A seasonal cycle in the export of bottom water from the Weddell Sea
Dense water formed over the Antarctic continental shelf rapidly descends into the deep ocean where it spreads throughout the global ocean as Antarctic Bottom Water1, 2. The coldest and most voluminous component of this water mass is Weddell Sea bottom water1, 3, 4, 5, 6, 7. Here we present observati...
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ftoceanrep:oai:oceanrep.geomar.de:8753 2023-05-15T14:12:57+02:00 A seasonal cycle in the export of bottom water from the Weddell Sea Gordon, Arnold L. Huber, Bruce McKee, Darren Visbeck, Martin 2010 text https://oceanrep.geomar.de/id/eprint/8753/ https://oceanrep.geomar.de/id/eprint/8753/1/Visbeck.pdf https://oceanrep.geomar.de/id/eprint/8753/2/ngeo916.pdf https://doi.org/10.1038/ngeo916 en eng Nature Publishing Group https://oceanrep.geomar.de/id/eprint/8753/1/Visbeck.pdf https://oceanrep.geomar.de/id/eprint/8753/2/ngeo916.pdf Gordon, A. L., Huber, B., McKee, D. and Visbeck, M. (2010) A seasonal cycle in the export of bottom water from the Weddell Sea. Nature Geoscience, 3 (8). pp. 551-556. DOI 10.1038/ngeo916 <https://doi.org/10.1038/ngeo916>. doi:10.1038/ngeo916 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2010 ftoceanrep https://doi.org/10.1038/ngeo916 2023-04-07T14:57:00Z Dense water formed over the Antarctic continental shelf rapidly descends into the deep ocean where it spreads throughout the global ocean as Antarctic Bottom Water1, 2. The coldest and most voluminous component of this water mass is Weddell Sea bottom water1, 3, 4, 5, 6, 7. Here we present observations over eight years of the temperature and salinity stratification in the lowermost ocean southeast of the South Orkney Islands, marking the export of Weddell Sea bottom water. We observe a pronounced seasonal cycle in bottom temperatures, with a cold pulse in May/June and a warm one in October/November, but the timing of these phases varies each year. We detect the coldest bottom water in 1999 and 2002, whereas there was no cold phase in 2000. On the basis of current velocities and water mass characteristics, we infer that the pulses originate from the southwest Weddell Sea. We propose that the seasonal fluctuations of Weddell Sea bottom-water properties are governed by the seasonal cycle of the winds over the western margin of the Weddell Sea. Interannual fluctuations are linked to the variability of the wind-driven Weddell Sea gyre and hence to large-scale climate phenomena such as the Southern Annular Mode and El Niño/Southern Oscillation. Article in Journal/Newspaper Antarc* Antarctic South Orkney Islands Weddell Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) The Antarctic Weddell Weddell Sea Nature Geoscience 3 8 551 556 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Dense water formed over the Antarctic continental shelf rapidly descends into the deep ocean where it spreads throughout the global ocean as Antarctic Bottom Water1, 2. The coldest and most voluminous component of this water mass is Weddell Sea bottom water1, 3, 4, 5, 6, 7. Here we present observations over eight years of the temperature and salinity stratification in the lowermost ocean southeast of the South Orkney Islands, marking the export of Weddell Sea bottom water. We observe a pronounced seasonal cycle in bottom temperatures, with a cold pulse in May/June and a warm one in October/November, but the timing of these phases varies each year. We detect the coldest bottom water in 1999 and 2002, whereas there was no cold phase in 2000. On the basis of current velocities and water mass characteristics, we infer that the pulses originate from the southwest Weddell Sea. We propose that the seasonal fluctuations of Weddell Sea bottom-water properties are governed by the seasonal cycle of the winds over the western margin of the Weddell Sea. Interannual fluctuations are linked to the variability of the wind-driven Weddell Sea gyre and hence to large-scale climate phenomena such as the Southern Annular Mode and El Niño/Southern Oscillation. |
format |
Article in Journal/Newspaper |
author |
Gordon, Arnold L. Huber, Bruce McKee, Darren Visbeck, Martin |
spellingShingle |
Gordon, Arnold L. Huber, Bruce McKee, Darren Visbeck, Martin A seasonal cycle in the export of bottom water from the Weddell Sea |
author_facet |
Gordon, Arnold L. Huber, Bruce McKee, Darren Visbeck, Martin |
author_sort |
Gordon, Arnold L. |
title |
A seasonal cycle in the export of bottom water from the Weddell Sea |
title_short |
A seasonal cycle in the export of bottom water from the Weddell Sea |
title_full |
A seasonal cycle in the export of bottom water from the Weddell Sea |
title_fullStr |
A seasonal cycle in the export of bottom water from the Weddell Sea |
title_full_unstemmed |
A seasonal cycle in the export of bottom water from the Weddell Sea |
title_sort |
seasonal cycle in the export of bottom water from the weddell sea |
publisher |
Nature Publishing Group |
publishDate |
2010 |
url |
https://oceanrep.geomar.de/id/eprint/8753/ https://oceanrep.geomar.de/id/eprint/8753/1/Visbeck.pdf https://oceanrep.geomar.de/id/eprint/8753/2/ngeo916.pdf https://doi.org/10.1038/ngeo916 |
long_lat |
ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Antarctic South Orkney Islands The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic South Orkney Islands The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic South Orkney Islands Weddell Sea |
genre_facet |
Antarc* Antarctic South Orkney Islands Weddell Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/8753/1/Visbeck.pdf https://oceanrep.geomar.de/id/eprint/8753/2/ngeo916.pdf Gordon, A. L., Huber, B., McKee, D. and Visbeck, M. (2010) A seasonal cycle in the export of bottom water from the Weddell Sea. Nature Geoscience, 3 (8). pp. 551-556. DOI 10.1038/ngeo916 <https://doi.org/10.1038/ngeo916>. doi:10.1038/ngeo916 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1038/ngeo916 |
container_title |
Nature Geoscience |
container_volume |
3 |
container_issue |
8 |
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551 |
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556 |
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1766285340153217024 |