2005: On the role of the Drake Passage in controlling the stability of the ocean’s thermohaline circulation
The role of a Southern Ocean gateway in permitting multiple equilibria of the global ocean thermohaline circulation is examined. In particular, necessary conditions for the existence of multiple equilibria are studied with a coupled climate model, wherein stable solutions are obtained for a range of...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.684.7549 2023-05-15T13:43:31+02:00 2005: On the role of the Drake Passage in controlling the stability of the ocean’s thermohaline circulation Willem P. Sijp Matthew H. England The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.7549 http://web.science.unsw.edu.au/%7Ematthew/SE_2005.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.7549 http://web.science.unsw.edu.au/%7Ematthew/SE_2005.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://web.science.unsw.edu.au/%7Ematthew/SE_2005.pdf text ftciteseerx 2016-01-08T18:04:16Z The role of a Southern Ocean gateway in permitting multiple equilibria of the global ocean thermohaline circulation is examined. In particular, necessary conditions for the existence of multiple equilibria are studied with a coupled climate model, wherein stable solutions are obtained for a range of bathymetries with varying Drake Passage (DP) depths. No transitions to a Northern Hemisphere (NH) overturning state are found when the Drake Passage sill is shallower than a critical depth (1100 m in the model described herein). This preference for Southern Hemisphere sinking is a result of the particularly cold conditions of the Antarctic Bottom Water (AABW) formation regions compared to the NH deep-water formation zones. In a shallow or closed DP configuration, this forces an exclusive production of deep/bottom water in the Southern Hemisphere. Increasing the depth of the Drake Passage sill causes a gradual vertical decoupling in Atlantic circulation, removing the influence of AABW from the upper 2000 m of the Atlantic Ocean. When the DP is sufficiently deep, this shifts the interaction between a North Atlantic Deep Water (NADW) cell and an AABW cell to an interaction between an (shallower) Antarctic Intermediate Water cell and an NADW cell. This latter situation allows transitions to a Northern Hemisphere overturning state. 1. Text Antarc* Antarctic Drake Passage NADW North Atlantic Deep Water North Atlantic Southern Ocean Unknown Antarctic Drake Passage Southern Ocean The Antarctic |
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English |
description |
The role of a Southern Ocean gateway in permitting multiple equilibria of the global ocean thermohaline circulation is examined. In particular, necessary conditions for the existence of multiple equilibria are studied with a coupled climate model, wherein stable solutions are obtained for a range of bathymetries with varying Drake Passage (DP) depths. No transitions to a Northern Hemisphere (NH) overturning state are found when the Drake Passage sill is shallower than a critical depth (1100 m in the model described herein). This preference for Southern Hemisphere sinking is a result of the particularly cold conditions of the Antarctic Bottom Water (AABW) formation regions compared to the NH deep-water formation zones. In a shallow or closed DP configuration, this forces an exclusive production of deep/bottom water in the Southern Hemisphere. Increasing the depth of the Drake Passage sill causes a gradual vertical decoupling in Atlantic circulation, removing the influence of AABW from the upper 2000 m of the Atlantic Ocean. When the DP is sufficiently deep, this shifts the interaction between a North Atlantic Deep Water (NADW) cell and an AABW cell to an interaction between an (shallower) Antarctic Intermediate Water cell and an NADW cell. This latter situation allows transitions to a Northern Hemisphere overturning state. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Willem P. Sijp Matthew H. England |
spellingShingle |
Willem P. Sijp Matthew H. England 2005: On the role of the Drake Passage in controlling the stability of the ocean’s thermohaline circulation |
author_facet |
Willem P. Sijp Matthew H. England |
author_sort |
Willem P. Sijp |
title |
2005: On the role of the Drake Passage in controlling the stability of the ocean’s thermohaline circulation |
title_short |
2005: On the role of the Drake Passage in controlling the stability of the ocean’s thermohaline circulation |
title_full |
2005: On the role of the Drake Passage in controlling the stability of the ocean’s thermohaline circulation |
title_fullStr |
2005: On the role of the Drake Passage in controlling the stability of the ocean’s thermohaline circulation |
title_full_unstemmed |
2005: On the role of the Drake Passage in controlling the stability of the ocean’s thermohaline circulation |
title_sort |
2005: on the role of the drake passage in controlling the stability of the ocean’s thermohaline circulation |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.7549 http://web.science.unsw.edu.au/%7Ematthew/SE_2005.pdf |
geographic |
Antarctic Drake Passage Southern Ocean The Antarctic |
geographic_facet |
Antarctic Drake Passage Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Drake Passage NADW North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Drake Passage NADW North Atlantic Deep Water North Atlantic Southern Ocean |
op_source |
http://web.science.unsw.edu.au/%7Ematthew/SE_2005.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.684.7549 http://web.science.unsw.edu.au/%7Ematthew/SE_2005.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766189907694321664 |