Evidence for late Oligocene establishment of the Antarctic Circumpolar Current.
Removal of the last impediment to circum-Antarctic flow – opening of the Drake Passage between Antarctica and South America – is essential to establishment of the ACC, and has been placed in both the earliest Oligocene and earliest Miocene on the basis of paleomagnetic reconstructions. The Tasman Ga...
Published in: | Earth and Planetary Science Letters |
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Online Access: | http://eprints.esc.cam.ac.uk/1776/ http://eprints.esc.cam.ac.uk/1776/1/Evidence_-_McCave.pdf https://doi.org/10.1016/j.epsl.2005.04.025 |
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ftucambridgeesc:oai:eprints.esc.cam.ac.uk:1776 2023-05-15T13:32:21+02:00 Evidence for late Oligocene establishment of the Antarctic Circumpolar Current. Pfuhl, H. A. McCave, I. N. 2005-07 application/pdf http://eprints.esc.cam.ac.uk/1776/ http://eprints.esc.cam.ac.uk/1776/1/Evidence_-_McCave.pdf https://doi.org/10.1016/j.epsl.2005.04.025 en eng http://eprints.esc.cam.ac.uk/1776/1/Evidence_-_McCave.pdf Pfuhl, H. A. and McCave, I. N. (2005) Evidence for late Oligocene establishment of the Antarctic Circumpolar Current. Earth and Planetary Science Letters, 235 (3-4). pp. 715-728. ISSN 0012-821X DOI https://doi.org/10.1016/j.epsl.2005.04.025 <https://doi.org/10.1016/j.epsl.2005.04.025> 01 - Climate Change and Earth-Ocean Atmosphere Systems Article PeerReviewed 2005 ftucambridgeesc https://doi.org/10.1016/j.epsl.2005.04.025 2020-08-27T18:09:00Z Removal of the last impediment to circum-Antarctic flow – opening of the Drake Passage between Antarctica and South America – is essential to establishment of the ACC, and has been placed in both the earliest Oligocene and earliest Miocene on the basis of paleomagnetic reconstructions. The Tasman Gateway between Antarctica and Tasmania notably deepened following ~33.5 Ma. Completion of the ACC circuit has been seen as the key to major growth of the East Antarctic Ice Sheet by thermal isolation of the continent. An alternative argument attributes ice sheet growth to changes in atmospheric pCO2. We present evidence on current strength and water-mass properties suggesting a clear increase in flow speed and homogeneity of Southern Ocean water masses in the latest Oligocene after about 23.95 Ma, marking establishment of the ACC, attributable to deep opening of Drake Passage. The Mi-1 glaciation may be a consequence. Establishment of a permanent, low altitude ice sheet does not appear to take place prior to mid-Miocene cooling. Article in Journal/Newspaper Antarc* Antarctic Antarctica Drake Passage Ice Sheet Southern Ocean University of Cambridge, Department of Earth Sciences: ESC Publications Antarctic Southern Ocean The Antarctic Drake Passage East Antarctic Ice Sheet Earth and Planetary Science Letters 235 3-4 715 728 |
institution |
Open Polar |
collection |
University of Cambridge, Department of Earth Sciences: ESC Publications |
op_collection_id |
ftucambridgeesc |
language |
English |
topic |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
spellingShingle |
01 - Climate Change and Earth-Ocean Atmosphere Systems Pfuhl, H. A. McCave, I. N. Evidence for late Oligocene establishment of the Antarctic Circumpolar Current. |
topic_facet |
01 - Climate Change and Earth-Ocean Atmosphere Systems |
description |
Removal of the last impediment to circum-Antarctic flow – opening of the Drake Passage between Antarctica and South America – is essential to establishment of the ACC, and has been placed in both the earliest Oligocene and earliest Miocene on the basis of paleomagnetic reconstructions. The Tasman Gateway between Antarctica and Tasmania notably deepened following ~33.5 Ma. Completion of the ACC circuit has been seen as the key to major growth of the East Antarctic Ice Sheet by thermal isolation of the continent. An alternative argument attributes ice sheet growth to changes in atmospheric pCO2. We present evidence on current strength and water-mass properties suggesting a clear increase in flow speed and homogeneity of Southern Ocean water masses in the latest Oligocene after about 23.95 Ma, marking establishment of the ACC, attributable to deep opening of Drake Passage. The Mi-1 glaciation may be a consequence. Establishment of a permanent, low altitude ice sheet does not appear to take place prior to mid-Miocene cooling. |
format |
Article in Journal/Newspaper |
author |
Pfuhl, H. A. McCave, I. N. |
author_facet |
Pfuhl, H. A. McCave, I. N. |
author_sort |
Pfuhl, H. A. |
title |
Evidence for late Oligocene establishment of the Antarctic Circumpolar Current. |
title_short |
Evidence for late Oligocene establishment of the Antarctic Circumpolar Current. |
title_full |
Evidence for late Oligocene establishment of the Antarctic Circumpolar Current. |
title_fullStr |
Evidence for late Oligocene establishment of the Antarctic Circumpolar Current. |
title_full_unstemmed |
Evidence for late Oligocene establishment of the Antarctic Circumpolar Current. |
title_sort |
evidence for late oligocene establishment of the antarctic circumpolar current. |
publishDate |
2005 |
url |
http://eprints.esc.cam.ac.uk/1776/ http://eprints.esc.cam.ac.uk/1776/1/Evidence_-_McCave.pdf https://doi.org/10.1016/j.epsl.2005.04.025 |
geographic |
Antarctic Southern Ocean The Antarctic Drake Passage East Antarctic Ice Sheet |
geographic_facet |
Antarctic Southern Ocean The Antarctic Drake Passage East Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica Drake Passage Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Ice Sheet Southern Ocean |
op_relation |
http://eprints.esc.cam.ac.uk/1776/1/Evidence_-_McCave.pdf Pfuhl, H. A. and McCave, I. N. (2005) Evidence for late Oligocene establishment of the Antarctic Circumpolar Current. Earth and Planetary Science Letters, 235 (3-4). pp. 715-728. ISSN 0012-821X DOI https://doi.org/10.1016/j.epsl.2005.04.025 <https://doi.org/10.1016/j.epsl.2005.04.025> |
op_doi |
https://doi.org/10.1016/j.epsl.2005.04.025 |
container_title |
Earth and Planetary Science Letters |
container_volume |
235 |
container_issue |
3-4 |
container_start_page |
715 |
op_container_end_page |
728 |
_version_ |
1766026112106758144 |