scholarly journals THE CASPIAN SEA LEVEL FLUCTUATIONS INFLUENCE ON THE COASTAL LANDSCAPES OF MANGISTAU AND ATYRAU REGIONS OF KAZAKHSTAN

2016 ◽  
pp. 96-103
Author(s):  
A. S. TABELINOVA
Keyword(s):  
Sea Level ◽  
Caspian Sea ◽  
The Caspian Sea ◽  
Sea Level Fluctuations ◽  
Coastal Landscapes

scholarly journals <i>Lingulodinium machaerophorum</i> expansion over the last centuries in the Caspian Sea reflects global warming

2012 ◽  
Vol 9 (11) ◽  
pp. 16663-16704
Author(s):  
S. A. G. Leroy ◽  
H. A. K. Lahijani ◽  
J.-L. Reyss ◽  
F. Chalié ◽  
S. Haghani ◽  
...  
Keyword(s):  
Sea Level ◽  
Caspian Sea ◽  
Global Climate ◽  
Sediment Cores ◽  
Sea Surface ◽  
Sea Level Changes ◽  
The Caspian Sea ◽  
Sea Level Fluctuations ◽  
Marine Surface ◽  
A Minor

Abstract. We analysed dinoflagellate cyst assemblages in four short sediment cores, two of them dated by radionuclides, taken in the south basin of the Caspian Sea. The interpretation of the four sequences is supported by a collection of 27 lagoonal or marine surface sediment samples. A sharp increase in the biomass of the dinocyst occurs after 1967, especially owing to Lingulodinium machaerophorum. Considering nine other cores covering parts or the whole of Holocene, this species started to develop in the Caspian Sea only during the last three millennia. By analysing instrumental data and collating existing reconstructions of sea level changes over the last few millennia, we show that the main forcing of the increase of L. machaerophorum percentages and of the recent dinocyst abundance is global climate change, especially sea surface temperature increase. Sea level fluctuations likely have a minor impact. We argue that the Caspian Sea has entered the Anthropocene.

Intraannual and interannual variability of storm surges in the North Caspian Sea

2020 ◽  
Vol 3 ◽  
pp. 42-57
Author(s):  
A.V. Pavlova ◽  
◽  
V.S. Arkhipkin ◽  
S.A. Myslenkov ◽  
◽  
...  
Keyword(s):  
Sea Level ◽  
Caspian Sea ◽  
Storm Surges ◽  
Western Coast ◽  
Coastal Zones ◽  
The Caspian Sea ◽  
Sea Level Fluctuations ◽  
The North ◽  
Inundation Area ◽  
Flooded Area

The article presents the results of hydrodynamic modeling of sea level fluctuations in the Caspian Sea using the ADCIRC model for the period from 1979 to 2017. Surges are simulated using an irregular triangulation computational grid with a changing cell size, that easily adapts to changes in shoreline and depth and, therefore, more accurately describes coastal zones. It is found that the seasonal variability of surges is characterized by a maximum in winter and spring and by a minimum in summer. On the western coast of the North Caspian Sea, the maximum sea-level fluctuations are observed in December-February, and on the northern and eastern coasts – in February and March. The areas of inundation of the coastal territory of the Russian sector of the sea are identified. For the surge on March 12–16, 1995, that was one of the most catastrophic ones in terms of its consequences, the inundation area made up 53% of the possible flooded area, and the inundation area for the surge registered on March 27–April 1, 2015 made up 71 %. The more severe consequences of the surge in 1995 are associated with the fact that the mean annual sea level, that determines the possible flooded area, in 1995 was much higher than in 2015. Keywords: ADCIRC, Caspian Sea, unstructured grid, storm surge, sea level, numerical modeling Fig. 11. Ref. 15.

scholarly journals To the methods of geomorphological research (geomorphological lessons of the Caspian)

2019 ◽  
pp. 27-39
Author(s):  
G. I. Rychagov
Keyword(s):  
Sea Level ◽  
Caspian Sea ◽  
World Ocean ◽  
The Caspian Sea ◽  
Risk Zone ◽  
Specific Data ◽  
Sea Level Fluctuations ◽  
Ocean Level ◽  
Modern Physics ◽  
World Ocean Level

The main focus of the article is the significance of the geomorphological method for the reconstruction of paleogeographic events that took place in the Late Pleistocene and Holocene. The specific data obtained as a result of applying this method are given. A reasonable curve of the Caspian Sea level fluctuations in the Holocene was compiled. A risk zone has been defined, within which the level of the Caspian Sea will fluctuate in the future, under modern physics-geographical conditions, which is fundamental importance when planning any economic measures in the coastal zone. Predictions were made and later justified of the Caspian Sea level fluctuations in the 20thearly 21st centuries. The climatic nature of the Caspian transgressions was confirmed. Obtained were new data on the evolution of the shores of the Caspian Sea under rising level conditions, which can be used when forecasting the development of the shores of other seas in the conditions of the present-day rise of the World Ocean level.

scholarly journals SCENARIO FORECASTS OF THE CASPIAN SEA FLUCTUATIONS IN THE LEVEL UNDER CLIMATIC AND MAN-MADE IMPACTS ON THE SEA WATER BALANCE

2019 ◽  
Vol 47 (5) ◽  
pp. 130-148 ◽  
Author(s):  
A. V. Frolov
Keyword(s):  
Water Balance ◽  
Sea Level ◽  
Positive Feedback ◽  
Caspian Sea ◽  
Sea Water ◽  
Nonlinear Dependence ◽  
The Caspian Sea ◽  
Sea Level Fluctuations ◽  
Sea Area

The paper deal with the scenario method for predicting long-term fluctuations in the Caspian Sea level. The scenario forecasts are included: Model of the sea level fluctuations mechanism, Models of the main components of the sea water balance, Morphometric characteristics of sea, Dependence between the outflow of water into the Kara-Bogaz-Gol Bay and the sea level, Assessments of possible direct technogenic impacts on the sea water balance, for example, the withdrawals of water from the inflow into the sea. The Caspian Sea level long-term fluctuations are considered by us as the output process of a non-linear hydrological system. The mechanism of the Caspian level fluctuations contains two negative and one positive feedback. The dependences of the Caspian sea area and the outflow from the sea into the Kara-Bogaz-Gulf bay on the sea level form negative feedbacks. Positive feedback is formed by the nonlinear dependence of evaporation from the sea area on the sea level. Under certain conditions, the effect of this dependence can lead to the sea level bimodal probability distribution density. A necessary (but not sufficient) condition for bimodality is the absence of free seawater inflow from the sea into Kara-Bogaz-Gol. The results of scenario forecasts of the Caspian Sea level developed within the framework of the Caspian Federal Targeted Program (1994-95) are presented. The linear and nonlinear models of the sea level fluctuations used in scenario forecasts are discussed. Failure to take into account of any kind of the feedbacks leads to incorrect predictive estimates of the sea level fluctuations statistical characteristics.

scholarly journals CASPIAN SEA GEODYNAMICAL EVOLUTION EFFECT ON THE SEA LEVEL CHANGING ALONG THE QUATERNARY PERIOD

2018 ◽  
Vol 40 (1) ◽  
pp. 333
Author(s):  
H. Khoshravan
Keyword(s):  
Sea Level ◽  
Caspian Sea ◽  
Human Society ◽  
The Caspian Sea ◽  
Quaternary Period ◽  
Sea Levels ◽  
Sea Level Fluctuations ◽  
Sea Bottom ◽  
Petroleum Wells ◽  
Recent Sediments

The Caspian Sea as the largest lake in the world has different characteristics considering geosciences (Fig. I). In fact sea level changing is the most important happening in this region. Annually fluctuation impact on surrounding coastal area has serious damage and human society meet frequent destroyed phenomena. In this paper we are trying to reconstruct rapid Sea level changing in Holocene epoch by use paleontology evidences such as: Mollusks fossil and sedimentary fades record. In this research 254 Quaternary sediment core samples from exploring petroleum wells (M-l, G3-A) have been evaluated considering above mentioned and also more than 130 sea bottom recent sediments on view of biofacies and biostratigraphy studied. Our investigation results show that in the Caspian Sea basin at the Holocene epoch there are many periodic sea level fluctuations and climatologie impact is most important agent for sea level changing in this basin. Data results are showing that in the studied area there were many periodic rapid sea levels changing during the Quaternary period. The Caspian Sea has several fluctuations along 10,000years ago and its latest begin about 25years ago. Finally we can conclude that Caspian Sea level fluctuation could continue at future similar past time and climatologie impact and tectonic movement are important agents for sea level changing in this region

scholarly journals Reconstruction of Caspian Sea-Level Fluctuations: Radiocarbon Dating Coastal and Bottom Deposits

Radiocarbon ◽  
1993 ◽  
Vol 35 (3) ◽  
pp. 409-420 ◽  
Author(s):  
Yu. A. Karpytchev
Keyword(s):  
Sea Level ◽  
Salt Marshes ◽  
Caspian Sea ◽  
Climatic Changes ◽  
Short Term ◽  
The Caspian Sea ◽  
Sea Level Fluctuations ◽  
The Impact ◽  
Basin Area

Owing to the large basin area of the Caspian Sea, fluctuations in its level reflect climatic changes in the northern hemisphere. To reconstruct these fluctuations, I collected mollusk shells, plant debris, carbonates and organic matter samples for 14C dating from deposits of ancient salt marshes, depressions and bars formed during significant sea-level decline. I studied the impact of eolian sedimentation via parallel dating of carbonates and other materials. The data demonstrate that sea level rises during periods of cooling and falls during warming periods; this is true for both long-term (2–2.5 ka) and short-term climatic changes.

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