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Discussion papers
https://doi.org/10.5194/os-2018-91
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2018-91
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 13 Aug 2018

Research article | 13 Aug 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

The temporal variability of oxygen inventory in the NE Black Sea slope water

Alexander G. Ostrovskii, Andrey G. Zatsepin, and Vladimir A. Solovyev Alexander G. Ostrovskii et al.
  • Shirshov Institute of Oceanology, Russian Academy of Sciences, 36, Nahimovskiy prospekt, Moscow, 117997, Russia

Abstract. The time series of vertical profiles of hydrophysical parameters and dissolved oxygen are critical for identifying trends in water column stratification, mixing, and ventilation in the Black Sea. Due to global warming, warm winters have recently become common over the Black Sea, and the temperature in the cold intermediate layer (CIL) is increasing. Regular measurements that are as frequent as every 2h were performed using a moored profiler near the shelf break at a depth of 220m in the northeastern Black Sea from January to early March 2016 to assess the temporal dynamics of the oxygen inventory over the upper part of the continental slope on timescales from hours to months. The moored profiler was equipped with a sensor suite that included the CTD 52-MP CTD with the fast oxygen sensor SBE43F and the acoustic Doppler current meter Nortek Aquadopp 2MHz, which allowed for direct observations of the CIL temperature, the pycnocline structure, the current velocity and the oxygen stratification, in particular, the depths of the hypoxia onset. The average oxygen inventory below a depth of 30m was 24.9molm−2. Relatively high/low oxygen inventory cases were related to the thin/thick main pycnocline that was associated with the inshore/offshore location of the Black Sea Rim Current. The pycnocline hindered the vertical transport of oxygenated water to the CIL. The new CIL emerged by horizontal advection above the pycnocline only at the end of the observational survey. The vertical displacements of the hypoxia onset depth ranged from 97–170m, while the shelf edge depth in this region usually ranges from 90–100m. Intermittently, the hypoxia boundary depth fluctuated on two-time scales: ~17h due to the inertial oscillations and approximately 5 days due to the current meanders and eddies. Further efforts are urgently needed for monitoring the rise of hypoxia onset depth above the shelf break in the Black Sea.

Alexander G. Ostrovskii et al.
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Alexander G. Ostrovskii et al.
Alexander G. Ostrovskii et al.
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Short summary
Time series of vertical profiles of hydrophysical parameters and oxygen are critical for identifying trends in ventilation in the NE Black Sea. Such frequent measurements were performed using a moored profiler over the continental slope in winter 2016. For a brief period of time, the hypoxia onset depth rose to 97 m, the highest elevation ever recorded. Whereas the shelf edge depth in this region usually ranges from ~ 100 m there is a risk of spreading of hypoxic bottom-water to the outer shelf.
Time series of vertical profiles of hydrophysical parameters and oxygen are critical for...
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