Resolving Apparent Conflicts between Oceanographic and Antarctic Climate Records and Evidence for a Decrease in pCO2 during the Oligocene through Early Miocene (34–16 Ma)
An apparent mismatch between published oxygen isotopic data and other paleoclimate proxies for the span from 26–16 Ma is resolved by calibration against global sea-level estimates obtained from backstripping continental margin stratigraphy. Ice-volume estimates from calibrated oxygen isotope data co...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8GM8JBQ 2023-05-15T13:50:01+02:00 Resolving Apparent Conflicts between Oceanographic and Antarctic Climate Records and Evidence for a Decrease in pCO2 during the Oligocene through Early Miocene (34–16 Ma) Pekar, Stephen F. Christie-Blick, Nicholas 2007 https://doi.org/10.7916/D8GM8JBQ English eng https://doi.org/10.7916/D8GM8JBQ Paleoclimatology Geology Geochemistry Articles 2007 ftcolumbiauniv https://doi.org/10.7916/D8GM8JBQ 2019-04-04T08:10:00Z An apparent mismatch between published oxygen isotopic data and other paleoclimate proxies for the span from 26–16 Ma is resolved by calibration against global sea-level estimates obtained from backstripping continental margin stratigraphy. Ice-volume estimates from calibrated oxygen isotope data compare favorably with stratigraphic and palynological data from Antarctica, and with estimates of atmospheric pCO2 throughout the Oligocene to early Miocene (34–16 Ma). Isotopic evidence for an East Antarctic Ice Sheet (EAIS) as much as 30% larger than its present-day volume at glacial maxima during that span is consistent with seismic reflection and stratigraphic evidence for an ice sheet covering much of the Antarctic continental shelf at the same glacial maxima. Palynological data suggest long-term cooling during the Oligocene, with cold near-tundra environments developing along the coast at glacial minima no later than the late Oligocene. A possible mechanism for this long-term cooling is a decrease in atmospheric pCO2 from the middle Eocene to Oligocene, reaching near pre-industrial levels by the latest Oligocene, and remaining at those depressed levels throughout the Miocene. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Tundra Columbia University: Academic Commons Antarctic The Antarctic East Antarctic Ice Sheet |
institution |
Open Polar |
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Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Paleoclimatology Geology Geochemistry |
spellingShingle |
Paleoclimatology Geology Geochemistry Pekar, Stephen F. Christie-Blick, Nicholas Resolving Apparent Conflicts between Oceanographic and Antarctic Climate Records and Evidence for a Decrease in pCO2 during the Oligocene through Early Miocene (34–16 Ma) |
topic_facet |
Paleoclimatology Geology Geochemistry |
description |
An apparent mismatch between published oxygen isotopic data and other paleoclimate proxies for the span from 26–16 Ma is resolved by calibration against global sea-level estimates obtained from backstripping continental margin stratigraphy. Ice-volume estimates from calibrated oxygen isotope data compare favorably with stratigraphic and palynological data from Antarctica, and with estimates of atmospheric pCO2 throughout the Oligocene to early Miocene (34–16 Ma). Isotopic evidence for an East Antarctic Ice Sheet (EAIS) as much as 30% larger than its present-day volume at glacial maxima during that span is consistent with seismic reflection and stratigraphic evidence for an ice sheet covering much of the Antarctic continental shelf at the same glacial maxima. Palynological data suggest long-term cooling during the Oligocene, with cold near-tundra environments developing along the coast at glacial minima no later than the late Oligocene. A possible mechanism for this long-term cooling is a decrease in atmospheric pCO2 from the middle Eocene to Oligocene, reaching near pre-industrial levels by the latest Oligocene, and remaining at those depressed levels throughout the Miocene. |
format |
Article in Journal/Newspaper |
author |
Pekar, Stephen F. Christie-Blick, Nicholas |
author_facet |
Pekar, Stephen F. Christie-Blick, Nicholas |
author_sort |
Pekar, Stephen F. |
title |
Resolving Apparent Conflicts between Oceanographic and Antarctic Climate Records and Evidence for a Decrease in pCO2 during the Oligocene through Early Miocene (34–16 Ma) |
title_short |
Resolving Apparent Conflicts between Oceanographic and Antarctic Climate Records and Evidence for a Decrease in pCO2 during the Oligocene through Early Miocene (34–16 Ma) |
title_full |
Resolving Apparent Conflicts between Oceanographic and Antarctic Climate Records and Evidence for a Decrease in pCO2 during the Oligocene through Early Miocene (34–16 Ma) |
title_fullStr |
Resolving Apparent Conflicts between Oceanographic and Antarctic Climate Records and Evidence for a Decrease in pCO2 during the Oligocene through Early Miocene (34–16 Ma) |
title_full_unstemmed |
Resolving Apparent Conflicts between Oceanographic and Antarctic Climate Records and Evidence for a Decrease in pCO2 during the Oligocene through Early Miocene (34–16 Ma) |
title_sort |
resolving apparent conflicts between oceanographic and antarctic climate records and evidence for a decrease in pco2 during the oligocene through early miocene (34–16 ma) |
publishDate |
2007 |
url |
https://doi.org/10.7916/D8GM8JBQ |
geographic |
Antarctic The Antarctic East Antarctic Ice Sheet |
geographic_facet |
Antarctic The Antarctic East Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica Ice Sheet Tundra |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Tundra |
op_relation |
https://doi.org/10.7916/D8GM8JBQ |
op_doi |
https://doi.org/10.7916/D8GM8JBQ |
_version_ |
1766252754983976960 |