Field Measurements of Sea Currents on the Mangistau Shelf of the Caspian Sea

Zavialov, Peter; Kurbaniyazov, A. K.; Kayupov, A. A.; Koibakova, S. E.; Kremenetsky, V. V.; Сапожников, Ф. В.; Syrlybekkyzy, Samal

doi:10.1134/s0001437022040142

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…Seawater temperature and salinity changes in the deep layers were few. The results obtained in this research were agreed the results of other studies in different sea areas (Tuzhilkin and Kosarev, 2005;Zaker et al, 2007;Zavialov et al, 2022). Evaluations of salinity and temperature recorded data showed that the thermohaline structure has vertical and horizontal = ) (Kosarev, 1990;Kosarev and Yablonskaya, 1994;Tuzhilkin et al, 1997;Ibraev et al, 1998;Ibrayev, 2001;Ibrayev et al, 2001;Tuzhilkin and Kosarev, 2004;Nasimi and Ghiassi, 2006;Zounematkermani and Sabbaghyazdi, 2010;Kitazawa and Yang, 2012;Cutroneo et al, 2017;Jamshidi, 2017;Medvedev et al, 2020).…”

Section: Data Availability Statementsupporting

confidence: 91%

“…Throughout the entire duration of measurements, the direction of components of sea flow was signalternating. During the observations, winds by variable strength up to 10 m/s were recorded almost exclusively from north and northwest directions (dominant in winter in the area) (Terziev et al, 1992;Zavialov et al, 2022). However, in a few cases, a strong wind with a speed of up to 18 m/s was recorded from the southeast (Figures 5, 6).…”

Section: Wind Variabilitymentioning

confidence: 95%

“…The results of measurements of physical properties such as temperature, salinity, and sigma-T are presented in Figure 12A-D. Variations in thermal and density stratifications are clearly observed in the multi-axis's diagrams (for more information and comparison, refer to Ambrosimov et al, 2011;Dyakonov and Ibrayev, 2019;Zavialov et al, 2022).…”

Section: Hydrophysical Studiesmentioning

confidence: 99%

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Flow measurement in the southern coast of the Caspian Sea

Jamshidi

2024

Front. Mar. Sci.

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Oceanographic monitoring was conducted in the southern basin of the Caspian Sea to evaluate the physical structure of seawater and sea currents. This monitoring aimed to gather data and analyze the characteristics of the seawater, including temperature, salinity, density, and other relevant parameters. Additionally, the monitoring also focused on studying the patterns and dynamics of sea currents in the region. The collected data and analysis from this monitoring period provided valuable insights into the oceanographic conditions of the southern basin of the Caspian Sea. During storm events, a high level of correlation between the current and wind data was observed in the southern basin of the Caspian Sea during the 2017-2018 monitoring period. The measured current data indicated that the predominant directions were north (N) and northwest (NW). It was observed that strong gusts predominantly originated from the north (N) and northwest (NW) directions. Additionally, a smaller portion of the strong gusts was observed to come from the South-Southeast (S-SE) direction. These findings indicate that the prevailing wind patterns during the monitoring period were primarily from the north and northwest, with a lesser contribution from the South-Southeast direction. The current profiles observed during the monitoring period in the southern basin of the Caspian Sea were primarily influenced by the general circulation pattern of the region. This circulation pattern played a significant role in shaping the current profiles observed during the measurements. In terms of the surface current speed, the maximum recorded value was approximately 200 cm/s, which occurred in January. This indicates that there were instances of relatively high-speed currents in the southern basin of the Caspian Sea during that time. The evaluation of inter-annual variability in vertical structure and seawater temperature profiles during the monitoring period confirmed the presence of seasonal stratification in the water column of the southern basin of the Caspian Sea. This stratification was observed to consist of different layers, including the surface mixed layer, thermocline, and deep-water layers. The formation of these layers is indicative of the seasonal variations in temperature and density within the water column. The vertical changes in the water’s physical parameters during the monitoring period revealed the formation of stratification in the southern basin of the Caspian Sea. In March, it was observed that the water temperature decreased from 11.5°C at the surface to 8.5°C at a depth of 100 m, indicating the presence of a temperature gradient. As the monitoring progressed into May, the stratification became stronger, with the surface water temperature reaching around 23°C. By August, the surface layer of the sea water experienced a significant increase in temperature, reaching 29°C. These observations highlight the development of stratification and the seasonal variations in water temperature during the monitoring period in spring and summer seasons. The water temperature beneath the thermocline layer, specifically at a depth of 100 meters, was recorded to be around 8-8.5 oC. Additionally, the water salinity in the water column exhibited fluctuations between 12-12.5 (psu). Monitoring and understanding physical properties variations are crucial for assessing the oceanographic conditions and their potential impact on marine ecosystems in the southern basin of the Caspian Sea.

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Section: Data Availability Statementsupporting

confidence: 91%

Section: Wind Variabilitymentioning

confidence: 95%

Section: Hydrophysical Studiesmentioning

confidence: 99%

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Flow measurement in the southern coast of the Caspian Sea

Jamshidi

2024

Front. Mar. Sci.

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“…The pycnocline is located at 50-200 m depth, and vertical turbulent transfer is heavily suppressed in this layer. The RC core is generally situated near the base of the Black Sea continental slope, about 10-30 km from the shore in the northeastern part (where the shelf and continental slope are narrow), and 50 km and further from the shore in the northwestern part (where the shelf and continental slope are wide) [15][16][17]. The velocity inside the RC core occasionally reaches 1 m/s or greater, but the average speed of the RC is 0.15-0.20 m/s [18].…”

Section: Introductionmentioning

confidence: 99%

Upwellings and Downwellings Caused by Mesoscale Water Dynamics in the Coastal Zone of Northeastern Black Sea

Podymov,

Ocherednik,

Silvestrova

et al. 2023

JMSE

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The paper analyzes quasiperiodic upwellings and downwellings on the shelf and upper part of continental slope of the northeastern Black Sea. It is shown that these processes are related to changes in intensity and direction of alongshore current and the following geostrophic adjustment of the density field. The source of such changes is the meandering of the Black Sea Rim Current (RC). It leads to a quasiperiodic change in direction of the alongshore current, from northwestern (cyclonic RC meander) to southeastern (anticyclonic RC meander, or eddy). These cycles, or phases, have an average duration of about 10 days. During the northwestern phase, the permanent Black Sea pycnohalocline (hereafter pycnocline) and seasonal thermocline descend, their thickness increases, and so does the thickness of the upper mixed layer (UML). During the southeastern phase, both the pycnocline and seasonal thermocline ascend and become thinner, along with the UML, which also becomes thinner. In both phases, isopycnals in the pycnocline and isotherms in the thermocline demonstrate quasi-in-phase vertical oscillations, which have a good correlation with the speed and direction of the alongshore current. These correlations allow estimation of the magnitude of upwellings and downwellings in the shelf–slope area of the northeastern Black Sea using data series of current velocity profiles.

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Upwellings and Downwellings Caused By Mesoscale Water Dynamics in the Coastal Zone of North-Eastern Black Sea

Подымов¹,

Ocherednik²,

Silvestrova³

et al. 2023

Preprint

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The paper analyzes quasiperiodic upwellings and downwellings on the shelf and upper part of continental slope of the north-eastern Black Sea. It is shown that these processes are related to changes in intensity and direction of alongshore current and the following geostrophic adjustment of density field. The source of such changes is a meandering of the Black Sea Rim Current (RC). It leads to a quasi-periodic change of direction of the alongshore current, from north-western (cyclonic RC meander) to south-eastern (anticyclonic RC meander, or eddy). These cycles, or phases, have average duration about 10 days. During the north-western phase, the permanent Black Sea pycno-halocline (hereafter pycnocline) and seasonal thermocline descend, their thickness increases, and so does the thickness of the upper mixed layer (UML). During the south-eastern phase both pycnocline and seasonal thermocline ascend and become thinner, along with the UML, which also becomes thinner. In both phases, isopycnals in the pycnocline and isotherms in the thermocline demonstrate quasi-in-phase vertical oscillations, which have a good correlation with speed and direction of the alongshore current. These correlations allow estimation of the magnitude of upwellings and downwellings in the shelf-slope area of the north-eastern Black Sea using data series of current velocity profiles.

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Field Measurements of Sea Currents on the Mangistau Shelf of the Caspian Sea

Cited by 3 publications

References 6 publications

Flow measurement in the southern coast of the Caspian Sea

Flow measurement in the southern coast of the Caspian Sea

Upwellings and Downwellings Caused by Mesoscale Water Dynamics in the Coastal Zone of Northeastern Black Sea

Upwellings and Downwellings Caused By Mesoscale Water Dynamics in the Coastal Zone of North-Eastern Black Sea

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