scholarly journals Analysis of deep-water exchange in the Caspian Sea based on environmental tracers

2000 ◽  
Vol 47 (4) ◽  
pp. 621-654 ◽  
Author(s):  
F. Peeters ◽  
R. Kipfer ◽  
D. Achermann ◽  
M. Hofer ◽  
W. Aeschbach-Hertig ◽  
...  
Keyword(s):  
Deep Water ◽  
Caspian Sea ◽  
Water Exchange ◽  
Environmental Tracers ◽  
The Caspian Sea

scholarly journals Specialty of vertical water exchange of the Caspian sea on the basis of distribution of transient tracers

2019 ◽  
Vol 46 (5) ◽  
pp. 496-502
Author(s):  
V. S. Brezgunov
Keyword(s):  
Deep Water ◽  
Surface Waters ◽  
Caspian Sea ◽  
Large Scale ◽  
Water Exchange ◽  
Vertical Structure ◽  
Gravitational Convection ◽  
The Caspian Sea ◽  
Structure Of Water ◽  
Geochemical Studies

The analysis of the reliability of different scenarios for the formation of the vertical structure of the waters of the Caspian Sea, obtained from the distribution of transient tracers (CFC-11, CFC-12, 3H and 3He) at the deep-water stations of the Middle and Southern Caspian within the framework of international integrated isotope-geochemical studies during the maximum sea level rise in 1995–1996. Taking into account the available hydrometeorological data and the characteristics of water dating using transient tracers, it was concluded that after large-scale gravitational convection in the Middle Caspian caused by anomalous cooling of surface waters in the Northern Caspian at the end of the winter of 1976, a structure of water masses was formed that excluded deep water ventilation in the Middle and South Caspian Sea until the mid-90s.

Hydrochemical Studies of Deep-Water Basins of the Caspian Sea in August–September 2013 Onboard the R/V “Nikifor Shurekov”

2015 ◽  
Vol 55 (1) ◽  
pp. 162-164
Author(s):  
L. A. Dukhova ◽  
E. A. Serebrennikova ◽  
A. K. Ambrosimov ◽  
A. A. Klyuvitkin
Keyword(s):  
Deep Water ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Hydrochemical Studies

Hydrochemistry and nutrient distribution in southern deep-water basin of the Caspian Sea

2018 ◽  
Vol 127 ◽  
pp. 406-411 ◽  
Author(s):  
Abolfazl Saleh ◽  
Ali Hamzehpour ◽  
Ali Mehdinia ◽  
Kazem Darvish Bastami ◽  
Said Mazaheri
Keyword(s):  
Deep Water ◽  
Caspian Sea ◽  
Nutrient Distribution ◽  
The Caspian Sea ◽  
Water Basin ◽  
Deep Water Basin

scholarly journals Interannual Variability of Water Exchange Anomalies Between the Northern, Middle and Southern Caspian Based on Satellite Altimetry Data

2019 ◽  
Vol 25 ◽  
pp. 106-115 ◽  
Author(s):  
Sergey A. Lebedev ◽  
Andrey G. Kostianoy
Keyword(s):  
Caspian Sea ◽  
Seasonal Variability ◽  
Satellite Altimetry ◽  
Water Exchange ◽  
Western Coast ◽  
Altimetry Data ◽  
The Caspian Sea ◽  
Volga River ◽  
Geostrophic Velocities ◽  
Satellite Altimetry Data

The paper presents the results of estimation of interannual and seasonal variability of water exchange between the Northern, Middle and Southern Caspian Sea based on the TOPEX/Poseidon and Jason–1/2/3 satellite altimetry data. The boundaries between the Caspian Sea sub-basins were taken along the 133 and 209 tracks of the satellites. Temporal variability of surface geostrophic velocities directed perpendicular to the tracks showed that positive values correspond to the southeast direction of the currents, negative values correspond to the northwest direction. It is clearly seen that the main water exchange associated with the Volga River runoff is concentrated along the western coast of the Caspian Sea. In this area, anomalies of geostrophic velocities exceed 20 cm/s. Total water exchange anomalies through the 133 and 209 tracks show seasonal variability with an amplitude up to ±18x105 m3/s for track 133 (a line between the Northern and Middle Caspian) and ±11x105 m3/s for track 209 (a line between the Middle and Southern Caspian). The maximum values of water exchange anomalies were observed in 1993, 1994 and 2012 through 133 track (±16-18x105 m3/s) and in 1993, 1996 and 1997 (±11x105 m3/s) through 209 track.

scholarly journals Assessment of Changes in the Structure of Zooplankton Communities to Infer Water Quality of the Caspian Sea

Diversity ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 122 ◽  
Author(s):  
Elena Krupa
Keyword(s):  
Water Quality ◽  
Deep Water ◽  
Caspian Sea ◽  
Size Structure ◽  
The Caspian Sea ◽  
Structural Variables ◽  
Zooplankton Communities ◽  
Average Individual ◽  
Individual Mass

The work aimed to study the structural variables of zooplankton to assess the water quality of the Caspian Sea. Studies of zooplankton were conducted in the spring and summer of 2008 and 2010. Abundance, biomass, an average individual mass of a specimen, Shannon Bi, Shannon Ab, Δ-Shannon indices, and Clarke’s W-statistic were calculated for zooplankton. Quantitative variables of zooplankton were the highest in the Northeastern and Northern Caspian, decreasing towards the Middle Caspian. In the Northeastern and Northern Caspian from spring to summer, the number of zooplankton, and the values of Shannon Bi and Shannon Ab indices decreased; the values of Δ-Shannon and Clarke’s W-statistic increased. In the Middle Caspian, the biomass of the community increased; the values of Δ-Shannon and Clarke’s W-statistic decreased. From spring to summer, the value of an average individual mass of a specimen decreased over the entire surveyed area. The jellyfish Blackfordia virginica and Moerisia pallasi significantly influenced the size structure of the holoplankton. Seasonal dynamics of structural variables of zooplankton as well as changes in water transparency showed that water quality improved from spring to summer in the shallow northern and northeastern areas of the sea, and decreased in the deep-water Middle Caspian.

Special features of the hydrochemical conditions variability in the deep water basins of the Caspian Sea

Oceanology ◽  
2015 ◽  
Vol 55 (2) ◽  
pp. 194-199 ◽  
Author(s):  
E. A. Serebrennikova ◽  
V. V. Sapozhnikov ◽  
L. A. Dukhova
Keyword(s):  
Deep Water ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Hydrochemical Conditions
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