Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations
The intensification of Northern Hemisphere glaciations at the end of the Pliocene epoch marks one of the most substantial climatic shifts of the Cenozoic. Despite global cooling, sea surface temperatures in the high latitude North Atlantic Ocean rose between 2.9-2.7 million years ago. Here we presen...
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SPRINGERNATURE
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ftubkoeln:oai:USBKOELN.ub.uni-koeln.de:59670 2023-05-15T16:41:09+02:00 Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations Kaboth-Bahr, Stefanie Bahr, Andre Stepanek, Christian Catunda, Maria Carolina Amorim Karas, Cyrus Ziegler, Martin Garcia-Gallardo, Angela Grunert, Patrick 2021 https://kups.ub.uni-koeln.de/59670/ eng eng SPRINGERNATURE Kaboth-Bahr, Stefanie orcid:0000-0002-4449-2938 , Bahr, Andre, Stepanek, Christian orcid:0000-0002-3912-6271 , Catunda, Maria Carolina Amorim, Karas, Cyrus orcid:0000-0002-7436-5016 , Ziegler, Martin orcid:0000-0003-3198-6434 , Garcia-Gallardo, Angela and Grunert, Patrick (2021). Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations. Commun. Earth Environ., 2 (1). LONDON: SPRINGERNATURE. ISSN 2662-4435 ddc:no doc-type:article publishedVersion 2021 ftubkoeln 2022-11-09T07:34:27Z The intensification of Northern Hemisphere glaciations at the end of the Pliocene epoch marks one of the most substantial climatic shifts of the Cenozoic. Despite global cooling, sea surface temperatures in the high latitude North Atlantic Ocean rose between 2.9-2.7 million years ago. Here we present sedimentary geochemical proxy data from the Gulf of Cadiz to reconstruct the variability of Mediterranean Outflow Water, an important heat source to the North Atlantic. We find evidence for enhanced production of Mediterranean Outflow from the mid-Pliocene to the late Pliocene which we infer could have driven a sub-surface heat channel into the high-latitude North Atlantic. We then use Earth System Models to constrain the impact of enhanced Mediterranean Outflow production on the northward heat transport in the North Atlantic. In accord with the proxy data, the numerical model results support the formation of a sub-surface channel that pumped heat from the subtropics into the high latitude North Atlantic. We further suggest that this mechanism could have delayed ice sheet growth at the end of the Pliocene. Subsurface heat transfer from the subtropical Atlantic Ocean to high latitudes during the mid-to-late Pliocene may have been responsible for a delay in the intensification of Northern Hemisphere glaciations, according to sedimentary proxy records and numerical modelling. Article in Journal/Newspaper Ice Sheet North Atlantic Cologne University: KUPS |
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Cologne University: KUPS |
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English |
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ddc:no Kaboth-Bahr, Stefanie Bahr, Andre Stepanek, Christian Catunda, Maria Carolina Amorim Karas, Cyrus Ziegler, Martin Garcia-Gallardo, Angela Grunert, Patrick Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations |
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ddc:no |
description |
The intensification of Northern Hemisphere glaciations at the end of the Pliocene epoch marks one of the most substantial climatic shifts of the Cenozoic. Despite global cooling, sea surface temperatures in the high latitude North Atlantic Ocean rose between 2.9-2.7 million years ago. Here we present sedimentary geochemical proxy data from the Gulf of Cadiz to reconstruct the variability of Mediterranean Outflow Water, an important heat source to the North Atlantic. We find evidence for enhanced production of Mediterranean Outflow from the mid-Pliocene to the late Pliocene which we infer could have driven a sub-surface heat channel into the high-latitude North Atlantic. We then use Earth System Models to constrain the impact of enhanced Mediterranean Outflow production on the northward heat transport in the North Atlantic. In accord with the proxy data, the numerical model results support the formation of a sub-surface channel that pumped heat from the subtropics into the high latitude North Atlantic. We further suggest that this mechanism could have delayed ice sheet growth at the end of the Pliocene. Subsurface heat transfer from the subtropical Atlantic Ocean to high latitudes during the mid-to-late Pliocene may have been responsible for a delay in the intensification of Northern Hemisphere glaciations, according to sedimentary proxy records and numerical modelling. |
format |
Article in Journal/Newspaper |
author |
Kaboth-Bahr, Stefanie Bahr, Andre Stepanek, Christian Catunda, Maria Carolina Amorim Karas, Cyrus Ziegler, Martin Garcia-Gallardo, Angela Grunert, Patrick |
author_facet |
Kaboth-Bahr, Stefanie Bahr, Andre Stepanek, Christian Catunda, Maria Carolina Amorim Karas, Cyrus Ziegler, Martin Garcia-Gallardo, Angela Grunert, Patrick |
author_sort |
Kaboth-Bahr, Stefanie |
title |
Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations |
title_short |
Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations |
title_full |
Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations |
title_fullStr |
Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations |
title_full_unstemmed |
Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations |
title_sort |
mediterranean heat injection to the north atlantic delayed the intensification of northern hemisphere glaciations |
publisher |
SPRINGERNATURE |
publishDate |
2021 |
url |
https://kups.ub.uni-koeln.de/59670/ |
genre |
Ice Sheet North Atlantic |
genre_facet |
Ice Sheet North Atlantic |
op_relation |
Kaboth-Bahr, Stefanie orcid:0000-0002-4449-2938 , Bahr, Andre, Stepanek, Christian orcid:0000-0002-3912-6271 , Catunda, Maria Carolina Amorim, Karas, Cyrus orcid:0000-0002-7436-5016 , Ziegler, Martin orcid:0000-0003-3198-6434 , Garcia-Gallardo, Angela and Grunert, Patrick (2021). Mediterranean heat injection to the North Atlantic delayed the intensification of Northern Hemisphere glaciations. Commun. Earth Environ., 2 (1). LONDON: SPRINGERNATURE. ISSN 2662-4435 |
_version_ |
1766031583286919168 |