Ice-shelf ? ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements
International audience Melt water from the floating ice shelves at the margins of the southeastern Weddell Sea makes a significant contribution to the fresh water budget of the region. In February 2005 a multi-institution team conducted an oceanographic campaign at Fimbul Ice Shelf on the Greenwich...
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ftinsu:oai:HAL:hal-00298484v1 2023-11-12T04:04:52+01:00 Ice-shelf ? ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements Price, M. R. Heywood, K. J. Nicholls, K. W. School of Environmental Sciences Norwich University of East Anglia Norwich (UEA) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) 2007-09-18 https://hal.science/hal-00298484 https://hal.science/hal-00298484/document https://hal.science/hal-00298484/file/osd-4-709-2007.pdf en eng HAL CCSD European Geosciences Union hal-00298484 https://hal.science/hal-00298484 https://hal.science/hal-00298484/document https://hal.science/hal-00298484/file/osd-4-709-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1812-0806 EISSN: 1812-0822 Ocean Science Discussions https://hal.science/hal-00298484 Ocean Science Discussions, 2007, 4 (5), pp.709-732 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2007 ftinsu 2023-10-25T16:28:01Z International audience Melt water from the floating ice shelves at the margins of the southeastern Weddell Sea makes a significant contribution to the fresh water budget of the region. In February 2005 a multi-institution team conducted an oceanographic campaign at Fimbul Ice Shelf on the Greenwich Meridian as part of the Autosub Under Ice programme. This included a mission of the autonomous submarine Autosub 25 km into the cavity beneath Fimbul Ice Shelf, and a number of ship-based hydrographic sections on the continental shelf and adjacent to the ice shelf front. The measurements reveal two significant sources of glacial melt water at Fimbul Ice Shelf: the main cavity under the ice shelf and an ice tongue that protrudes from the main ice front and out over the continental slope into deep water. Glacial melt water is concentrated in a 200 m thick Ice Shelf Water (ISW) layer below the base of the ice shelf at 150?200 m, with a maximum glacial melt concentration of up to 1.16%. Some glacial melt is found throughout the water column, and much of this is from sources other than Fimbul Ice Shelf. However, at least 0.2% of the water in the ISW layer cannot be accounted for by other processes and must have been contributed by the ice shelf. Just downstream of Fimbul Ice Shelf we observe locally created ISW mixing out across the continental slope. The ISW formed here is much less dense than that formed in the southwest Weddell Sea, and will ultimately contribute a freshening (and reduction in ? 18 O) to the upper 100?150 m of the water column in the southeast Weddell Sea. Article in Journal/Newspaper Antarc* Antarctica Fimbul Ice Shelf Ice Shelf Ice Shelves Weddell Sea Institut national des sciences de l'Univers: HAL-INSU Weddell Sea Weddell Greenwich Fimbul Ice Shelf ENVELOPE(-0.500,-0.500,-70.750,-70.750) |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Price, M. R. Heywood, K. J. Nicholls, K. W. Ice-shelf ? ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Melt water from the floating ice shelves at the margins of the southeastern Weddell Sea makes a significant contribution to the fresh water budget of the region. In February 2005 a multi-institution team conducted an oceanographic campaign at Fimbul Ice Shelf on the Greenwich Meridian as part of the Autosub Under Ice programme. This included a mission of the autonomous submarine Autosub 25 km into the cavity beneath Fimbul Ice Shelf, and a number of ship-based hydrographic sections on the continental shelf and adjacent to the ice shelf front. The measurements reveal two significant sources of glacial melt water at Fimbul Ice Shelf: the main cavity under the ice shelf and an ice tongue that protrudes from the main ice front and out over the continental slope into deep water. Glacial melt water is concentrated in a 200 m thick Ice Shelf Water (ISW) layer below the base of the ice shelf at 150?200 m, with a maximum glacial melt concentration of up to 1.16%. Some glacial melt is found throughout the water column, and much of this is from sources other than Fimbul Ice Shelf. However, at least 0.2% of the water in the ISW layer cannot be accounted for by other processes and must have been contributed by the ice shelf. Just downstream of Fimbul Ice Shelf we observe locally created ISW mixing out across the continental slope. The ISW formed here is much less dense than that formed in the southwest Weddell Sea, and will ultimately contribute a freshening (and reduction in ? 18 O) to the upper 100?150 m of the water column in the southeast Weddell Sea. |
author2 |
School of Environmental Sciences Norwich University of East Anglia Norwich (UEA) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) |
format |
Article in Journal/Newspaper |
author |
Price, M. R. Heywood, K. J. Nicholls, K. W. |
author_facet |
Price, M. R. Heywood, K. J. Nicholls, K. W. |
author_sort |
Price, M. R. |
title |
Ice-shelf ? ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements |
title_short |
Ice-shelf ? ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements |
title_full |
Ice-shelf ? ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements |
title_fullStr |
Ice-shelf ? ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements |
title_full_unstemmed |
Ice-shelf ? ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements |
title_sort |
ice-shelf ? ocean interactions at fimbul ice shelf, antarctica from oxygen isotope ratio measurements |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00298484 https://hal.science/hal-00298484/document https://hal.science/hal-00298484/file/osd-4-709-2007.pdf |
long_lat |
ENVELOPE(-0.500,-0.500,-70.750,-70.750) |
geographic |
Weddell Sea Weddell Greenwich Fimbul Ice Shelf |
geographic_facet |
Weddell Sea Weddell Greenwich Fimbul Ice Shelf |
genre |
Antarc* Antarctica Fimbul Ice Shelf Ice Shelf Ice Shelves Weddell Sea |
genre_facet |
Antarc* Antarctica Fimbul Ice Shelf Ice Shelf Ice Shelves Weddell Sea |
op_source |
ISSN: 1812-0806 EISSN: 1812-0822 Ocean Science Discussions https://hal.science/hal-00298484 Ocean Science Discussions, 2007, 4 (5), pp.709-732 |
op_relation |
hal-00298484 https://hal.science/hal-00298484 https://hal.science/hal-00298484/document https://hal.science/hal-00298484/file/osd-4-709-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782341797230411776 |