Cooling and ice growth across the Eocene-Oligocene transition
The Eocene-Oligocene (E-O) climate transition (ca. 34 Ma) marks a period of Antarctic ice growth and a major step from early Cenozoic greenhouse conditions toward today's glaciated climate state. The transition is represented by an increase in deep-sea benthic foraminiferal oxygen isotope (18O)...
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Geological Society of America
2008
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/10101/ https://doi.org/10.1130/G24584A.1 |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:10101 2023-05-15T13:39:53+02:00 Cooling and ice growth across the Eocene-Oligocene transition Lear, Caroline Helen Bailey, Trevor R. Pearson, Paul Nicholas Coxall, Helen Kathrine Rosenthal, Yair 2008-03 https://orca.cardiff.ac.uk/id/eprint/10101/ https://doi.org/10.1130/G24584A.1 unknown Geological Society of America Lear, Caroline Helen https://orca.cardiff.ac.uk/view/cardiffauthors/A048848V.html orcid:0000-0002-7533-4430 orcid:0000-0002-7533-4430, Bailey, Trevor R., Pearson, Paul Nicholas https://orca.cardiff.ac.uk/view/cardiffauthors/A0179150.html orcid:0000-0003-4628-9818 orcid:0000-0003-4628-9818, Coxall, Helen Kathrine https://orca.cardiff.ac.uk/view/cardiffauthors/A007483I.html and Rosenthal, Yair 2008. Cooling and ice growth across the Eocene-Oligocene transition. Geology 36 (3) , pp. 251-254. 10.1130/G24584A.1 https://doi.org/10.1130/G24584A.1 doi:10.1130/G24584A.1 GC Oceanography QE Geology Article PeerReviewed 2008 ftunivcardiff https://doi.org/10.1130/G24584A.1 2022-10-20T22:34:13Z The Eocene-Oligocene (E-O) climate transition (ca. 34 Ma) marks a period of Antarctic ice growth and a major step from early Cenozoic greenhouse conditions toward today's glaciated climate state. The transition is represented by an increase in deep-sea benthic foraminiferal oxygen isotope (18O) values occurring in two main steps that reflect the temperature and 18O of seawater. Existing benthic Mg/Ca paleotemperature records do not display a cooling across the transition, possibly reflecting a saturation state effect on benthic foraminiferal Mg/Ca ratios at deep-water sites. Here we present data from exceptionally well preserved foraminifera deposited well above the calcite compensation depth that provide the first proxy evidence for an 2.5 °C ocean cooling associated with the ice growth. This permits interpretation of E-O 18O records without invoking Northern Hemisphere continental-scale ice. Article in Journal/Newspaper Antarc* Antarctic Cardiff University: ORCA (Online Research @ Cardiff) Antarctic Geology 36 3 251 |
institution |
Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
unknown |
topic |
GC Oceanography QE Geology |
spellingShingle |
GC Oceanography QE Geology Lear, Caroline Helen Bailey, Trevor R. Pearson, Paul Nicholas Coxall, Helen Kathrine Rosenthal, Yair Cooling and ice growth across the Eocene-Oligocene transition |
topic_facet |
GC Oceanography QE Geology |
description |
The Eocene-Oligocene (E-O) climate transition (ca. 34 Ma) marks a period of Antarctic ice growth and a major step from early Cenozoic greenhouse conditions toward today's glaciated climate state. The transition is represented by an increase in deep-sea benthic foraminiferal oxygen isotope (18O) values occurring in two main steps that reflect the temperature and 18O of seawater. Existing benthic Mg/Ca paleotemperature records do not display a cooling across the transition, possibly reflecting a saturation state effect on benthic foraminiferal Mg/Ca ratios at deep-water sites. Here we present data from exceptionally well preserved foraminifera deposited well above the calcite compensation depth that provide the first proxy evidence for an 2.5 °C ocean cooling associated with the ice growth. This permits interpretation of E-O 18O records without invoking Northern Hemisphere continental-scale ice. |
format |
Article in Journal/Newspaper |
author |
Lear, Caroline Helen Bailey, Trevor R. Pearson, Paul Nicholas Coxall, Helen Kathrine Rosenthal, Yair |
author_facet |
Lear, Caroline Helen Bailey, Trevor R. Pearson, Paul Nicholas Coxall, Helen Kathrine Rosenthal, Yair |
author_sort |
Lear, Caroline Helen |
title |
Cooling and ice growth across the Eocene-Oligocene transition |
title_short |
Cooling and ice growth across the Eocene-Oligocene transition |
title_full |
Cooling and ice growth across the Eocene-Oligocene transition |
title_fullStr |
Cooling and ice growth across the Eocene-Oligocene transition |
title_full_unstemmed |
Cooling and ice growth across the Eocene-Oligocene transition |
title_sort |
cooling and ice growth across the eocene-oligocene transition |
publisher |
Geological Society of America |
publishDate |
2008 |
url |
https://orca.cardiff.ac.uk/id/eprint/10101/ https://doi.org/10.1130/G24584A.1 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Lear, Caroline Helen https://orca.cardiff.ac.uk/view/cardiffauthors/A048848V.html orcid:0000-0002-7533-4430 orcid:0000-0002-7533-4430, Bailey, Trevor R., Pearson, Paul Nicholas https://orca.cardiff.ac.uk/view/cardiffauthors/A0179150.html orcid:0000-0003-4628-9818 orcid:0000-0003-4628-9818, Coxall, Helen Kathrine https://orca.cardiff.ac.uk/view/cardiffauthors/A007483I.html and Rosenthal, Yair 2008. Cooling and ice growth across the Eocene-Oligocene transition. Geology 36 (3) , pp. 251-254. 10.1130/G24584A.1 https://doi.org/10.1130/G24584A.1 doi:10.1130/G24584A.1 |
op_doi |
https://doi.org/10.1130/G24584A.1 |
container_title |
Geology |
container_volume |
36 |
container_issue |
3 |
container_start_page |
251 |
_version_ |
1766125826788556800 |