Early Pliocene increase in thermohaline overturning : a precondition for the development of the modern equatorial Pacific cold tongue
Unraveling the processes responsible for Earth's climate transition from an "El Nino-like state" during the warm early Pliocene into a modern-like "La Nina-dominated state" currently challenges the scientific community. Recently, the Pliocene climate switch has been linked t...
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:31492 2023-05-15T17:33:27+02:00 Early Pliocene increase in thermohaline overturning : a precondition for the development of the modern equatorial Pacific cold tongue Steph, Silke Tiedemann, Ralph Prange, Matthias Groeneveld, Jürgen Schulz, Michael Karl (Dr. phil.) Timmermann, Axel Nürnberg, Dirk Rühlemann, Carsten Saukel, Cornelia Haug, Gerald H. 2010 https://publishup.uni-potsdam.de/frontdoor/index/index/docId/31492 https://doi.org/10.1029/2008pa001645 eng eng https://publishup.uni-potsdam.de/frontdoor/index/index/docId/31492 https://doi.org/10.1029/2008pa001645 info:eu-repo/semantics/closedAccess Institut für Geowissenschaften article doc-type:article 2010 ftubpotsdam https://doi.org/10.1029/2008pa001645 2023-03-19T23:32:43Z Unraveling the processes responsible for Earth's climate transition from an "El Nino-like state" during the warm early Pliocene into a modern-like "La Nina-dominated state" currently challenges the scientific community. Recently, the Pliocene climate switch has been linked to oceanic thermocline shoaling at similar to 3 million years ago along with Earth's final transition into a bipolar icehouse world. Here we present Pliocene proxy data and climate model results, which suggest an earlier timing of the Pliocene climate switch and a different chain of forcing mechanisms. We show that the increase in North Atlantic meridional overturning circulation between 4.8 and 4.0 million years ago, initiated by the progressive closure of the Central American Seaway, triggered overall shoaling of the tropical thermocline. This preconditioned the turnaround from a warm eastern equatorial Pacific to the modern equatorial cold tongue state about 1 million years earlier than previously assumed. Since similar to 3.6-3.5 million years ago, the intensification of Northern Hemisphere glaciation resulted in a strengthening of the trade winds, thereby amplifying upwelling and biogenic productivity at low latitudes. Article in Journal/Newspaper North Atlantic University of Potsdam: publish.UP Pacific Paleoceanography 25 2 |
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University of Potsdam: publish.UP |
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ftubpotsdam |
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English |
topic |
Institut für Geowissenschaften |
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Institut für Geowissenschaften Steph, Silke Tiedemann, Ralph Prange, Matthias Groeneveld, Jürgen Schulz, Michael Karl (Dr. phil.) Timmermann, Axel Nürnberg, Dirk Rühlemann, Carsten Saukel, Cornelia Haug, Gerald H. Early Pliocene increase in thermohaline overturning : a precondition for the development of the modern equatorial Pacific cold tongue |
topic_facet |
Institut für Geowissenschaften |
description |
Unraveling the processes responsible for Earth's climate transition from an "El Nino-like state" during the warm early Pliocene into a modern-like "La Nina-dominated state" currently challenges the scientific community. Recently, the Pliocene climate switch has been linked to oceanic thermocline shoaling at similar to 3 million years ago along with Earth's final transition into a bipolar icehouse world. Here we present Pliocene proxy data and climate model results, which suggest an earlier timing of the Pliocene climate switch and a different chain of forcing mechanisms. We show that the increase in North Atlantic meridional overturning circulation between 4.8 and 4.0 million years ago, initiated by the progressive closure of the Central American Seaway, triggered overall shoaling of the tropical thermocline. This preconditioned the turnaround from a warm eastern equatorial Pacific to the modern equatorial cold tongue state about 1 million years earlier than previously assumed. Since similar to 3.6-3.5 million years ago, the intensification of Northern Hemisphere glaciation resulted in a strengthening of the trade winds, thereby amplifying upwelling and biogenic productivity at low latitudes. |
format |
Article in Journal/Newspaper |
author |
Steph, Silke Tiedemann, Ralph Prange, Matthias Groeneveld, Jürgen Schulz, Michael Karl (Dr. phil.) Timmermann, Axel Nürnberg, Dirk Rühlemann, Carsten Saukel, Cornelia Haug, Gerald H. |
author_facet |
Steph, Silke Tiedemann, Ralph Prange, Matthias Groeneveld, Jürgen Schulz, Michael Karl (Dr. phil.) Timmermann, Axel Nürnberg, Dirk Rühlemann, Carsten Saukel, Cornelia Haug, Gerald H. |
author_sort |
Steph, Silke |
title |
Early Pliocene increase in thermohaline overturning : a precondition for the development of the modern equatorial Pacific cold tongue |
title_short |
Early Pliocene increase in thermohaline overturning : a precondition for the development of the modern equatorial Pacific cold tongue |
title_full |
Early Pliocene increase in thermohaline overturning : a precondition for the development of the modern equatorial Pacific cold tongue |
title_fullStr |
Early Pliocene increase in thermohaline overturning : a precondition for the development of the modern equatorial Pacific cold tongue |
title_full_unstemmed |
Early Pliocene increase in thermohaline overturning : a precondition for the development of the modern equatorial Pacific cold tongue |
title_sort |
early pliocene increase in thermohaline overturning : a precondition for the development of the modern equatorial pacific cold tongue |
publishDate |
2010 |
url |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/31492 https://doi.org/10.1029/2008pa001645 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/31492 https://doi.org/10.1029/2008pa001645 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1029/2008pa001645 |
container_title |
Paleoceanography |
container_volume |
25 |
container_issue |
2 |
_version_ |
1766131953963106304 |