the self-purification capacity of Sevastopol Bay ecosystems in relation to biogenic nitrogen and phosphorus. The assimilation capacity and its specific value were calculated using the balance method. The paper estimates the average and maximum concentrations of inorganic phosphorus (PO4) and nitrogen (NO2, NO3, NH4), as well as the average and maximum rates and time of removal of these nutrients from the bay ecosystems. The paper shows changes in the percentage of forms of inorganic nitrogen (NO2, NO3, NH4) in the water area of all parts of Sevastopol Bay for two periods (1998- 2012 and 2012-2020). These changes had a greater impact on the content of the reduced form of ammonium nitrogen which has increased in all ecosystems of the bay in recent years. Changes in the self-purification capacity of the bay ecosystems were manifested as a spread of data on the assimilation capacity of the study ecosystems in relation to nutrients. At the same time, the lowest self-purification capacity was observed for the ecosystem of the eastern part of the bay. The paper assesses possible causes of the observed situation, which are associated with changes in the wind regime over the bay water area in the last decade and the resulting formation of the system of surface currents. The surface currents in the bay under prevailing easterly winds were calculated using the computational modeling method.

assimilation capacity, biogenic nitrogen, biogenic phosphorus, ecosystem, selfpurification ability, Sevastopol Bay, surface currents

2024-05-15 15:47:41