Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling
The onset of sustained Antarctic glaciation across the Eocene-Oligocene transition (EOT) marks a pivotal change in Earth's climate, but our understanding of this event, particularly the role of the carbon cycle, is limited. To help address this gap we present the following paleoceanographic pro...
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American Geophysical Union
2011
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:10119 2023-05-15T13:37:52+02:00 Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling Coxall, Helen Kathrine Wilson, Paul A. 2011 application/pdf https://orca.cardiff.ac.uk/id/eprint/10119/ https://doi.org/10.1029/2010PA002021 https://orca.cardiff.ac.uk/id/eprint/10119/1/Coxall_and_Wilson_2011.pdf en eng American Geophysical Union https://orca.cardiff.ac.uk/id/eprint/10119/1/Coxall_and_Wilson_2011.pdf Coxall, Helen Kathrine and Wilson, Paul A. 2011. Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling. Paleoceanography 26 (2) , PA2221. 10.1029/2010PA002021 https://doi.org/10.1029/2010PA002021 file https://orca.cardiff.ac.uk/10119/1/Coxall_and_Wilson_2011.pdf doi:10.1029/2010PA002021 GC Oceanography QE Geology Article PeerReviewed 2011 ftunivcardiff https://doi.org/10.1029/2010PA002021 2022-09-25T20:17:28Z The onset of sustained Antarctic glaciation across the Eocene-Oligocene transition (EOT) marks a pivotal change in Earth's climate, but our understanding of this event, particularly the role of the carbon cycle, is limited. To help address this gap we present the following paleoceanographic proxy records from Ocean Drilling Program Site 1218 in the eastern equatorial Pacific (EEP): (1) stable isotope (δ18O and δ13C) records generated in epifaunal benthic foraminifera (Cibicidoides spp.) to improve (double the resolution) the previously published records; (2) δ18O and δ13C records measured on Oridorsalis umbonatus, a shallow infaunal species; and (3) a record of benthic foraminifera accumulation rate (BFAR). Our new isotope data sets confirm the existence at Site 1218 of a two-step δ18O increase. They also lend support to the hypothesized existence of a late Eocene transient δ18O increase and early Oligocene Oi-1a and Oi-1b glacial maxima. Our record of BFAR indicates a transient (∼500 kyr) twofold to threefold peak relative to baseline Oligocene values associated with the onset of Antarctic glaciation that we attribute to enhanced biological export production in the EEP. This takes the same general form as the history of opal accumulation in the Southern Ocean, suggesting strong high-to-low-latitude oceanic coupling. These findings appear to lend support to the idea that the EOT δ13C excursion is traceable to increased organic carbon (Corg) burial. Paradoxically, early Oligocene sediments in the EEP are extremely Corg-poor, and proxy records of atmospheric pCO2 indicate a transient increase associated with the EOT. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean Cardiff University: ORCA (Online Research @ Cardiff) Antarctic Pacific Southern Ocean Paleoceanography 26 2 n/a n/a |
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Open Polar |
collection |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
topic |
GC Oceanography QE Geology |
spellingShingle |
GC Oceanography QE Geology Coxall, Helen Kathrine Wilson, Paul A. Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling |
topic_facet |
GC Oceanography QE Geology |
description |
The onset of sustained Antarctic glaciation across the Eocene-Oligocene transition (EOT) marks a pivotal change in Earth's climate, but our understanding of this event, particularly the role of the carbon cycle, is limited. To help address this gap we present the following paleoceanographic proxy records from Ocean Drilling Program Site 1218 in the eastern equatorial Pacific (EEP): (1) stable isotope (δ18O and δ13C) records generated in epifaunal benthic foraminifera (Cibicidoides spp.) to improve (double the resolution) the previously published records; (2) δ18O and δ13C records measured on Oridorsalis umbonatus, a shallow infaunal species; and (3) a record of benthic foraminifera accumulation rate (BFAR). Our new isotope data sets confirm the existence at Site 1218 of a two-step δ18O increase. They also lend support to the hypothesized existence of a late Eocene transient δ18O increase and early Oligocene Oi-1a and Oi-1b glacial maxima. Our record of BFAR indicates a transient (∼500 kyr) twofold to threefold peak relative to baseline Oligocene values associated with the onset of Antarctic glaciation that we attribute to enhanced biological export production in the EEP. This takes the same general form as the history of opal accumulation in the Southern Ocean, suggesting strong high-to-low-latitude oceanic coupling. These findings appear to lend support to the idea that the EOT δ13C excursion is traceable to increased organic carbon (Corg) burial. Paradoxically, early Oligocene sediments in the EEP are extremely Corg-poor, and proxy records of atmospheric pCO2 indicate a transient increase associated with the EOT. |
format |
Article in Journal/Newspaper |
author |
Coxall, Helen Kathrine Wilson, Paul A. |
author_facet |
Coxall, Helen Kathrine Wilson, Paul A. |
author_sort |
Coxall, Helen Kathrine |
title |
Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling |
title_short |
Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling |
title_full |
Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling |
title_fullStr |
Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling |
title_full_unstemmed |
Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling |
title_sort |
early oligocene glaciation and productivity in the eastern equatorial pacific: insights into global carbon cycling |
publisher |
American Geophysical Union |
publishDate |
2011 |
url |
https://orca.cardiff.ac.uk/id/eprint/10119/ https://doi.org/10.1029/2010PA002021 https://orca.cardiff.ac.uk/id/eprint/10119/1/Coxall_and_Wilson_2011.pdf |
geographic |
Antarctic Pacific Southern Ocean |
geographic_facet |
Antarctic Pacific Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/10119/1/Coxall_and_Wilson_2011.pdf Coxall, Helen Kathrine and Wilson, Paul A. 2011. Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling. Paleoceanography 26 (2) , PA2221. 10.1029/2010PA002021 https://doi.org/10.1029/2010PA002021 file https://orca.cardiff.ac.uk/10119/1/Coxall_and_Wilson_2011.pdf doi:10.1029/2010PA002021 |
op_doi |
https://doi.org/10.1029/2010PA002021 |
container_title |
Paleoceanography |
container_volume |
26 |
container_issue |
2 |
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n/a |
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n/a |
_version_ |
1766098525680041984 |