Hydrodynamic basis of formation of large-scale water circulation in the Caspian Sea: 2. Numerical calculations

2016 ◽  
Vol 43 (2) ◽  
pp. 292-305 ◽  
Author(s):  
V. N. Zyryanov
Keyword(s):  
Caspian Sea ◽  
Large Scale ◽  
Water Circulation ◽  
Numerical Calculations ◽  
The Caspian Sea

scholarly journals Neolithic developments in the Gorgan Plain, south-east of the Caspian Sea

Antiquity ◽  
2017 ◽  
Vol 91 (358) ◽  
Author(s):  
Kourosh Roustaei ◽  
Jebrael Nokandeh
Keyword(s):  
Caspian Sea ◽  
Large Scale ◽  
The Caspian Sea ◽  
North East ◽  
Ceramic Assemblages

Until about two decades ago, the Neolithic of north-east Iran was known only from a few brief excavation reports: the sites of Yarim Tappeh (Stronach 1972) and Turang Tappeh (Deshayes 1967) on the Gorgan Plain, and preliminary reports of large-scale excavations at the twin mound of Sang-e Chakhmaq in the southern foothills of the eastern Alborz Mountains (e.g. Masuda 1984). In the absence of absolute chronologies, these sites were dated by ceramic assemblages to the sixth millennium BC, and were considered to relate to the so-called ‘Jeitun Culture’ of southern Turkmenistan (Figure 1; Roustaei 2016a).

Large-Scale Pore Pressure Prediction after Pre-Stack Depth Migration in The Caspian Sea

2008 ◽  
Author(s):  
Norbert van de Coevering ◽  
Hazim Hameed Al-Dabagh ◽  
Liau Min Hoe and Tony Jolly
Keyword(s):  
Pore Pressure ◽  
Caspian Sea ◽  
Large Scale ◽  
The Caspian Sea ◽  
Depth Migration ◽  
Pore Pressure Prediction

scholarly journals La place de la mer Caspienne dans la politique étrangère russe

1970 ◽  
pp. 13
Author(s):  
Khagani Guliyev
Keyword(s):  
Foreign Policy ◽  
Soviet Union ◽  
Caspian Sea ◽  
Large Scale ◽  
Russian Foreign Policy ◽  
The Caspian Sea ◽  
The Soviet Union ◽  
New Challenges ◽  
The 19Th Century

This study focuses on the question of the role of the Caspian Sea at a large scale in the current Russian foreign policy. It is noted that though in the historical perspective the Caspian Sea basin had been totally dominated by Russia since the beginning of the 19th century, this domination was contested and considerably reduced after the collapse of the Soviet Union. Paradoxically, in parallel for various reasons exposed in the paper, the Caspian Sea gained more importance in the Russian foreign policy giving rise to new challenges for the future of the Russian power in the region.

Large-scale pore pressure prediction after pre-stack depth migration in the Caspian Sea

First Break ◽  
2007 ◽  
Vol 25 (1111) ◽  
Author(s):  
N. van de Coevering ◽  
H. Hameed Al-Dabagh ◽  
L. Min Hoe ◽  
T. Jolly
Keyword(s):  
Pore Pressure ◽  
Caspian Sea ◽  
Large Scale ◽  
The Caspian Sea ◽  
Depth Migration ◽  
Pore Pressure Prediction

Abrupt changes in wave climate of regional seas caused by large-scale atmospheric forcing and teleconnections

2020 ◽  
Author(s):  
Nadia Kudryavtseva
Keyword(s):  
Baltic Sea ◽  
Caspian Sea ◽  
Large Scale ◽  
Wave Climate ◽  
The Baltic Sea ◽  
The Caspian Sea ◽  
Abrupt Changes ◽  
Wave Heights ◽  
The Baltic

<p>Climate warming is expected to change the functioning of regional seas substantially. However, it is still an open question how the global climate processes will affect in the future the regional seas, their wave climate, changes in the storm surges and, consequently, the coastal erosion, flooding risks, and coastal communities. In this study, we perform a detailed analysis of the wave climate of the Baltic Sea and the Caspian Sea based on the multi-mission satellite altimetry data in 1990 – 2017. The dataset of significant wave heights (SWH) from ten satellites was cross-validated against regional in situ buoy and echosounder measurements. In the Caspian Sea, due to the limited availability of the in-situ measurements, the satellite data were validated with visual wave measurements. After correction for systematic differences, the visual observations showed excellent correspondence with monthly averaged satellite data with a typical root mean square difference of 0.06 m. Even though several satellite pairs (ENVISAT/JASON-1, SARAL/JASON-2, ERS-1/TOPEX) exhibit substantial mutual temporal drift, and calm wave conditions are ignored, the overall picture is very consistent. The averaged over the whole basin annual mean SWH in the Baltic Sea shows an increase of 0.005 m/yr but no significant trend is detected in the Caspian Sea.</p><p>Interestingly, in both Baltic and Caspian seas, changes in the average SWH exhibit a strong spatial pattern. In the Baltic Sea, a meridional pattern is detected: an increase in the central and western parts of the sea and a decrease in the eastern part. This pattern has a timescale of ~13 yr. We also found a faster-varying region in the Baltic Proper where trends in the wave heights experience abrupt changes with a timescale of 3 years and show a strong relation to changes in the North Atlantic Oscillation. In the Caspian Sea, the wave height decreased by 0.019 ± 0.007 m/yr in the eastern segment of the central basin and by 0.04 ± 0.04 m/yr in the western segment of the southern basin when the other parts showed an increase of wave heights. These changes can be explained by an increase in the frequency of westerly winds at the expense of southerly winds. Analysing the changes in the atmospheric forcing we found that there is a cyclic behaviour with a timescale of ~12 years which result in abrupt changes in the wave climate every 12 years, causing the trends in different regions to reverse its sign.</p><p>We demonstrate that the impact on the coast and coastal community is caused by a complex chain of events, starting from changes in the wind direction due to large-scale atmospheric variability and atmospheric teleconnections, which create abrupt shifts in the wave climate of regional seas. We discuss that regional seas have a different response to the changing climate compared to the open ocean condition, which can lead to accelerated coastal erosion and a higher risk of flooding.</p>

scholarly journals Applicability of GRACE and GRACE-FO for monitoring water mass changes of the Aral Sea and the Caspian Sea

2020 ◽  
Vol 26 (2) ◽  
pp. 443-453
Author(s):  
Lorant Földváry ◽  
Victor Statov ◽  
Nizamatdin Mamutov
Keyword(s):  
Gravity Field ◽  
Caspian Sea ◽  
Large Scale ◽  
Aral Sea ◽  
Water Volume ◽  
Satellite Mission ◽  
The Caspian Sea ◽  
Gravity Fields ◽  
Range Rate ◽  
Sea Area

The GRACE gravity satellite mission has provided monthly gravity field solutions for about 15 years enabling a unique opportunity to monitor large scale mass variation processes. By the end of the GRACE, the GRACE-FO mission was launched in order to continue the time series of monthly gravity fields. The two missions are similar in most aspects apart from the improved intersatellite range rate measurements, which is performed with lasers in addition to microwaves. An obvious demand for the geoscientific applications of the monthly gravity field models is to understand the consistency of the models provided by the two missions. This study provides a case-study related consistency investigation of GRACE and GRACE-FO monthly solutions for the Aral Sea region. As the closeness of the Caspian Sea may influence the monthly mass variations of the Aral Sea, it has also been involved in the investigations. According to the results, GRACE-FO models seem to continue the mass variations of the GRACE period properly, therefore their use jointly with GRACE is suggested. Based on the justified characteristics of the gravity anomaly by water volume variations in the case of the Aral Sea, GRACE models for the period March–June 2017 are suggested to be neglected. Though the correlation between water volume and monthly gravity field variations is convincing in the case of the Aral Sea, no such a correlation for the Caspian Sea could have been detected, which suggests to be the consequence of other mass varying processes, may be related to the seismicity of the Caspian Sea area.

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