Paleogeography of the Atelian regression in the Caspian Sea (based on drilling data)

Yanina, Т.А.; Bolikhovskaya, N.S.; Сорокин, В.М.; Romanyuk, B. F.; Berdnikova, Alina; Tkach, N.

doi:10.1016/j.quaint.2020.07.023

Cited by 14 publications

(13 citation statements)

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“…The Caspian Sea (CS) is the world's largest inland sea, sited within a vast endorheic catchment area (3.6 Mkm 2 ) that is fed by 130 rivers (Rodionov, 1994). Currently, >80% of inflow contribution is from the Over the Quaternary period, the CS experienced extreme water-level changes ranging from approximately +50 m to −90 m between transgressive and regressive periods, and variations of >3 m during the last century (Arpe & Leroy, 2007;Arslanov et al, 2016;Bezrodnykh et al, 2020;Forte & Cowgill, 2013;Kakroodi et al, 2014Kakroodi et al, , 2015Kislov et al, 2014;Krijgsman et al, 2019;Kroonenberg et al, 2008;Leroy et al, 2020;Naderi-Beni et al, 2013;Yanina et al, 2020;Yanina, 2014). Such large variations in water level have substantial impacts on the change in CS surface area (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Impacts of Variations in Caspian Sea Surface Area on Catchment‐Scale and Large‐Scale Climate

et al. 2021

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The Caspian Sea (CS) is the largest inland lake in the world. Large variations in sea level and surface area occurred in the past and are projected for the future. The potential impacts on regional and large-scale hydroclimate are not well understood. Here, we examine the impact of CS area on climate within its catchment and across the northern hemisphere, for the first time with a fully coupled climate model. The Community Earth System Model (CESM1.2.2) is used to simulate the climate of four scenarios: (a) larger than present CS area, (b) current area, (c) smaller than present area, and (d) no-CS scenario. The results reveal large changes in the regional atmospheric water budget. Evaporation (e) over the sea increases with increasing area, while precipitation (P) increases over the south-west CS with increasing area. P-E over the CS catchment decreases as CS surface area increases, indicating a dominant negative lake-evaporation feedback. A larger CS reduces summer surface air temperatures and increases winter temperatures. The impacts extend eastwards, where summer precipitation is enhanced over central Asia and the north-western Pacific experiences warming with reduced winter sea ice. Our results also indicate weakening of the 500-hPa troughs over the northern Pacific with larger CS area. We find a thermal response triggers a southward shift of the upper troposphere jet stream during summer. Our findings establish that changing CS area results in climate impacts of such scope that CS area variations should be incorporated into climate model simulations, including palaeo and future scenarios. Plain Language SummaryThe Caspian Sea is the largest land-locked water body in the world. It is filled by rivers draining a vast region from northern Russia to Iran. The size of the Caspian Sea has varied considerably over recent centuries and millennia due to various factors, including changes in climate. Conversely, as the area of the sea changes it also has impacts on the climate, but there are significant questions about how and where those impacts would be felt. In this study we used a stateof-the-art climate model in which we specified different sizes of Caspian Sea in order to examine how the climate changes as its area increases. We observed that the local seasonal cycle of temperatures gets smaller, and evaporation increases, while there are more spatially complex changes in local rainfall. Furthermore, the impacts on atmospheric circulation occur as far as the north Pacific, with resulting increases in temperature and decreases in sea-ice coverage in winter as the Caspian area increases. The climate impacts are so significant and geographically extensive that climate models used to simulate climate change (both in future and past scenarios) should incorporate changes to the Caspian Sea area if they are to robustly model regional climate. KORICHE ET AL.

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Section: Introductionmentioning

confidence: 99%

Impacts of Variations in Caspian Sea Surface Area on Catchment‐Scale and Large‐Scale Climate

et al. 2021

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“…The Atelian lowstand that is considered as separating the Late Khazarian highstand from the Early Khvalynian one is known from the Northern Peri-Caspian, Azerbaijan, Dagestan, eastern Caspian coast and from the Northern Caspian Sea basin (e.g. Varushchenko et al, 1987;Svitoch and Makshaev, 2020;Yanina et al, 2020 and references therein) (Fig. 1b).…”

Section: Atelian Lowstand and Hyrcanian Highstandmentioning

confidence: 99%

“…(Lokhin and Maev, 1990), and the related ages range between ca 80 and 19 kyr in the Northern Peri-Caspian while in the Northern Caspian Sea basin, they are all centered on ca 40 cal kyr BP (e.g. Varushchenko et al, 1987;Sorokin et al, 2018;Kurbanov et al, 2020;Yanina et al, 2020). This lowstand separates the Early Khvalynian highstand from the previous Late Khazarian highstand that took place probably between 130 and 76 kyr (e.g.…”

Section: Introductionmentioning

confidence: 98%

“…Nevertheless, transgressive Hyrcanian deposits (named also Girkanian) are known from the Northern Peri-Caspian and Manych areas (Fig. 1b) below the Atelian lowstand, and they were recently identified in seismic-acoustic profiles and sediment cores from the Northern Caspian Sea basin (Sorokin et al, 2018;Yanina et al, 2020). The age and stratigraphic position of this highstand are not well defined.…”

Section: Introductionmentioning

confidence: 99%

“…The age and stratigraphic position of this highstand are not well defined. Its age is estimated to be ca 120-90 kyr (Zubakov 1992;Kurbanov et al, 2018), ca 80 kyr (Sorokin et al, 2018;Yanina et al, 2018Yanina et al, , 2020 or even ca 43 cal kyr BP (Lavrushin et al, 2014) and stratigraphically it is not clear whether it constitutes an independent transgression, a part of the Late Khazarian or a part of the Early Khvalynian transgression. Major hydrological periods have been recognized for a long time especially in Russian literature; nevertheless, the associated sedimentary sequences are often incomplete or missing as it was highlighted by Svitoch and Makshaev (2020), and consequently their stratotypes are not established yet.…”

Section: Introductionmentioning

confidence: 99%

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Paleogeography of the Atelian regression in the Caspian Sea (based on drilling data)

Cited by 14 publications

References 29 publications

Impacts of Variations in Caspian Sea Surface Area on Catchment‐Scale and Large‐Scale Climate

Impacts of Variations in Caspian Sea Surface Area on Catchment‐Scale and Large‐Scale Climate

Chronology of the Late Pleistocene Caspian Sea hydrologic changes: A review of dates and proposed climate-induced driving mechanisms

Late Quaternary evolution of lower reaches of the Volga River (Raygorod section) based on luminescence dating

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