Stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south George VI Ice Shelf, Antarctic Peninsula
Abstract Results from a detailed profile in a 5.54 m multi-year sea-ice core from the rift area in the southern part of George VI Ice Shelf are presented. Stratigraphy, stable isotopes and Na content are used to investigate the growth processes of the ice cover and to relate them to melting processe...
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Language: | English |
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Cambridge University Press (CUP)
1991
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Online Access: | http://dx.doi.org/10.1017/s0022143000005797 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000005797 |
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crcambridgeupr:10.1017/s0022143000005797 2023-06-11T04:06:30+02:00 Stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south George VI Ice Shelf, Antarctic Peninsula Tison, J.-L. Morris, E. M. Souchez, R. Jouzel, J. 1991 http://dx.doi.org/10.1017/s0022143000005797 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000005797 en eng Cambridge University Press (CUP) Journal of Glaciology volume 37, issue 127, page 357-367 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1991 crcambridgeupr https://doi.org/10.1017/s0022143000005797 2023-05-01T18:21:51Z Abstract Results from a detailed profile in a 5.54 m multi-year sea-ice core from the rift area in the southern part of George VI Ice Shelf are presented. Stratigraphy, stable isotopes and Na content are used to investigate the growth processes of the ice cover and to relate them to melting processes at the bottom of the ice shelf. The thickest multi-year sea ice in the sampling area appears to be second-year sea ice that has survived one melt season. Combined salinity/stable-isotope analyses show large-scale sympathetic fluctuations that can be related to the origin of the parent water. Winter accretion represents half of the core length and mainly consists of frazil ice of normal sea-water origin. However, five major dilution events of sea water, with fresh-water input from the melting base of the ice shelf reaching 20% on two occasions, punctuate this winter accretion. Two of them correspond to platelet-ice production, which is often related to the freezing of ascending supercooled water from the bottom of the ice shelf. Brackish ice occurs between 450 and 530 cm in the core. It is demonstrated that this results from the freezing of brackish water (Jeffries and others, 1989) formed by mixing of normal sea water with melted basal shelf ice, with dilution percentages of maximum 80% fresh water. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf ice core Ice Shelf Journal of Glaciology Sea ice Cambridge University Press (via Crossref) Antarctic Antarctic Peninsula George VI Ice Shelf ENVELOPE(-67.840,-67.840,-71.692,-71.692) Journal of Glaciology 37 127 357 367 |
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Open Polar |
collection |
Cambridge University Press (via Crossref) |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Tison, J.-L. Morris, E. M. Souchez, R. Jouzel, J. Stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south George VI Ice Shelf, Antarctic Peninsula |
topic_facet |
Earth-Surface Processes |
description |
Abstract Results from a detailed profile in a 5.54 m multi-year sea-ice core from the rift area in the southern part of George VI Ice Shelf are presented. Stratigraphy, stable isotopes and Na content are used to investigate the growth processes of the ice cover and to relate them to melting processes at the bottom of the ice shelf. The thickest multi-year sea ice in the sampling area appears to be second-year sea ice that has survived one melt season. Combined salinity/stable-isotope analyses show large-scale sympathetic fluctuations that can be related to the origin of the parent water. Winter accretion represents half of the core length and mainly consists of frazil ice of normal sea-water origin. However, five major dilution events of sea water, with fresh-water input from the melting base of the ice shelf reaching 20% on two occasions, punctuate this winter accretion. Two of them correspond to platelet-ice production, which is often related to the freezing of ascending supercooled water from the bottom of the ice shelf. Brackish ice occurs between 450 and 530 cm in the core. It is demonstrated that this results from the freezing of brackish water (Jeffries and others, 1989) formed by mixing of normal sea water with melted basal shelf ice, with dilution percentages of maximum 80% fresh water. |
format |
Article in Journal/Newspaper |
author |
Tison, J.-L. Morris, E. M. Souchez, R. Jouzel, J. |
author_facet |
Tison, J.-L. Morris, E. M. Souchez, R. Jouzel, J. |
author_sort |
Tison, J.-L. |
title |
Stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south George VI Ice Shelf, Antarctic Peninsula |
title_short |
Stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south George VI Ice Shelf, Antarctic Peninsula |
title_full |
Stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south George VI Ice Shelf, Antarctic Peninsula |
title_fullStr |
Stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south George VI Ice Shelf, Antarctic Peninsula |
title_full_unstemmed |
Stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south George VI Ice Shelf, Antarctic Peninsula |
title_sort |
stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south george vi ice shelf, antarctic peninsula |
publisher |
Cambridge University Press (CUP) |
publishDate |
1991 |
url |
http://dx.doi.org/10.1017/s0022143000005797 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000005797 |
long_lat |
ENVELOPE(-67.840,-67.840,-71.692,-71.692) |
geographic |
Antarctic Antarctic Peninsula George VI Ice Shelf |
geographic_facet |
Antarctic Antarctic Peninsula George VI Ice Shelf |
genre |
Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf ice core Ice Shelf Journal of Glaciology Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf ice core Ice Shelf Journal of Glaciology Sea ice |
op_source |
Journal of Glaciology volume 37, issue 127, page 357-367 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000005797 |
container_title |
Journal of Glaciology |
container_volume |
37 |
container_issue |
127 |
container_start_page |
357 |
op_container_end_page |
367 |
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1768378489039224832 |