Paleogeographic controls on the onset of the Antarctic circumpolar current
Development of the Antarctic Circumpolar Current (ACC) during the Cenozoic is controversial in terms of timing and its role in major climate transitions. Some propose that the development of the ACC was instrumental in the continental scale glaciation of Antarctica and climate cooling at the Eocene/...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:1415294 2023-12-24T10:11:30+01:00 Paleogeographic controls on the onset of the Antarctic circumpolar current Hill, DJ Haywood, AM Valdes, PJ Francis, JE Lunt, DJ Wade, BS Bowman, VC 2013-10-16 text https://discovery.ucl.ac.uk/id/eprint/1415294/1/Wade_Hill%20et%20al%202013.pdf https://discovery.ucl.ac.uk/id/eprint/1415294/ eng eng AMER GEOPHYSICAL UNION https://discovery.ucl.ac.uk/id/eprint/1415294/1/Wade_Hill%20et%20al%202013.pdf https://discovery.ucl.ac.uk/id/eprint/1415294/ open Geophysical Research Letters , 40 (19) pp. 5199-5204. (2013) Science & Technology Physical Sciences Geosciences Multidisciplinary Geology Antarctic Circumpolar Current paleogeography Oligocene paleoceanography gateways glaciation EASTERN NEW-ZEALAND FLUX ADJUSTMENTS CARBON-DIOXIDE SOUTHERN-OCEAN DRAKE PASSAGE EOCENE EVOLUTION SEA CIRCULATION Article 2013 ftucl 2023-11-27T13:07:32Z Development of the Antarctic Circumpolar Current (ACC) during the Cenozoic is controversial in terms of timing and its role in major climate transitions. Some propose that the development of the ACC was instrumental in the continental scale glaciation of Antarctica and climate cooling at the Eocene/Oligocene boundary. Here we present climate model results that show that a coherent ACC was not possible during the Oligocene due to Australasian paleogeography, despite deep water connections through the Drake Passage and Tasman Gateway and the initiation of Antarctic glaciation. The simulations of ocean currents compare well to paleoenvironmental records relating to the physical oceanography of the Oligocene and provide a framework for understanding apparently contradictory dating of the initiation of the ACC. We conclude that the northward motion of the Australasian land masses and the reconfiguration of the Tasman Seaway and Drake Passage are necessary preconditions for the formation of a strong, coherent ACC. Article in Journal/Newspaper Antarc* Antarctic Antarctica Drake Passage Southern Ocean University College London: UCL Discovery Antarctic Drake Passage New Zealand Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology Antarctic Circumpolar Current paleogeography Oligocene paleoceanography gateways glaciation EASTERN NEW-ZEALAND FLUX ADJUSTMENTS CARBON-DIOXIDE SOUTHERN-OCEAN DRAKE PASSAGE EOCENE EVOLUTION SEA CIRCULATION |
spellingShingle |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology Antarctic Circumpolar Current paleogeography Oligocene paleoceanography gateways glaciation EASTERN NEW-ZEALAND FLUX ADJUSTMENTS CARBON-DIOXIDE SOUTHERN-OCEAN DRAKE PASSAGE EOCENE EVOLUTION SEA CIRCULATION Hill, DJ Haywood, AM Valdes, PJ Francis, JE Lunt, DJ Wade, BS Bowman, VC Paleogeographic controls on the onset of the Antarctic circumpolar current |
topic_facet |
Science & Technology Physical Sciences Geosciences Multidisciplinary Geology Antarctic Circumpolar Current paleogeography Oligocene paleoceanography gateways glaciation EASTERN NEW-ZEALAND FLUX ADJUSTMENTS CARBON-DIOXIDE SOUTHERN-OCEAN DRAKE PASSAGE EOCENE EVOLUTION SEA CIRCULATION |
description |
Development of the Antarctic Circumpolar Current (ACC) during the Cenozoic is controversial in terms of timing and its role in major climate transitions. Some propose that the development of the ACC was instrumental in the continental scale glaciation of Antarctica and climate cooling at the Eocene/Oligocene boundary. Here we present climate model results that show that a coherent ACC was not possible during the Oligocene due to Australasian paleogeography, despite deep water connections through the Drake Passage and Tasman Gateway and the initiation of Antarctic glaciation. The simulations of ocean currents compare well to paleoenvironmental records relating to the physical oceanography of the Oligocene and provide a framework for understanding apparently contradictory dating of the initiation of the ACC. We conclude that the northward motion of the Australasian land masses and the reconfiguration of the Tasman Seaway and Drake Passage are necessary preconditions for the formation of a strong, coherent ACC. |
format |
Article in Journal/Newspaper |
author |
Hill, DJ Haywood, AM Valdes, PJ Francis, JE Lunt, DJ Wade, BS Bowman, VC |
author_facet |
Hill, DJ Haywood, AM Valdes, PJ Francis, JE Lunt, DJ Wade, BS Bowman, VC |
author_sort |
Hill, DJ |
title |
Paleogeographic controls on the onset of the Antarctic circumpolar current |
title_short |
Paleogeographic controls on the onset of the Antarctic circumpolar current |
title_full |
Paleogeographic controls on the onset of the Antarctic circumpolar current |
title_fullStr |
Paleogeographic controls on the onset of the Antarctic circumpolar current |
title_full_unstemmed |
Paleogeographic controls on the onset of the Antarctic circumpolar current |
title_sort |
paleogeographic controls on the onset of the antarctic circumpolar current |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2013 |
url |
https://discovery.ucl.ac.uk/id/eprint/1415294/1/Wade_Hill%20et%20al%202013.pdf https://discovery.ucl.ac.uk/id/eprint/1415294/ |
geographic |
Antarctic Drake Passage New Zealand Southern Ocean The Antarctic |
geographic_facet |
Antarctic Drake Passage New Zealand Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Southern Ocean |
op_source |
Geophysical Research Letters , 40 (19) pp. 5199-5204. (2013) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/1415294/1/Wade_Hill%20et%20al%202013.pdf https://discovery.ucl.ac.uk/id/eprint/1415294/ |
op_rights |
open |
_version_ |
1786166053263376384 |