Comprehensive study of the Caspian Sea in voyage 32 of R/V Rift

Ambrosimov, A. K.; Lukashin, Vyacheslav N; Burenkov, V. I.; Кравчишина, М. Д.; Libina, N. V.; Mutovkin, A. D.

doi:10.1134/s0001437011040011

Cited by 10 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…The current speed in the center of the sub-basin gyres ranges between 0.05-0.10 ms -1 while it is estimated about 0.20 ms -1 at the borders of the gyres with reverse directions (Tuzhilkin and Kosarev, 2005). Total changes and patterns of sea currents in the southern regions are mainly influenced by the wide range flow and seasonal changes of the dipoles, thermohaline variations and climate changes (Kosarev, 2005;Lukashin et al, 2010;Lukashin et al, 2010;Ambrosimov et al, 2011;Ambrosimov et al, 2012;Nicholls et al, 2012;Sharbaty, 2012;Dyakonov and Ibrayev, 2019). Also, the effect of sea-breeze on formation the regional current in the southern part pf the sea was evaluated and reported (Sharbaty, 2012;Bohluly et al, 2018;Mofidi and Rashidi, 2018).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flow measurement in the southern coast of the Caspian Sea

Jamshidi

2024

Front. Mar. Sci.

View full text Add to dashboard Cite

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.

show abstract

Section: Hydrophysical Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow measurement in the southern coast of the Caspian Sea

Jamshidi

2024

Front. Mar. Sci.

View full text Add to dashboard Cite

show abstract

“…The Caspian Sea is a highly productive basin with unique biological resources. In the first decades of the 21st century, structural deformations are noted at all trophic levels in the ecosystem of the Caspian Sea, which are caused by both global climate change and anthropogenic factors [1][2][3][4][5][6][7]. As the primary production link, phytoplankton determines the functioning of higher trophic levels and is the most sensitive and vulnerable component of the marine ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Seasonal and Long-Term Phytoplankton Dynamics in the Middle Caspian According to Satellite Data and In Situ Observations in the First Decades of the 21st Century

Востоков

Паутова

Sahling

et al. 2023

JMSE

View full text Add to dashboard Cite

Seasonal and long-term variability of phytoplankton in the Middle Caspian was studied based on remote sensing data of the sea by SeaWiFS and MODIS-Aqua scanners in 1998–2021 and the results of field observations in 2004–2021. The seasonal variability of chlorophyll “a” (CHL) calculated from satellite data using a regional algorithm indicated that the autumn and winter seasons were the main phytoplankton production periods of the year. In summer, a period of stagnation was observed in phytoplankton growth in the surface layer. However, according to satellite data in the first months of each year, winter blooms were observed recurrently in the Middle Caspian Sea, as confirmed by the results of field observations in 2004–2021. The phytoplankton biomass during the winter vegetation period reached 4.5–5.0 g/m3. In the first decade of the century (2004–2006), winter blooms were almost entirely (as much as 96%) formed through the mass growth of the alien diatom Cerataulina pelagica. In the modern period (2021), the winter bloom was formed both by three endemic diatom species Thalassionema nitzschioides, Cyclotella comta and Dactyliosolen fragilissimus and by two alien species Pseudo-nitzschia seriata and Cerataulina pelagica. In spring, the diatom Cyclotella caspia and the dinoflagellate Prorocentrum micans, both endemics, dominated. In summer, the phytoplankton biomass was composed of the mass growth of small flagellates and dinoflagellates in the seasonal thermocline layer, which current remote sensing methods cannot record. The diatoms’ contribution to the community’s total biomass in summer did not exceed 3%. In the autumn phytoplankton, the main role was played by a diatom component represented by alien species, mainly Chaetoceros peruvianus.

show abstract

Variations of dissolved oxygen concentrations under influence of seasonal stratification using deep-water observations in the southern region of the Caspian Sea

Jamshidi

2022

Arab J Geosci

View full text Add to dashboard Cite

Comprehensive study of the Caspian Sea in voyage 32 of R/V Rift

Cited by 10 publications

References 1 publication

Flow measurement in the southern coast of the Caspian Sea

Flow measurement in the southern coast of the Caspian Sea

Seasonal and Long-Term Phytoplankton Dynamics in the Middle Caspian According to Satellite Data and In Situ Observations in the First Decades of the 21st Century

Variations of dissolved oxygen concentrations under influence of seasonal stratification using deep-water observations in the southern region of the Caspian Sea

Contact Info

Product

Resources

About