Stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south George VI Ice Shelf, Antarctic Peninsula
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...
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International Glaciological Society
1991
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Online Access: | http://nora.nerc.ac.uk/id/eprint/520218/ https://doi.org/10.3189/S0022143000005797 |
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ftnerc:oai:nora.nerc.ac.uk:520218 2023-05-15T13:49:35+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://nora.nerc.ac.uk/id/eprint/520218/ https://doi.org/10.3189/S0022143000005797 unknown International Glaciological Society Tison, J.-L.; Morris, E.M.; Souchez, R.; Jouzel, J. 1991 Stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south George VI Ice Shelf, Antarctic Peninsula. Journal of Glaciology, 37 (127). 357-367. https://doi.org/10.3189/S0022143000005797 <https://doi.org/10.3189/S0022143000005797> Publication - Article PeerReviewed 1991 ftnerc https://doi.org/10.3189/S0022143000005797 2023-02-04T19:46:39Z 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 Natural Environment Research Council: NERC Open Research Archive 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 |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
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. |
spellingShingle |
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 |
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 |
International Glaciological Society |
publishDate |
1991 |
url |
http://nora.nerc.ac.uk/id/eprint/520218/ https://doi.org/10.3189/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_relation |
Tison, J.-L.; Morris, E.M.; Souchez, R.; Jouzel, J. 1991 Stratigraphy, stable isotopes and salinity in multi-year sea ice from the rift area, south George VI Ice Shelf, Antarctic Peninsula. Journal of Glaciology, 37 (127). 357-367. https://doi.org/10.3189/S0022143000005797 <https://doi.org/10.3189/S0022143000005797> |
op_doi |
https://doi.org/10.3189/S0022143000005797 |
container_title |
Journal of Glaciology |
container_volume |
37 |
container_issue |
127 |
container_start_page |
357 |
op_container_end_page |
367 |
_version_ |
1766251781393743872 |