REGULARITIES OF CONGELATION ICE DEVELOPMENT IN SUBGLACIAL LAKE VOSTOK
Petrographic studies performed on the continuous basis along the two ice cores obtained from holes 5G-1 and 5G-2 at Vostok Station has allowed to characterize with great details the evolution of the ice texture and fabric in the 232-m thick stratum of accreted ice formed from theLakeVostokwater. Con...
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ftdoajarticles:oai:doaj.org/article:3f269afb0cb342ecac1ff7aaaa17545c 2023-05-15T18:46:13+02:00 REGULARITIES OF CONGELATION ICE DEVELOPMENT IN SUBGLACIAL LAKE VOSTOK V. Ya. Lipenkov E. V. Polyakova A. A. Ekaykin 2015-11-01T00:00:00Z https://doi.org/10.15356/2076-6734-2012-4-65-77 https://doaj.org/article/3f269afb0cb342ecac1ff7aaaa17545c RU rus Nauka https://ice-snow.igras.ru/jour/article/view/208 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.15356/2076-6734-2012-4-65-77 https://doaj.org/article/3f269afb0cb342ecac1ff7aaaa17545c Лëд и снег, Vol 52, Iss 4, Pp 65-77 (2015) антарктида ледниковый покров ледяной керн ортотропный рост подледниковое озеро структура льда упорядоченное строение Science Q article 2015 ftdoajarticles https://doi.org/10.15356/2076-6734-2012-4-65-77 2023-03-19T01:40:13Z Petrographic studies performed on the continuous basis along the two ice cores obtained from holes 5G-1 and 5G-2 at Vostok Station has allowed to characterize with great details the evolution of the ice texture and fabric in the 232-m thick stratum of accreted ice formed from theLakeVostokwater. Conventionally the whole thickness of accreted ice is divided into two strata: lake ice 1 and lake ice 2. Lake ice 1 (3537–3618 m), formed in the sallow strait50 kmupstream of Vostok, is characterized by presence of disseminated mineral inclusions of Lake Vostok sediments, as well as of «water pockets» that represent frozen water inclusions trapped during the ice accretion. The latter constitute less than 1% of the total ice volume, their mean size is about0.5 cm. Gases trapped by «water pockets» during ice formation transform into crystalline inclusions of mixed gas hydrates. Accretion of lake ice 2 (3618–3769 m) proceeds in the deep part of the lake at a very small rate that does not assume trapping of liquid water inclusions and gases.Both strata of accreted ice are formed by orthotropic crystal growth from pure water. The main tendency in the evolution of accreted ice texture is growth of the mean crystal size with depth as the lake ice becomes younger towards the ice-water interface. The high-amplitude variations of crystal size and orientation observed around this general trend are shown to be linked with temporal and spatial variability of the supercooled melt-water flux from the northern part of the lake towards the ice formation site. The presence of supercooled water at the crystallization front supports persistent preferable growth of ice crystals with sub-horizontally oriented c-axes. The lack of supercooled water in turn support persistent growth of ice crystals with vertical or inclined with respect to the crystallization front c-axis orientation. It means that each of these preferred fabric orientations could serve as an indicator of intensity of melt water flux towards the ice formation site. After ... Article in Journal/Newspaper Антарктида Directory of Open Access Journals: DOAJ Articles Lake Vostok ENVELOPE(106.000,106.000,-77.500,-77.500) Vostok Station ENVELOPE(106.837,106.837,-78.464,-78.464) Ice and Snow 52 4 65 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
антарктида ледниковый покров ледяной керн ортотропный рост подледниковое озеро структура льда упорядоченное строение Science Q |
spellingShingle |
антарктида ледниковый покров ледяной керн ортотропный рост подледниковое озеро структура льда упорядоченное строение Science Q V. Ya. Lipenkov E. V. Polyakova A. A. Ekaykin REGULARITIES OF CONGELATION ICE DEVELOPMENT IN SUBGLACIAL LAKE VOSTOK |
topic_facet |
антарктида ледниковый покров ледяной керн ортотропный рост подледниковое озеро структура льда упорядоченное строение Science Q |
description |
Petrographic studies performed on the continuous basis along the two ice cores obtained from holes 5G-1 and 5G-2 at Vostok Station has allowed to characterize with great details the evolution of the ice texture and fabric in the 232-m thick stratum of accreted ice formed from theLakeVostokwater. Conventionally the whole thickness of accreted ice is divided into two strata: lake ice 1 and lake ice 2. Lake ice 1 (3537–3618 m), formed in the sallow strait50 kmupstream of Vostok, is characterized by presence of disseminated mineral inclusions of Lake Vostok sediments, as well as of «water pockets» that represent frozen water inclusions trapped during the ice accretion. The latter constitute less than 1% of the total ice volume, their mean size is about0.5 cm. Gases trapped by «water pockets» during ice formation transform into crystalline inclusions of mixed gas hydrates. Accretion of lake ice 2 (3618–3769 m) proceeds in the deep part of the lake at a very small rate that does not assume trapping of liquid water inclusions and gases.Both strata of accreted ice are formed by orthotropic crystal growth from pure water. The main tendency in the evolution of accreted ice texture is growth of the mean crystal size with depth as the lake ice becomes younger towards the ice-water interface. The high-amplitude variations of crystal size and orientation observed around this general trend are shown to be linked with temporal and spatial variability of the supercooled melt-water flux from the northern part of the lake towards the ice formation site. The presence of supercooled water at the crystallization front supports persistent preferable growth of ice crystals with sub-horizontally oriented c-axes. The lack of supercooled water in turn support persistent growth of ice crystals with vertical or inclined with respect to the crystallization front c-axis orientation. It means that each of these preferred fabric orientations could serve as an indicator of intensity of melt water flux towards the ice formation site. After ... |
format |
Article in Journal/Newspaper |
author |
V. Ya. Lipenkov E. V. Polyakova A. A. Ekaykin |
author_facet |
V. Ya. Lipenkov E. V. Polyakova A. A. Ekaykin |
author_sort |
V. Ya. Lipenkov |
title |
REGULARITIES OF CONGELATION ICE DEVELOPMENT IN SUBGLACIAL LAKE VOSTOK |
title_short |
REGULARITIES OF CONGELATION ICE DEVELOPMENT IN SUBGLACIAL LAKE VOSTOK |
title_full |
REGULARITIES OF CONGELATION ICE DEVELOPMENT IN SUBGLACIAL LAKE VOSTOK |
title_fullStr |
REGULARITIES OF CONGELATION ICE DEVELOPMENT IN SUBGLACIAL LAKE VOSTOK |
title_full_unstemmed |
REGULARITIES OF CONGELATION ICE DEVELOPMENT IN SUBGLACIAL LAKE VOSTOK |
title_sort |
regularities of congelation ice development in subglacial lake vostok |
publisher |
Nauka |
publishDate |
2015 |
url |
https://doi.org/10.15356/2076-6734-2012-4-65-77 https://doaj.org/article/3f269afb0cb342ecac1ff7aaaa17545c |
long_lat |
ENVELOPE(106.000,106.000,-77.500,-77.500) ENVELOPE(106.837,106.837,-78.464,-78.464) |
geographic |
Lake Vostok Vostok Station |
geographic_facet |
Lake Vostok Vostok Station |
genre |
Антарктида |
genre_facet |
Антарктида |
op_source |
Лëд и снег, Vol 52, Iss 4, Pp 65-77 (2015) |
op_relation |
https://ice-snow.igras.ru/jour/article/view/208 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.15356/2076-6734-2012-4-65-77 https://doaj.org/article/3f269afb0cb342ecac1ff7aaaa17545c |
op_doi |
https://doi.org/10.15356/2076-6734-2012-4-65-77 |
container_title |
Ice and Snow |
container_volume |
52 |
container_issue |
4 |
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65 |
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1766237673883697152 |