Weddell Sea abyssal sediments a record of Antarctic Bottom Water Flow
Deep circulation in the Weddell Sea is a clockwise gyre, with bottom water formed by mixing along the southern and western margins. Most Antarctic Bottom Water originates here, leaving the Weddell Sea to the east (depths > 4500 m) or to the north (depths < 3500 m). This paper describes two cor...
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1988
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Online Access: | http://nora.nerc.ac.uk/id/eprint/521736/ https://doi.org/10.1016/0025-3227(88)90032-1 |
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ftnerc:oai:nora.nerc.ac.uk:521736 2023-05-15T13:41:42+02:00 Weddell Sea abyssal sediments a record of Antarctic Bottom Water Flow Pudsey, Carol J. Barker, Peter F. Hamilton, Norman 1988-06 http://nora.nerc.ac.uk/id/eprint/521736/ https://doi.org/10.1016/0025-3227(88)90032-1 unknown Elsevier Pudsey, Carol J.; Barker, Peter F.; Hamilton, Norman. 1988 Weddell Sea abyssal sediments a record of Antarctic Bottom Water Flow. Marine Geology, 81 (1-4). 289-314. https://doi.org/10.1016/0025-3227(88)90032-1 <https://doi.org/10.1016/0025-3227(88)90032-1> Publication - Article PeerReviewed 1988 ftnerc https://doi.org/10.1016/0025-3227(88)90032-1 2023-02-04T19:47:31Z Deep circulation in the Weddell Sea is a clockwise gyre, with bottom water formed by mixing along the southern and western margins. Most Antarctic Bottom Water originates here, leaving the Weddell Sea to the east (depths > 4500 m) or to the north (depths < 3500 m). This paper describes two coring transects, with 3.5 kHz data, from the northern Weddell Sea and from Jane Basin just to the north. The recovered sediments are mainly of Brunhes age, without significant hiatuses. Sedimentation rates range from 3.6 to > 16 m/Ma. Sediments from the deep Weddell Basin are hemipelagic muds with ash laminae and (mainly in the centre of the gyre) distal turbidites derived from the southwest. Thin debris flows occur near seamounts. The hemipelagic muds become coarser from the centre to the edge of the gyre. Winnowing by strong bottom currents is localised along the northern margin of the basin. The absence of diatoms from the Weddell Basin sediments may result from dissolution as well as low productivity. Sediments from Jane Basin consist of alternating diatomaceous and barren hemipelagic muds, considered to represent interglacial and glacial conditions respectively. The diatomaceous sediments contain more silt, suggesting that bottom water flow increases during interglacial periods. Article in Journal/Newspaper Antarc* Antarctic Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Weddell Sea Weddell Weddell Basin ENVELOPE(32.019,32.019,-55.568,-55.568) Jane Basin ENVELOPE(-41.909,-41.909,-61.890,-61.890) Marine Geology 81 1-4 289 314 |
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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 |
Deep circulation in the Weddell Sea is a clockwise gyre, with bottom water formed by mixing along the southern and western margins. Most Antarctic Bottom Water originates here, leaving the Weddell Sea to the east (depths > 4500 m) or to the north (depths < 3500 m). This paper describes two coring transects, with 3.5 kHz data, from the northern Weddell Sea and from Jane Basin just to the north. The recovered sediments are mainly of Brunhes age, without significant hiatuses. Sedimentation rates range from 3.6 to > 16 m/Ma. Sediments from the deep Weddell Basin are hemipelagic muds with ash laminae and (mainly in the centre of the gyre) distal turbidites derived from the southwest. Thin debris flows occur near seamounts. The hemipelagic muds become coarser from the centre to the edge of the gyre. Winnowing by strong bottom currents is localised along the northern margin of the basin. The absence of diatoms from the Weddell Basin sediments may result from dissolution as well as low productivity. Sediments from Jane Basin consist of alternating diatomaceous and barren hemipelagic muds, considered to represent interglacial and glacial conditions respectively. The diatomaceous sediments contain more silt, suggesting that bottom water flow increases during interglacial periods. |
format |
Article in Journal/Newspaper |
author |
Pudsey, Carol J. Barker, Peter F. Hamilton, Norman |
spellingShingle |
Pudsey, Carol J. Barker, Peter F. Hamilton, Norman Weddell Sea abyssal sediments a record of Antarctic Bottom Water Flow |
author_facet |
Pudsey, Carol J. Barker, Peter F. Hamilton, Norman |
author_sort |
Pudsey, Carol J. |
title |
Weddell Sea abyssal sediments a record of Antarctic Bottom Water Flow |
title_short |
Weddell Sea abyssal sediments a record of Antarctic Bottom Water Flow |
title_full |
Weddell Sea abyssal sediments a record of Antarctic Bottom Water Flow |
title_fullStr |
Weddell Sea abyssal sediments a record of Antarctic Bottom Water Flow |
title_full_unstemmed |
Weddell Sea abyssal sediments a record of Antarctic Bottom Water Flow |
title_sort |
weddell sea abyssal sediments a record of antarctic bottom water flow |
publisher |
Elsevier |
publishDate |
1988 |
url |
http://nora.nerc.ac.uk/id/eprint/521736/ https://doi.org/10.1016/0025-3227(88)90032-1 |
long_lat |
ENVELOPE(32.019,32.019,-55.568,-55.568) ENVELOPE(-41.909,-41.909,-61.890,-61.890) |
geographic |
Antarctic Weddell Sea Weddell Weddell Basin Jane Basin |
geographic_facet |
Antarctic Weddell Sea Weddell Weddell Basin Jane Basin |
genre |
Antarc* Antarctic Weddell Sea |
genre_facet |
Antarc* Antarctic Weddell Sea |
op_relation |
Pudsey, Carol J.; Barker, Peter F.; Hamilton, Norman. 1988 Weddell Sea abyssal sediments a record of Antarctic Bottom Water Flow. Marine Geology, 81 (1-4). 289-314. https://doi.org/10.1016/0025-3227(88)90032-1 <https://doi.org/10.1016/0025-3227(88)90032-1> |
op_doi |
https://doi.org/10.1016/0025-3227(88)90032-1 |
container_title |
Marine Geology |
container_volume |
81 |
container_issue |
1-4 |
container_start_page |
289 |
op_container_end_page |
314 |
_version_ |
1766154206546231296 |