Middle Jurassic-Early Cretaceous high-latitude sea-surface temperatures from the Southern Ocean
Although a division of the Phanerozoic climatic modes of the Earth into "greenhouse" and "icehouse" phases is widely accepted, whether or not polar ice developed during the relatively warm Jurassic and Cretaceous Periods is still under debate. In particular, there is a range of i...
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ftuloxford:oai:ora.ox.ac.uk:uuid:c1e6b60a-3ab9-4985-819a-75370203342c 2023-05-15T13:54:35+02:00 Middle Jurassic-Early Cretaceous high-latitude sea-surface temperatures from the Southern Ocean Jenkyns, H Schouten-Huibers, L Schouten, S Sinninghe Damsté, J Union, European Geosciences 2016-07-29 https://doi.org/10.5194/cpd-7-1339-2011 https://ora.ox.ac.uk/objects/uuid:c1e6b60a-3ab9-4985-819a-75370203342c eng eng Copernicus Publications doi:10.5194/cpd-7-1339-2011 https://ora.ox.ac.uk/objects/uuid:c1e6b60a-3ab9-4985-819a-75370203342c https://doi.org/10.5194/cpd-7-1339-2011 info:eu-repo/semantics/openAccess CC Attribution (CC BY) CC-BY Earth sciences Journal article 2016 ftuloxford https://doi.org/10.5194/cpd-7-1339-2011 2022-06-28T20:23:05Z Although a division of the Phanerozoic climatic modes of the Earth into "greenhouse" and "icehouse" phases is widely accepted, whether or not polar ice developed during the relatively warm Jurassic and Cretaceous Periods is still under debate. In particular, there is a range of isotopic and biotic evidence that favours the concept of discrete "cold snaps", marked particularly by migration of certain biota towards lower latitudes. Extension of the use of the palaeotemperature proxy TEX86 back to the middle Jurassic indicates that relatively warm sea-surface conditions (26-30°C) existed from this interval (~160 Ma) to the Early Cretaceous (~115 Ma) in the Southern Ocean. The Jurassic and Cretaceous "cold snaps" represent falls of only a few degrees. Belemnite δ18O data gives palaeotemperatures that are consistently lower by ~14°C than does TEX86 and these molluscs likely record conditions below the thermocline. Such long-term warm climatic conditions would only be compatible with the existence of continental ice and if appreciable areas of high altitude existed on Antarctica, and/or in other polar regions, during the Mesozoic Era. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean ORA - Oxford University Research Archive Southern Ocean |
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Open Polar |
collection |
ORA - Oxford University Research Archive |
op_collection_id |
ftuloxford |
language |
English |
topic |
Earth sciences |
spellingShingle |
Earth sciences Jenkyns, H Schouten-Huibers, L Schouten, S Sinninghe Damsté, J Middle Jurassic-Early Cretaceous high-latitude sea-surface temperatures from the Southern Ocean |
topic_facet |
Earth sciences |
description |
Although a division of the Phanerozoic climatic modes of the Earth into "greenhouse" and "icehouse" phases is widely accepted, whether or not polar ice developed during the relatively warm Jurassic and Cretaceous Periods is still under debate. In particular, there is a range of isotopic and biotic evidence that favours the concept of discrete "cold snaps", marked particularly by migration of certain biota towards lower latitudes. Extension of the use of the palaeotemperature proxy TEX86 back to the middle Jurassic indicates that relatively warm sea-surface conditions (26-30°C) existed from this interval (~160 Ma) to the Early Cretaceous (~115 Ma) in the Southern Ocean. The Jurassic and Cretaceous "cold snaps" represent falls of only a few degrees. Belemnite δ18O data gives palaeotemperatures that are consistently lower by ~14°C than does TEX86 and these molluscs likely record conditions below the thermocline. Such long-term warm climatic conditions would only be compatible with the existence of continental ice and if appreciable areas of high altitude existed on Antarctica, and/or in other polar regions, during the Mesozoic Era. |
author2 |
Union, European Geosciences |
format |
Article in Journal/Newspaper |
author |
Jenkyns, H Schouten-Huibers, L Schouten, S Sinninghe Damsté, J |
author_facet |
Jenkyns, H Schouten-Huibers, L Schouten, S Sinninghe Damsté, J |
author_sort |
Jenkyns, H |
title |
Middle Jurassic-Early Cretaceous high-latitude sea-surface temperatures from the Southern Ocean |
title_short |
Middle Jurassic-Early Cretaceous high-latitude sea-surface temperatures from the Southern Ocean |
title_full |
Middle Jurassic-Early Cretaceous high-latitude sea-surface temperatures from the Southern Ocean |
title_fullStr |
Middle Jurassic-Early Cretaceous high-latitude sea-surface temperatures from the Southern Ocean |
title_full_unstemmed |
Middle Jurassic-Early Cretaceous high-latitude sea-surface temperatures from the Southern Ocean |
title_sort |
middle jurassic-early cretaceous high-latitude sea-surface temperatures from the southern ocean |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/cpd-7-1339-2011 https://ora.ox.ac.uk/objects/uuid:c1e6b60a-3ab9-4985-819a-75370203342c |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_relation |
doi:10.5194/cpd-7-1339-2011 https://ora.ox.ac.uk/objects/uuid:c1e6b60a-3ab9-4985-819a-75370203342c https://doi.org/10.5194/cpd-7-1339-2011 |
op_rights |
info:eu-repo/semantics/openAccess CC Attribution (CC BY) |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/cpd-7-1339-2011 |
_version_ |
1766260577840136192 |