Ten-month observation of the bottom current regime across a sediment drift of the Pacific margin of the Antarctic Peninsula
We present two time series of bottom current and temperature collected 8 m above the seabed on either side of a large sediment drift located on the continental rise of the Pacific margin of the Antarctic Peninsula. The mean current speed is comparable (6.2 cm s −1 and 6.1 cm s −1 respectively), but...
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Cambridge University Press (CUP)
1997
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Online Access: | http://dx.doi.org/10.1017/s0954102097000552 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102097000552 |
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crcambridgeupr:10.1017/s0954102097000552 2024-06-23T07:47:40+00:00 Ten-month observation of the bottom current regime across a sediment drift of the Pacific margin of the Antarctic Peninsula Camerlenghi, Angelo Crise, A. Pudsey, C.J. Accerboni, E. Laterza, R. Rebesco, M. 1997 http://dx.doi.org/10.1017/s0954102097000552 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102097000552 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 9, issue 4, page 426-433 ISSN 0954-1020 1365-2079 journal-article 1997 crcambridgeupr https://doi.org/10.1017/s0954102097000552 2024-06-05T04:04:49Z We present two time series of bottom current and temperature collected 8 m above the seabed on either side of a large sediment drift located on the continental rise of the Pacific margin of the Antarctic Peninsula. The mean current speed is comparable (6.2 cm s −1 and 6.1 cm s −1 respectively), but the mean direction differs by about 121°. The direction of mean flow follows the bathymetric contour, and the maximum speed never exceeds 20 cm s −1 (below the typical benthic storm threshold). The potential temperature is remarkably stable (0.11 ± 0.01°C and 0.13 ± 0.02°C at the two sites). The cross-covariance indicates a significant peak at 20.2 days lag, slightly longer than the travel time of 18.7 days calculated between the two stations following the isobaths (98.4 km) and thus providing evidence for the topographic control on bottom water flow. The observed bottom water flow is consistent with deposition of Holocene hemipelagic sediments of the ‘drift maintenance’ stage. Indicators for palaeoceanographic conditions during glacial periods of the ‘drift maintenance’ stage and the older ‘drift growth’ stage are at present too scarce to understand fully how the past oceanographic conditions influenced the evolution of the drifts. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Cambridge University Press Antarctic Antarctic Peninsula Pacific The Antarctic Antarctic Science 9 4 426 433 |
institution |
Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
We present two time series of bottom current and temperature collected 8 m above the seabed on either side of a large sediment drift located on the continental rise of the Pacific margin of the Antarctic Peninsula. The mean current speed is comparable (6.2 cm s −1 and 6.1 cm s −1 respectively), but the mean direction differs by about 121°. The direction of mean flow follows the bathymetric contour, and the maximum speed never exceeds 20 cm s −1 (below the typical benthic storm threshold). The potential temperature is remarkably stable (0.11 ± 0.01°C and 0.13 ± 0.02°C at the two sites). The cross-covariance indicates a significant peak at 20.2 days lag, slightly longer than the travel time of 18.7 days calculated between the two stations following the isobaths (98.4 km) and thus providing evidence for the topographic control on bottom water flow. The observed bottom water flow is consistent with deposition of Holocene hemipelagic sediments of the ‘drift maintenance’ stage. Indicators for palaeoceanographic conditions during glacial periods of the ‘drift maintenance’ stage and the older ‘drift growth’ stage are at present too scarce to understand fully how the past oceanographic conditions influenced the evolution of the drifts. |
format |
Article in Journal/Newspaper |
author |
Camerlenghi, Angelo Crise, A. Pudsey, C.J. Accerboni, E. Laterza, R. Rebesco, M. |
spellingShingle |
Camerlenghi, Angelo Crise, A. Pudsey, C.J. Accerboni, E. Laterza, R. Rebesco, M. Ten-month observation of the bottom current regime across a sediment drift of the Pacific margin of the Antarctic Peninsula |
author_facet |
Camerlenghi, Angelo Crise, A. Pudsey, C.J. Accerboni, E. Laterza, R. Rebesco, M. |
author_sort |
Camerlenghi, Angelo |
title |
Ten-month observation of the bottom current regime across a sediment drift of the Pacific margin of the Antarctic Peninsula |
title_short |
Ten-month observation of the bottom current regime across a sediment drift of the Pacific margin of the Antarctic Peninsula |
title_full |
Ten-month observation of the bottom current regime across a sediment drift of the Pacific margin of the Antarctic Peninsula |
title_fullStr |
Ten-month observation of the bottom current regime across a sediment drift of the Pacific margin of the Antarctic Peninsula |
title_full_unstemmed |
Ten-month observation of the bottom current regime across a sediment drift of the Pacific margin of the Antarctic Peninsula |
title_sort |
ten-month observation of the bottom current regime across a sediment drift of the pacific margin of the antarctic peninsula |
publisher |
Cambridge University Press (CUP) |
publishDate |
1997 |
url |
http://dx.doi.org/10.1017/s0954102097000552 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102097000552 |
geographic |
Antarctic Antarctic Peninsula Pacific The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Pacific The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science |
op_source |
Antarctic Science volume 9, issue 4, page 426-433 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102097000552 |
container_title |
Antarctic Science |
container_volume |
9 |
container_issue |
4 |
container_start_page |
426 |
op_container_end_page |
433 |
_version_ |
1802651805447880704 |