Surface Ocean Cooling in the Eocene North Atlantic Coincides With Declining Atmospheric CO 2
The Eocene (56-34 million years ago) is characterized by declining sea surface temperatures (SSTs) in the low latitudes (similar to 4 degrees C) and high southern latitudes (similar to 8-11 degrees C), in accord with decreasing CO2 estimates. However, in the mid-to-high northern latitudes there is n...
Published in: | Geophysical Research Letters |
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2023
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Online Access: | https://doi.org/10.1029/2023GL105448 |
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ftncar:oai:drupal-site.org:articles_26888 2024-02-11T10:06:03+01:00 Surface Ocean Cooling in the Eocene North Atlantic Coincides With Declining Atmospheric CO 2 Inglis, Gordon N. (author) Bhatia, Rehemat (author) Evans, David (author) Zhu, Jiang (author) Müller, Wolfgang (author) Mattey, David (author) Thornalley, David J. R. (author) Stockey, Richard G. (author) Wade, Bridget S. (author) 2023-12-28 https://doi.org/10.1029/2023GL105448 unknown Geophysical Research Letters--Geophysical Research Letters--0094-8276--1944-8007 articles:26888 doi:10.1029/2023GL105448 ark:/85065/d7320105 article 2023 ftncar https://doi.org/10.1029/2023GL105448 2024-01-15T19:20:12Z The Eocene (56-34 million years ago) is characterized by declining sea surface temperatures (SSTs) in the low latitudes (similar to 4 degrees C) and high southern latitudes (similar to 8-11 degrees C), in accord with decreasing CO2 estimates. However, in the mid-to-high northern latitudes there is no evidence for surface water cooling, suggesting thermal decoupling between northern and southern hemispheres and additional non-CO2 controls. To explore this further, we present a multi-proxy (Mg/Ca, delta O-18, TEX86) SST record from Bass River in the western North Atlantic. Our compiled multi-proxy SST record confirms a net decline in SSTs (similar to 4 degrees C) between the early Eocene Climatic Optimum (53.3-49.1 Ma) and mid-Eocene (similar to 44-41 Ma), supporting declining atmospheric CO2 as the primary mechanism of Eocene cooling. However, from the mid-Eocene onwards, east-west North Atlantic temperature gradients exhibit different trends, which we attribute to incursion of warmer waters into the eastern North Atlantic and inception of Northern Component Water across the early-middle Eocene transition. 2202777 Article in Journal/Newspaper North Atlantic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Geophysical Research Letters 50 24 |
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Open Polar |
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OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
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ftncar |
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description |
The Eocene (56-34 million years ago) is characterized by declining sea surface temperatures (SSTs) in the low latitudes (similar to 4 degrees C) and high southern latitudes (similar to 8-11 degrees C), in accord with decreasing CO2 estimates. However, in the mid-to-high northern latitudes there is no evidence for surface water cooling, suggesting thermal decoupling between northern and southern hemispheres and additional non-CO2 controls. To explore this further, we present a multi-proxy (Mg/Ca, delta O-18, TEX86) SST record from Bass River in the western North Atlantic. Our compiled multi-proxy SST record confirms a net decline in SSTs (similar to 4 degrees C) between the early Eocene Climatic Optimum (53.3-49.1 Ma) and mid-Eocene (similar to 44-41 Ma), supporting declining atmospheric CO2 as the primary mechanism of Eocene cooling. However, from the mid-Eocene onwards, east-west North Atlantic temperature gradients exhibit different trends, which we attribute to incursion of warmer waters into the eastern North Atlantic and inception of Northern Component Water across the early-middle Eocene transition. 2202777 |
author2 |
Inglis, Gordon N. (author) Bhatia, Rehemat (author) Evans, David (author) Zhu, Jiang (author) Müller, Wolfgang (author) Mattey, David (author) Thornalley, David J. R. (author) Stockey, Richard G. (author) Wade, Bridget S. (author) |
format |
Article in Journal/Newspaper |
title |
Surface Ocean Cooling in the Eocene North Atlantic Coincides With Declining Atmospheric CO 2 |
spellingShingle |
Surface Ocean Cooling in the Eocene North Atlantic Coincides With Declining Atmospheric CO 2 |
title_short |
Surface Ocean Cooling in the Eocene North Atlantic Coincides With Declining Atmospheric CO 2 |
title_full |
Surface Ocean Cooling in the Eocene North Atlantic Coincides With Declining Atmospheric CO 2 |
title_fullStr |
Surface Ocean Cooling in the Eocene North Atlantic Coincides With Declining Atmospheric CO 2 |
title_full_unstemmed |
Surface Ocean Cooling in the Eocene North Atlantic Coincides With Declining Atmospheric CO 2 |
title_sort |
surface ocean cooling in the eocene north atlantic coincides with declining atmospheric co 2 |
publishDate |
2023 |
url |
https://doi.org/10.1029/2023GL105448 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Geophysical Research Letters--Geophysical Research Letters--0094-8276--1944-8007 articles:26888 doi:10.1029/2023GL105448 ark:/85065/d7320105 |
op_doi |
https://doi.org/10.1029/2023GL105448 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
24 |
_version_ |
1790603479360733184 |