Oceanographic observations from George VI Ice Shelf, Antarctic Peninsula
Summer profiles of sea-water temperature, salinity and flow were obtained on George VI Ice Shelf near its northern ice front. At each depth, temperature salinity and density show little variation between sites. Their respective variation to 250 m depth confirms a linear temperature-salinity dependen...
Published in: | Annals of Glaciology |
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International Glaciological Society
1982
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Online Access: | http://nora.nerc.ac.uk/id/eprint/524430/ https://doi.org/10.3189/S0260305500002731 |
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ftnerc:oai:nora.nerc.ac.uk:524430 2023-05-15T13:29:22+02:00 Oceanographic observations from George VI Ice Shelf, Antarctic Peninsula Lennon, P. Loynes, J. Paren, J.G. Potter, J.R. 1982 http://nora.nerc.ac.uk/id/eprint/524430/ https://doi.org/10.3189/S0260305500002731 unknown International Glaciological Society Lennon, P.; Loynes, J.; Paren, J.G.; Potter, J.R. 1982 Oceanographic observations from George VI Ice Shelf, Antarctic Peninsula. Annals of Glaciology, 3. 178-183. https://doi.org/10.3189/S0260305500002731 <https://doi.org/10.3189/S0260305500002731> Publication - Article PeerReviewed 1982 ftnerc https://doi.org/10.3189/S0260305500002731 2023-02-04T19:48:50Z Summer profiles of sea-water temperature, salinity and flow were obtained on George VI Ice Shelf near its northern ice front. At each depth, temperature salinity and density show little variation between sites. Their respective variation to 250 m depth confirms a linear temperature-salinity dependence. This is the first place in the world where observations confirm precisely the form of the T-S diagram predicted for fresh ice melting in sea-water. Both tidal and residual flow are small, except at the western margin of the ice front, where a strong outflow is concentrated immediately beneath the ice shelf. The observations lead to a simple circulation model for the ice-shelf regime. Warm Deep Water flows southwards into George VI Sound, replacing the colder water that spreads northwards in the surface outflow. Thermohaline exchanges beneath the ice shelf determine the salinity profile, which itself provides evidence of upwelling. Estimates can be made of the basal melt rate of the ice shelf. The rates vary from around 10 m a−1 at the ice front to an average value for the ice shelf of order 1 m a−1. The average value is consistent with earlier estimates from surveys of ice-shelf strain. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf Natural Environment Research Council: NERC Open Research Archive Antarctic Antarctic Peninsula George VI Ice Shelf ENVELOPE(-67.840,-67.840,-71.692,-71.692) George VI Sound ENVELOPE(-68.000,-68.000,-71.000,-71.000) Annals of Glaciology 3 178 183 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
Summer profiles of sea-water temperature, salinity and flow were obtained on George VI Ice Shelf near its northern ice front. At each depth, temperature salinity and density show little variation between sites. Their respective variation to 250 m depth confirms a linear temperature-salinity dependence. This is the first place in the world where observations confirm precisely the form of the T-S diagram predicted for fresh ice melting in sea-water. Both tidal and residual flow are small, except at the western margin of the ice front, where a strong outflow is concentrated immediately beneath the ice shelf. The observations lead to a simple circulation model for the ice-shelf regime. Warm Deep Water flows southwards into George VI Sound, replacing the colder water that spreads northwards in the surface outflow. Thermohaline exchanges beneath the ice shelf determine the salinity profile, which itself provides evidence of upwelling. Estimates can be made of the basal melt rate of the ice shelf. The rates vary from around 10 m a−1 at the ice front to an average value for the ice shelf of order 1 m a−1. The average value is consistent with earlier estimates from surveys of ice-shelf strain. |
format |
Article in Journal/Newspaper |
author |
Lennon, P. Loynes, J. Paren, J.G. Potter, J.R. |
spellingShingle |
Lennon, P. Loynes, J. Paren, J.G. Potter, J.R. Oceanographic observations from George VI Ice Shelf, Antarctic Peninsula |
author_facet |
Lennon, P. Loynes, J. Paren, J.G. Potter, J.R. |
author_sort |
Lennon, P. |
title |
Oceanographic observations from George VI Ice Shelf, Antarctic Peninsula |
title_short |
Oceanographic observations from George VI Ice Shelf, Antarctic Peninsula |
title_full |
Oceanographic observations from George VI Ice Shelf, Antarctic Peninsula |
title_fullStr |
Oceanographic observations from George VI Ice Shelf, Antarctic Peninsula |
title_full_unstemmed |
Oceanographic observations from George VI Ice Shelf, Antarctic Peninsula |
title_sort |
oceanographic observations from george vi ice shelf, antarctic peninsula |
publisher |
International Glaciological Society |
publishDate |
1982 |
url |
http://nora.nerc.ac.uk/id/eprint/524430/ https://doi.org/10.3189/S0260305500002731 |
long_lat |
ENVELOPE(-67.840,-67.840,-71.692,-71.692) ENVELOPE(-68.000,-68.000,-71.000,-71.000) |
geographic |
Antarctic Antarctic Peninsula George VI Ice Shelf George VI Sound |
geographic_facet |
Antarctic Antarctic Peninsula George VI Ice Shelf George VI Sound |
genre |
Annals of Glaciology Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf |
genre_facet |
Annals of Glaciology Antarc* Antarctic Antarctic Peninsula George VI Ice Shelf Ice Shelf |
op_relation |
Lennon, P.; Loynes, J.; Paren, J.G.; Potter, J.R. 1982 Oceanographic observations from George VI Ice Shelf, Antarctic Peninsula. Annals of Glaciology, 3. 178-183. https://doi.org/10.3189/S0260305500002731 <https://doi.org/10.3189/S0260305500002731> |
op_doi |
https://doi.org/10.3189/S0260305500002731 |
container_title |
Annals of Glaciology |
container_volume |
3 |
container_start_page |
178 |
op_container_end_page |
183 |
_version_ |
1766000209179967488 |