Model simulations of early westward flow across the Tasman Gateway during the early Eocene
The timing and role in ocean circulation and climate of the opening of Southern Ocean gateways is as yet elusive. Recent micropalaeontological studies suggest the onset of westward throughflow of surface waters from the SW Pacific into the Australo-Antarctic Gulf through a southern shallow opening o...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00013689 2023-05-15T13:34:48+02:00 Model simulations of early westward flow across the Tasman Gateway during the early Eocene Sijp, Willem P. von der Heydt, Anna S. Bijl, Peter K. 2016-04 electronic https://doi.org/10.5194/cp-12-807-2016 https://noa.gwlb.de/receive/cop_mods_00013689 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013645/cp-12-807-2016.pdf https://cp.copernicus.org/articles/12/807/2016/cp-12-807-2016.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-12-807-2016 https://noa.gwlb.de/receive/cop_mods_00013689 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013645/cp-12-807-2016.pdf https://cp.copernicus.org/articles/12/807/2016/cp-12-807-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/cp-12-807-2016 2022-02-08T22:55:30Z The timing and role in ocean circulation and climate of the opening of Southern Ocean gateways is as yet elusive. Recent micropalaeontological studies suggest the onset of westward throughflow of surface waters from the SW Pacific into the Australo-Antarctic Gulf through a southern shallow opening of the Tasman Gateway from 49–50 Ma onwards, a direction that is counter to the present-day eastward-flowing Antarctic Circumpolar Current. Here, we present the first model results specific to the early-to-middle Eocene where, in agreement with the field evidence, southerly shallow opening of the Tasman Gateway indeed causes a westward flow across the Tasman Gateway. As a result, modelled estimates of dinoflagellate biogeography are in agreement with the recent findings. Crucially, in this situation where Australia is still situated far south and almost attached to Antarctica, the Drake Passage must be sufficiently restricted to allow the prevailing easterly wind pattern to set up this southerly restricted westward flow. In contrast, an open Drake Passage, up to 517 m deep, leads to an eastward flow, even when the Tasman Gateway and the Australo-Antarctic gulf are entirely contained within the latitudes of easterly wind. Article in Journal/Newspaper Antarc* Antarctic Antarctica Drake Passage Southern Ocean Niedersächsisches Online-Archiv NOA Antarctic Drake Passage Pacific Southern Ocean Climate of the Past 12 4 807 817 |
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English |
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article Verlagsveröffentlichung Sijp, Willem P. von der Heydt, Anna S. Bijl, Peter K. Model simulations of early westward flow across the Tasman Gateway during the early Eocene |
topic_facet |
article Verlagsveröffentlichung |
description |
The timing and role in ocean circulation and climate of the opening of Southern Ocean gateways is as yet elusive. Recent micropalaeontological studies suggest the onset of westward throughflow of surface waters from the SW Pacific into the Australo-Antarctic Gulf through a southern shallow opening of the Tasman Gateway from 49–50 Ma onwards, a direction that is counter to the present-day eastward-flowing Antarctic Circumpolar Current. Here, we present the first model results specific to the early-to-middle Eocene where, in agreement with the field evidence, southerly shallow opening of the Tasman Gateway indeed causes a westward flow across the Tasman Gateway. As a result, modelled estimates of dinoflagellate biogeography are in agreement with the recent findings. Crucially, in this situation where Australia is still situated far south and almost attached to Antarctica, the Drake Passage must be sufficiently restricted to allow the prevailing easterly wind pattern to set up this southerly restricted westward flow. In contrast, an open Drake Passage, up to 517 m deep, leads to an eastward flow, even when the Tasman Gateway and the Australo-Antarctic gulf are entirely contained within the latitudes of easterly wind. |
format |
Article in Journal/Newspaper |
author |
Sijp, Willem P. von der Heydt, Anna S. Bijl, Peter K. |
author_facet |
Sijp, Willem P. von der Heydt, Anna S. Bijl, Peter K. |
author_sort |
Sijp, Willem P. |
title |
Model simulations of early westward flow across the Tasman Gateway during the early Eocene |
title_short |
Model simulations of early westward flow across the Tasman Gateway during the early Eocene |
title_full |
Model simulations of early westward flow across the Tasman Gateway during the early Eocene |
title_fullStr |
Model simulations of early westward flow across the Tasman Gateway during the early Eocene |
title_full_unstemmed |
Model simulations of early westward flow across the Tasman Gateway during the early Eocene |
title_sort |
model simulations of early westward flow across the tasman gateway during the early eocene |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/cp-12-807-2016 https://noa.gwlb.de/receive/cop_mods_00013689 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013645/cp-12-807-2016.pdf https://cp.copernicus.org/articles/12/807/2016/cp-12-807-2016.pdf |
geographic |
Antarctic Drake Passage Pacific Southern Ocean |
geographic_facet |
Antarctic Drake Passage Pacific Southern Ocean |
genre |
Antarc* Antarctic Antarctica Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Southern Ocean |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-12-807-2016 https://noa.gwlb.de/receive/cop_mods_00013689 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013645/cp-12-807-2016.pdf https://cp.copernicus.org/articles/12/807/2016/cp-12-807-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-12-807-2016 |
container_title |
Climate of the Past |
container_volume |
12 |
container_issue |
4 |
container_start_page |
807 |
op_container_end_page |
817 |
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