Influence of the dynamics of currents on the hydrophysical structure of the waters and the vertical exchange in the active layer of the Black Sea

Зацепин, А. Г.; Golenko, N. N.; Корж, А. О.; Kremenetskii, V. V.; Пака, В. Т.; Poyarkov, S. G.; Stunzhas, P. A.

doi:10.1134/s0001437007030022

Cited by 31 publications

(17 citation statements)

References 6 publications

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“…Deeper oxygen penetration (on a density scale) in the Bosporus area were expected, in relation with the intermediate lateral injections associated with the Bosporus plume. In addition, deeper oxygen penetration (on a density scale) in the southern and eastern periphery suggests the occurrence of diapycnal ventilation along the steep bathymetry (Zatsepin et al, 2007). The aggregation of the most recent ship-based profiles in the Bosporus area and in the southeastern region (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…As an alternative, using density (isopycnal levels, σ θ ) as vertical coordinate is generally considered a stable solution to assess the vertical migration of the chemocline on a decadal scale (Tugrul et al, 1992;Saydam et al, 1993;Murray et al, 1995). However, the spatial confinement of the lateral oxygen injections associated with the Bosporus plume, as well as the spatial variability of diapycnal ventilating processes (Zatsepin et al, 2007), imposes a horizontal structure to the oxygen penetration depth when expressed in terms of density (Stanev et al, 2004;Glazer et al, 2006). As this spatial gradient might scale with the temporal variations (a range of 0.17 kg m −3 was observed during the Knorr 2003 campaign, Glazer et al, 2006), it has to be considered when deriving interannual trends.…”

Section: Introductionmentioning

confidence: 99%

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Decline of the Black Sea oxygen inventory

et al. 2016

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Decline of the Black Sea oxygen inventory

et al. 2016

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“…In fact, the overall (56 years) trends in winter and annual SST are not significant due to high p ‐values, while SSS exhibits a significant negative trend (Figures and , and Table ). Several authors ( Ginzburg et al ., ; Oguz et al ., ; Oguz et al ., ; Kazmin et al ., ; Zatsepin , ] suggest to cut the long‐time period into several shorter intervals including both warm and cold sub‐intervals. The interval duration varies through the studies but it is approximately within 5–10 years.…”

Section: Long‐term Changesmentioning

confidence: 99%

“…Established SSTs trends do not persist for the entire simulation period. Due to a significant inter-decadal SST variation, there is a high variance in the trends reported [Ginzburg et al, 2004;Oguz et al, 2003;Oguz et al, 2006;Kazmin et al, 2010, Zatsepin, 2007Shapiro et al, 2010]. Moreover, trends based on short records are very sensitive to the beginning and end dates of the recordings and cannot in general reflect long-term climate trends.…”

Section: Surface Propertiesmentioning

confidence: 99%

Black Sea thermohaline properties: Long‐term trends and variations

et al. 2017

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The current knowledge about spatial and temporal dynamics of the Black Sea's thermohaline structure is incomplete because of missing data and sparse distribution of existing measurements in space and time. This study presents 56 year continuous simulations of the Black Sea's hydrodynamics using the 3D General Estuarine Transport Model (GETM), without incorporating any relaxation toward climatological or observational data fields. This property of the model allows us to estimate independent temporal trends, in addition to resolving the spatial structure. The simulations suggest that the intermediate layer temperature is characterized by a weak positive trend (warming), whereas the surface temperature does not show a clear linear trend. Different salinity trends have been established at the surface (negative), upper (weaker negative) and main halocline (positive). Three distinct dynamic periods are identified (1960–1970, 1970–1995, 1995–2015), which exhibit pronounced changes in the Black Sea's thermohaline properties and basin circulation. Strengthening of the main cyclonic circulation, accompanied by intensification of the mesoscale anticyclonic eddy formation is found. Both events strongly affect the sea surface salinity but contribute in opposing directions. Specifically, strong composite large‐scale circulation leads to an increase in sea surface salinity, while enhanced formation of mesoscale anticyclones decreases it. Salinity evolution with time is thus the result of the competition of these two opposing yet interdependent processes.

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“…Cooling and convective mixing processes that occur in winter supply oxygen to the top part of the main pycnocline, where turbulence rapidly decays (Gregg, Yakushev, 2005, Zatsepin et al, 2007.…”

Section: Introductionmentioning

confidence: 99%

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

Ostrovskii

Зацепин

Solovyev

2018

Preprint

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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 2 h were performed using a moored profiler near the shelf break at a depth of 220 m in the northeastern Black Sea from January to early March 2016 to assess the temporal dynamics of the oxygen inventory 10 over the upper part of the continental slope on timescales from hours to months. The moored profiler was equipped with a sensor suit that included the CTD 52-MP CTD with the fast oxygen sensor SBE43F and the acoustic Doppler current meter Nortek Aquadopp 2 MHz, 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 30 m was 24.9 mol m-2. Relatively high/low oxygen inventory cases were related to the thin/thick main 15 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 97-170 m, while the shelf edge depth in this region usually ranges from 90-100 m. Intermittently, the hypoxia boundary depth fluctuated on two time scales: ~17 h due to the inertial oscillations and approximately 5 days due to the current meanders and eddies. 20Further efforts are urgently needed for monitoring the rise of hypoxia onset depth above the shelf break in the Black Sea.

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Influence of the dynamics of currents on the hydrophysical structure of the waters and the vertical exchange in the active layer of the Black Sea

Cited by 31 publications

References 6 publications

Decline of the Black Sea oxygen inventory

Decline of the Black Sea oxygen inventory

Black Sea thermohaline properties: Long‐term trends and variations

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

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