Investigation of Hypoxia in the Eastern Bosporus (the Peter the Great Gulf, the Sea of Japan)

N. I. Grigoryeva

The seasonal distribution of hypoxia in the bottom waters of the Eastern Bosporus (the Peter the Great Gulf, the Sea of Japan) is analyzed based on long-term observational data (2006–2013). It is revealed that in summer the monthly mean concentration of oxygen in the bottom waters considerably decreased as compared to average long-term data. The minimum values of oxygen concentration were registered during four months, from July to October. It is demonstrated that the small values of oxygen concentration are mainly caused by the inflow of hypoxic water from the Amur Bay.