Multiple states in the late Eocene ocean circulation
The Eocene-Oligocene Transition (EOT) marks a major step within the Cenozoic climate in going from a greenhouse into an icehouse state, with the formation of a continental-scale Antarctic ice sheet. The roles of steadily decreasing CO2 concentrations versus changes in ocean circulation at the EOT ar...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/363505 2023-11-12T04:06:41+01:00 Multiple states in the late Eocene ocean circulation Baatsen, M. L.J. von der Heydt, A. S. Kliphuis, M. Viebahn, J. Dijkstra, H. A. Sub Physical Oceanography Marine and Atmospheric Research 2018-04-01 application/pdf https://dspace.library.uu.nl/handle/1874/363505 en eng 0921-8181 https://dspace.library.uu.nl/handle/1874/363505 info:eu-repo/semantics/OpenAccess Global ocean circulation Multiple states Paleobathymetry Past climate transitions Taverne Global and Planetary Change Oceanography Article 2018 ftunivutrecht 2023-11-01T23:16:57Z The Eocene-Oligocene Transition (EOT) marks a major step within the Cenozoic climate in going from a greenhouse into an icehouse state, with the formation of a continental-scale Antarctic ice sheet. The roles of steadily decreasing CO2 concentrations versus changes in ocean circulation at the EOT are still debated and the threshold for Antarctic glaciation is obscured by uncertainties in global geometry. Here, a detailed study of the late Eocene ocean circulation is carried out using an ocean general circulation model under two slightly different geography reconstructions of the middle-to-late Eocene (38 Ma). Using the same atmospheric forcing, both geographies give a profoundly different equilibrium ocean circulation state. The underlying reason for this sensitivity is the presence of multiple equilibria characterised by either North or South Pacific deep water formation. A possible shift from a southern towards a northern overturning circulation would result in significant changes in the global heat distribution and consequently make the Southern Hemisphere climate more susceptible for significant cooling and ice sheet formation on Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Utrecht University Repository Antarctic Pacific |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Global ocean circulation Multiple states Paleobathymetry Past climate transitions Taverne Global and Planetary Change Oceanography |
spellingShingle |
Global ocean circulation Multiple states Paleobathymetry Past climate transitions Taverne Global and Planetary Change Oceanography Baatsen, M. L.J. von der Heydt, A. S. Kliphuis, M. Viebahn, J. Dijkstra, H. A. Multiple states in the late Eocene ocean circulation |
topic_facet |
Global ocean circulation Multiple states Paleobathymetry Past climate transitions Taverne Global and Planetary Change Oceanography |
description |
The Eocene-Oligocene Transition (EOT) marks a major step within the Cenozoic climate in going from a greenhouse into an icehouse state, with the formation of a continental-scale Antarctic ice sheet. The roles of steadily decreasing CO2 concentrations versus changes in ocean circulation at the EOT are still debated and the threshold for Antarctic glaciation is obscured by uncertainties in global geometry. Here, a detailed study of the late Eocene ocean circulation is carried out using an ocean general circulation model under two slightly different geography reconstructions of the middle-to-late Eocene (38 Ma). Using the same atmospheric forcing, both geographies give a profoundly different equilibrium ocean circulation state. The underlying reason for this sensitivity is the presence of multiple equilibria characterised by either North or South Pacific deep water formation. A possible shift from a southern towards a northern overturning circulation would result in significant changes in the global heat distribution and consequently make the Southern Hemisphere climate more susceptible for significant cooling and ice sheet formation on Antarctica. |
author2 |
Sub Physical Oceanography Marine and Atmospheric Research |
format |
Article in Journal/Newspaper |
author |
Baatsen, M. L.J. von der Heydt, A. S. Kliphuis, M. Viebahn, J. Dijkstra, H. A. |
author_facet |
Baatsen, M. L.J. von der Heydt, A. S. Kliphuis, M. Viebahn, J. Dijkstra, H. A. |
author_sort |
Baatsen, M. L.J. |
title |
Multiple states in the late Eocene ocean circulation |
title_short |
Multiple states in the late Eocene ocean circulation |
title_full |
Multiple states in the late Eocene ocean circulation |
title_fullStr |
Multiple states in the late Eocene ocean circulation |
title_full_unstemmed |
Multiple states in the late Eocene ocean circulation |
title_sort |
multiple states in the late eocene ocean circulation |
publishDate |
2018 |
url |
https://dspace.library.uu.nl/handle/1874/363505 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet |
op_relation |
0921-8181 https://dspace.library.uu.nl/handle/1874/363505 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782327713577566208 |