Hydroclimatic processes as the primary drivers of the Early Khvalynian transgression of the Caspian Sea: new developments
It has been well established that during the late Quaternary, the Khvalynian transgression of the Caspian Sea occurred, when the sea level rose tens of meters above the present level. Here, we evaluate the physical feasibility of the hypothesis that the maximum phase of this extraordinary event (kno...
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Copernicus Publications
2024
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Online Access: | https://doi.org/10.5194/hess-28-241-2024 https://doaj.org/article/cd91b78e82f145d488d60e6da59dc834 |
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ftdoajarticles:oai:doaj.org/article:cd91b78e82f145d488d60e6da59dc834 2024-02-11T10:04:42+01:00 Hydroclimatic processes as the primary drivers of the Early Khvalynian transgression of the Caspian Sea: new developments A. Gelfan A. Panin A. Kalugin P. Morozova V. Semenov A. Sidorchuk V. Ukraintsev K. Ushakov 2024-01-01T00:00:00Z https://doi.org/10.5194/hess-28-241-2024 https://doaj.org/article/cd91b78e82f145d488d60e6da59dc834 EN eng Copernicus Publications https://hess.copernicus.org/articles/28/241/2024/hess-28-241-2024.pdf https://doaj.org/toc/1027-5606 https://doaj.org/toc/1607-7938 doi:10.5194/hess-28-241-2024 1027-5606 1607-7938 https://doaj.org/article/cd91b78e82f145d488d60e6da59dc834 Hydrology and Earth System Sciences, Vol 28, Pp 241-259 (2024) Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2024 ftdoajarticles https://doi.org/10.5194/hess-28-241-2024 2024-01-21T01:40:35Z It has been well established that during the late Quaternary, the Khvalynian transgression of the Caspian Sea occurred, when the sea level rose tens of meters above the present level. Here, we evaluate the physical feasibility of the hypothesis that the maximum phase of this extraordinary event (known as the “Early Khvalynian transgression”) could be initiated and maintained for several thousand years solely by hydroclimatic factors. The hypothesis is based on recent studies dating the highest sea level stage (well above + 10 m a.s.l.) to the final period of deglaciation, 17–13 kyr BP, and studies estimating the contribution of the glacial waters in the sea level rise for this period as negligible. To evaluate the hypothesis put forward, we first applied the coupled ocean and sea-ice general circulation model driven by the climate model and estimated the equilibrium water inflow (irrespective of its origin) sufficient to maintain the sea level at the well-dated marks of the Early Khvalynian transgression as 400–470 km 3 yr −1 . Secondly, we conducted an extensive radiocarbon dating of the large paleochannels (signs of high flow of atmospheric origin) located in the Volga basin and found that the period of their origin (17.5–14 ka BP) is almost identical to the recent dating of the main phase of the Early Khvalynian transgression. Water flow that could form these paleochannels was earlier estimated for the ancient Volga River as 420 km 3 yr −1 , i.e., close to the equilibrium runoff we determined. Thirdly, we applied a hydrological model forced by paleoclimate data to reveal physically consistent mechanisms of an extraordinarily high water inflow into the Caspian Sea in the absence of a visible glacial meltwater effect. We found that the inflow could be caused by the spread of post-glacial permafrost in the Volga paleocatchment. The numerical experiments demonstrated that the permafrost resulted in a sharp drop in infiltration into the frozen ground and reduced evaporation, which all together generated the Volga ... Article in Journal/Newspaper Ice permafrost Sea ice Directory of Open Access Journals: DOAJ Articles Hydrology and Earth System Sciences 28 1 241 259 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
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Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 A. Gelfan A. Panin A. Kalugin P. Morozova V. Semenov A. Sidorchuk V. Ukraintsev K. Ushakov Hydroclimatic processes as the primary drivers of the Early Khvalynian transgression of the Caspian Sea: new developments |
topic_facet |
Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
It has been well established that during the late Quaternary, the Khvalynian transgression of the Caspian Sea occurred, when the sea level rose tens of meters above the present level. Here, we evaluate the physical feasibility of the hypothesis that the maximum phase of this extraordinary event (known as the “Early Khvalynian transgression”) could be initiated and maintained for several thousand years solely by hydroclimatic factors. The hypothesis is based on recent studies dating the highest sea level stage (well above + 10 m a.s.l.) to the final period of deglaciation, 17–13 kyr BP, and studies estimating the contribution of the glacial waters in the sea level rise for this period as negligible. To evaluate the hypothesis put forward, we first applied the coupled ocean and sea-ice general circulation model driven by the climate model and estimated the equilibrium water inflow (irrespective of its origin) sufficient to maintain the sea level at the well-dated marks of the Early Khvalynian transgression as 400–470 km 3 yr −1 . Secondly, we conducted an extensive radiocarbon dating of the large paleochannels (signs of high flow of atmospheric origin) located in the Volga basin and found that the period of their origin (17.5–14 ka BP) is almost identical to the recent dating of the main phase of the Early Khvalynian transgression. Water flow that could form these paleochannels was earlier estimated for the ancient Volga River as 420 km 3 yr −1 , i.e., close to the equilibrium runoff we determined. Thirdly, we applied a hydrological model forced by paleoclimate data to reveal physically consistent mechanisms of an extraordinarily high water inflow into the Caspian Sea in the absence of a visible glacial meltwater effect. We found that the inflow could be caused by the spread of post-glacial permafrost in the Volga paleocatchment. The numerical experiments demonstrated that the permafrost resulted in a sharp drop in infiltration into the frozen ground and reduced evaporation, which all together generated the Volga ... |
format |
Article in Journal/Newspaper |
author |
A. Gelfan A. Panin A. Kalugin P. Morozova V. Semenov A. Sidorchuk V. Ukraintsev K. Ushakov |
author_facet |
A. Gelfan A. Panin A. Kalugin P. Morozova V. Semenov A. Sidorchuk V. Ukraintsev K. Ushakov |
author_sort |
A. Gelfan |
title |
Hydroclimatic processes as the primary drivers of the Early Khvalynian transgression of the Caspian Sea: new developments |
title_short |
Hydroclimatic processes as the primary drivers of the Early Khvalynian transgression of the Caspian Sea: new developments |
title_full |
Hydroclimatic processes as the primary drivers of the Early Khvalynian transgression of the Caspian Sea: new developments |
title_fullStr |
Hydroclimatic processes as the primary drivers of the Early Khvalynian transgression of the Caspian Sea: new developments |
title_full_unstemmed |
Hydroclimatic processes as the primary drivers of the Early Khvalynian transgression of the Caspian Sea: new developments |
title_sort |
hydroclimatic processes as the primary drivers of the early khvalynian transgression of the caspian sea: new developments |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/hess-28-241-2024 https://doaj.org/article/cd91b78e82f145d488d60e6da59dc834 |
genre |
Ice permafrost Sea ice |
genre_facet |
Ice permafrost Sea ice |
op_source |
Hydrology and Earth System Sciences, Vol 28, Pp 241-259 (2024) |
op_relation |
https://hess.copernicus.org/articles/28/241/2024/hess-28-241-2024.pdf https://doaj.org/toc/1027-5606 https://doaj.org/toc/1607-7938 doi:10.5194/hess-28-241-2024 1027-5606 1607-7938 https://doaj.org/article/cd91b78e82f145d488d60e6da59dc834 |
op_doi |
https://doi.org/10.5194/hess-28-241-2024 |
container_title |
Hydrology and Earth System Sciences |
container_volume |
28 |
container_issue |
1 |
container_start_page |
241 |
op_container_end_page |
259 |
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1790601426203836416 |