Physical oceanography studies in the Weddell Sea during the Norwegian Antarctic Research Expedition 1978/79
Hydrographic and current measurements obtained during the Norwegian Antarctic Research Expedition 1978/79 to the southern Weddell Sea are presented. Cold, dense Ice Shelf Water circulating under the floating ice shelves is observed to leave the shelf as a concentrated bottom flow. From moored curren...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Norwegian Polar Institute
1985
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Online Access: | https://polarresearch.net/index.php/polar/article/view/2525 https://doi.org/10.3402/polar.v3i2.6952 |
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ftjpolarres:oai:journals.openacademia.net:article/2525 2023-05-15T14:01:21+02:00 Physical oceanography studies in the Weddell Sea during the Norwegian Antarctic Research Expedition 1978/79 Foldvik, Arne Gammelsrød, Tor Tørresen, Tor 1985-01-12 application/pdf https://polarresearch.net/index.php/polar/article/view/2525 https://doi.org/10.3402/polar.v3i2.6952 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2525/5776 https://polarresearch.net/index.php/polar/article/view/2525 doi:10.3402/polar.v3i2.6952 Copyright (c) 2018 Polar Research Polar Research; Vol. 3 No. 2 (1985); 195-207 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1985 ftjpolarres https://doi.org/10.3402/polar.v3i2.6952 2021-11-11T19:12:57Z Hydrographic and current measurements obtained during the Norwegian Antarctic Research Expedition 1978/79 to the southern Weddell Sea are presented. Cold, dense Ice Shelf Water circulating under the floating ice shelves is observed to leave the shelf as a concentrated bottom flow. From moored current metres this discharge is estimated at 0.7. lo6 m3/s at -2.o"C (one year average) and with no appreciable seasonal variation. This contribution to the Weddell Sea Bottom Water is clearly identified through extreme temperature gradients at our deepest stations (below 2500 m). The core of Weddell Deep Water shows a considerable (T ~ 0.5"C) warming up since 1977, presumably due to the lack of polynya activity in the intervening period. Measurements in the coastal current at the ice shelf (70%. 2"W) show step structures which are probably due to cooling and melting at the vertical ice barrier. Slight supercooling due to circulation under the ice shelf is also seen. The net effect of the ice shelf boundary seems to be a deep reaching cooling and freshening of the coastal current providing the low salinity. freezing point Eastern Shelf Water. This process is considered a preconditioning which enhances production of the saline Western Shelf Water which in turn is transformed to Ice Shelf Water. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Ice Shelves Polar Research Weddell Sea Polar Research (E-Journal) Antarctic Weddell Sea Weddell Western Shelf ENVELOPE(164.448,164.448,-77.780,-77.780) Polar Research 3 2 195 207 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
Hydrographic and current measurements obtained during the Norwegian Antarctic Research Expedition 1978/79 to the southern Weddell Sea are presented. Cold, dense Ice Shelf Water circulating under the floating ice shelves is observed to leave the shelf as a concentrated bottom flow. From moored current metres this discharge is estimated at 0.7. lo6 m3/s at -2.o"C (one year average) and with no appreciable seasonal variation. This contribution to the Weddell Sea Bottom Water is clearly identified through extreme temperature gradients at our deepest stations (below 2500 m). The core of Weddell Deep Water shows a considerable (T ~ 0.5"C) warming up since 1977, presumably due to the lack of polynya activity in the intervening period. Measurements in the coastal current at the ice shelf (70%. 2"W) show step structures which are probably due to cooling and melting at the vertical ice barrier. Slight supercooling due to circulation under the ice shelf is also seen. The net effect of the ice shelf boundary seems to be a deep reaching cooling and freshening of the coastal current providing the low salinity. freezing point Eastern Shelf Water. This process is considered a preconditioning which enhances production of the saline Western Shelf Water which in turn is transformed to Ice Shelf Water. |
format |
Article in Journal/Newspaper |
author |
Foldvik, Arne Gammelsrød, Tor Tørresen, Tor |
spellingShingle |
Foldvik, Arne Gammelsrød, Tor Tørresen, Tor Physical oceanography studies in the Weddell Sea during the Norwegian Antarctic Research Expedition 1978/79 |
author_facet |
Foldvik, Arne Gammelsrød, Tor Tørresen, Tor |
author_sort |
Foldvik, Arne |
title |
Physical oceanography studies in the Weddell Sea during the Norwegian Antarctic Research Expedition 1978/79 |
title_short |
Physical oceanography studies in the Weddell Sea during the Norwegian Antarctic Research Expedition 1978/79 |
title_full |
Physical oceanography studies in the Weddell Sea during the Norwegian Antarctic Research Expedition 1978/79 |
title_fullStr |
Physical oceanography studies in the Weddell Sea during the Norwegian Antarctic Research Expedition 1978/79 |
title_full_unstemmed |
Physical oceanography studies in the Weddell Sea during the Norwegian Antarctic Research Expedition 1978/79 |
title_sort |
physical oceanography studies in the weddell sea during the norwegian antarctic research expedition 1978/79 |
publisher |
Norwegian Polar Institute |
publishDate |
1985 |
url |
https://polarresearch.net/index.php/polar/article/view/2525 https://doi.org/10.3402/polar.v3i2.6952 |
long_lat |
ENVELOPE(164.448,164.448,-77.780,-77.780) |
geographic |
Antarctic Weddell Sea Weddell Western Shelf |
geographic_facet |
Antarctic Weddell Sea Weddell Western Shelf |
genre |
Antarc* Antarctic Ice Shelf Ice Shelves Polar Research Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Shelf Ice Shelves Polar Research Weddell Sea |
op_source |
Polar Research; Vol. 3 No. 2 (1985); 195-207 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2525/5776 https://polarresearch.net/index.php/polar/article/view/2525 doi:10.3402/polar.v3i2.6952 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v3i2.6952 |
container_title |
Polar Research |
container_volume |
3 |
container_issue |
2 |
container_start_page |
195 |
op_container_end_page |
207 |
_version_ |
1766271085690486784 |