Numerical simulation of waves in the Caspian Sea: calibration and verification of the observation-based source terms

A hydrostatic and ice coupled model was developed to analyze circulation and thermohaline structures in the Caspian Sea. The northern part of the Caspian Sea freezes in the winter. Waters start icing in November and ices spread during December and January. The northern part of the Caspian Sea is covered by ices in severe winters. Ice-covered area is at its maximum during January and February, and then ices begin melting in March and disappear in April. The occurrence of ices must have significant effects on circulation and thermohaline structures as well as ecosystem in the northern Caspian Sea. In the present study, formation of ices is modeled assuming that ices do not move but spread and shrink on water surface. Under the ices, it is assumed that the exchange of momentum flux is impeded and the fluxes of heat and brine salt are given at sea-ice boundary. The ice model was coupled with a hydrostatic model based on MEC (Marine Environmental Committee) Ocean Model developed by the Japan Society of Naval Architect and Ocean Engineers. Numerical simulation was carried out for 20 years to achieve stable seasonal changes in current velocity, water temperature, and salinity. The fluxes of momentum, heat, and salt were estimated by using measurement data at 11 meteorological stations around the Caspian Sea. Inflow of Volga River was taken into account as representative of all the rivers which inflow into the Caspian Sea. Effects of icing event on circulation and thermohaline structures were discussed using the results of numerical simulation in the last year. As a result, the accuracy of predicting water temperature in the northern Caspian Sea was improved by taking the effects of icing event into account. Differences in density in the horizontal direction create several gyres with the effects of Coriolis force. The differences were caused by differences in heat capacity between coastal and open waters, differences in water temperature due to climate, and inflow of rivers in the northern Caspian Sea. The water current field in the Caspian Sea is formed by adding wind-driven current to the dominant density-driven current, which is based on horizontal differences in water temperature and salinity, and Coriolis force.

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NUMERICAL SIMULATION OF THE CASPIAN SEA CIRCULATION USING THE MARINE AND ATMOSPHERIC RESEARCH SYSTEM

Proceedings of the Karelian Research Centre of the Russian Academy of Sciences ◽

10.17076/lim310 ◽

2016 ◽

pp. 21 ◽

Cited By ~ 3

Author(s):

Николай Ардальянович Дианский ◽

Владимин Васильевич Фомин ◽

Татьяна Юрьевна Выручалкина ◽

Гусев Анатолий Владимирович ◽

Nikolay Diansky ◽

...

Keyword(s):

Numerical Simulation ◽

Caspian Sea ◽

Research System ◽

The Caspian Sea ◽

Atmospheric Research

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Numerical Simulation of the Wind-Induced Current in the Caspian Sea

International Journal of coastal and offshore engineering ◽

10.29252/ijcoe.2.1.67 ◽

2018 ◽

Vol 2 (1) ◽

pp. 67-77

Author(s):

Jalal Mofidi ◽

Akbar Rashidi Ebrahim Hesari ◽

◽

Keyword(s):

Numerical Simulation ◽

Caspian Sea ◽

Induced Current ◽

The Caspian Sea

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'Those new states to the east of the Caspian Sea': Ireland and Central Asia

Irish Studies in International Affairs ◽

10.3318/isia.2007.18.109 ◽

2007 ◽

Vol 18 (-1) ◽

pp. 109-129

Author(s):

Rob Kevlihan

Keyword(s):

Central Asia ◽

Caspian Sea ◽

The Caspian Sea ◽

New States

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THE NUMBER AND QUALITATIVE CHARACTERISTICS OF FRY FISH IN SHALLOW COASTAL WATERS OF THE VOLGA IN THE SUMMER-AUTUMN PERIOD OF 2012

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2017-3-65-73 ◽

2017 ◽

pp. 65-73

Author(s):

Edward Vladimirovich Nikitin

Keyword(s):

Fish Species ◽

Coastal Waters ◽

Caspian Sea ◽

The Caspian Sea ◽

Volga River ◽

Commercial Fish ◽

Autumn Period ◽

Fish Juveniles ◽

Qualitative Characteristics ◽

Shallow Coastal Waters

Shallow coastal waters of the Volga river is a flooded feeding area for fish juveniles of nonmigratory fish species. There takes place annual downstream migration of fluvial anadromous fish species from spawning grounds of the Volga river to the Northern Caspian Sea. The most important factors determining the number and qualitative characteristics of fry fishes are the level of the Caspian Sea (currently having a tendency to the lowering), hydrological and thermal regimes of the Volga river. Researches were carried out in definite periods of time. In the summer-autumn period of 2012 fry fishes were presented by 19 species (13 of them were commercial species), which belonged to 9 families. The article gives data on all the commercial fish species. In the first decade of July the maximum number of fry fish was registered in the western part of the Volga outfall offshore - in box 247 (19.86 mln specimens/km2), in the eastern part - in box 142 (20.4 mln specimens/km2). The most populous were roach, red-eye, silver bream and bream; size-weight characteristics were better in the areas remoted from the Volga delta. In the third decade of July the quantitative indicators of fry fish on these areas decreased, size-weight characteristics greatly increased. In the second decade of October in the western part of the seaside there were registered increased pre-wintering concentrations of fish juveniles, their qualitative indicators increased, which is evidence to favorable feeding conditions in 2012.

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Some specific features of hydrogeochemical control of the shelf deposits development in the Caspian sea

Oilfield Engineering ◽

10.30713/0207-2351-2018-2-17-21 ◽

2018 ◽

pp. 17-21

Author(s):

I.I. Tverdokhlebov ◽

◽

O.I. Abaimov ◽

Keyword(s):

Caspian Sea ◽

The Caspian Sea

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On the type locality of the steppe ribbon racer, Psammophis lineolatus (Brandt, 1838) (Serpentes: Lamprophiidae)

Proceedings of the Zoological Institute RAS ◽

10.31610/trudyzin/2020.324.2.262 ◽

2020 ◽

Vol 324 (2) ◽

pp. 262-272

Author(s):

I.V. Doronin ◽

T.N. Dujsebayeva ◽

K.M. Akhmedenov ◽

A.G. Bakiev ◽

K.N. Plakhov

Keyword(s):

Caspian Sea ◽

Type Specimen ◽

Type Locality ◽

Eastern Coast ◽

Zoological Museum ◽

Western Coast ◽

The Caspian Sea ◽

Original Species ◽

Academy Of Sciences ◽

Made In

The article specifies the type locality of the Steppe Ribbon Racer. The holotype Coluber (Taphrometopon) lineolatus Brandt, 1838 is stored in the reptile collection of the Zoological Institute of the Russian Academy of Sciences (ZISP No 2042). Literature sources provide different information about the type locality. A mistake has been made in the title of the work with the original species description: the western coast of the sea was indicated instead of the eastern one. The place of capture was indicated as “M. Caspium” (Caspian Sea) on the label and in the reptile inventory book of the Zoological Museum of the Academy of Sciences. The specimen was sent to the museum by G.S. Karelin. The “1842” indicated on the labels and in the inventory book cannot be the year of capture of the type specimen, just as the “1837” indicated by A.M. Nikolsky. In 1837, Karelin was in Saint Petersburg and in 1842 in Siberia. Most likely, 1837 is the year when the collection arrived at the Museum, and 1842 is the year when the information about the specimen was recorded in the inventory book (catalog) of the Zoological Museum of the Academy of Sciences. In our opinion, the holotype was caught in 1932. From Karelin’s travel notes of the expedition to the Caspian Sea in 1832, follows that the snake was recorded in two regions adjacent to the eastern coast of the Caspian Sea – Ungoza Mountain (“Mangyshlak Mountains”) and site of the Western Chink of Ustyurt between Zhamanairakty and Kyzyltas Mountains (inclusive) on the northeast coast of Kaydak Sor (“Misty Mountains”). In our article, Karelin’s route to the northeastern coast of the Caspian Sea in 1832 and photographs of these localities are given. The type locality of Psammophis lineolatus (Brandt, 1838) should be restricted to the Mangystau Region of the Kazakhstan: Ungoza Mountain south of Sarytash Gulf, Mangystau (Mangyshlak) Penninsula (44°26´ N, 51°12´ E).

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