Antarctic Ice Sheet dynamics during the Late Oligocene and Early Miocene: climatic conundrums revisited
The Oligocene-Miocene transition (OMT) is one of the most enigmatic periods (~23.3–22.9 Ma) in Earth’s Cenozoic climate history. It is characterised in deep-sea benthic foraminiferal (δ18O) records by an increase of up to +1‰ spanning a 200–300 kyr interval associated with global cooling and growth...
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ftcsic:oai:digital.csic.es:10261/359717 2024-06-23T07:47:50+00:00 Antarctic Ice Sheet dynamics during the Late Oligocene and Early Miocene: climatic conundrums revisited Naish, Timothy R. Duncan, B. Levy, Richard McKay, Robert M. Escutia, Carlota De Santis, Laura Colleoni, Florence Gasson, E. G. H. De Conto, Robert M. Wilson, Gary Ministerio de Ciencia e Innovación (España) European Commission Programma Nazionale di Ricerche in Antartide 2022 http://hdl.handle.net/10261/359717 unknown lsevier BV #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2017-89711-C2-1-P/ES/EVENTOS TECTONICOS Y OCEANOGRAFICOS EN EL DESARROLLO DE LA CORRIENTE CIRCUMPOLAR ANTARTICA (ACC) Y SU RELACION CON LA EVOLUCION PALEOCLIMATICA Y DEL CASQUETE DE HIELOS/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2017-89711-C2-2-P/ES/PRINCIPALES PROCESOS TECTONICOS INVOLUCRADOS EN EL INICIO Y EVOLUCION DE LA CORRIENTE CIRCUMPOLAR ANTARTICA (ACC): DESARROLLO DE MARGENES CONTINENTALES Y CUENCAS OCEANICAS/ https://doi.org/10.1016/B978-0-12-819109-5.00013-X Sí Antarctic Climate Evolution 8: 363-388 (2022) http://hdl.handle.net/10261/359717 none Antarctic Ice Sheet Foraminiferal Past Antarctic Ice Sheet Ice volume East Antarctic Ice Sheet West Antarctica Ice Sheet Oligocene Miocene Antarctic Ice sheet Climate Sea level capítulo de libro 2022 ftcsic https://doi.org/10.1016/B978-0-12-819109-5.00013-X 2024-06-11T23:56:09Z The Oligocene-Miocene transition (OMT) is one of the most enigmatic periods (~23.3–22.9 Ma) in Earth’s Cenozoic climate history. It is characterised in deep-sea benthic foraminiferal (δ18O) records by an increase of up to +1‰ spanning a 200–300 kyr interval associated with global cooling and growth in Antarctic ice volume to as much as 120% of present day (Mi-1 glaciation). The Mi-1 glaciation was then terminated by a −1.2‰, δ18O decrease that occurred in less than 100 kyrs, implying rapid Northern Hemisphere-style ice retreat, and potentially continental-scale deglaciation of Antarctica. Antarctic margin ocean drill core records and seismic reflection profiles display evidence of ice-proximal glacimarine deposition or glacimarine erosion, and imply continent-wide advance of the ice sheet terminus into the marine realm during the Mi-1 glaciation. This major transient glaciation occurred within a ~400 kyr-duration eccentricity cycle and appears to be coupled with an orbitally-paced perturbation of the carbon cycle. Atmospheric CO2 reconstructed from geological proxy records imply a long-term decrease during the Oligocene from about 500 to less than 300 ppm. Atmospheric CO2 declining below a threshold (~400 ppm), together with an extreme cold orbital configuration, enabled widespread seasonal sea-ice formation and the development of extensive marine-based ice margins around Antarctica. Atmospheric CO2 concentration appears to rebound rapidly following the Mi-1 glaciation, with some proxy estimates as high as 1000 ppm by the earliest Miocene. The OMT challenges our current understanding of orbitally-paced, ocean-atmosphere carbon exchange and associated feedbacks in the climate system. Prior to the OMT, between ~27 and 24 Ma, a trend towards lower δ18O values suggested an extensive period of global warmth, polar ice volume decrease and global sea-level rise. This is in contrast with widespread evidence from Ross Sea drill cores that show cooling of near surface ocean and land temperatures, and glacial advance ... Book Part Antarc* Antarctic Antarctica Ice Sheet Ross Sea Sea ice West Antarctica Digital.CSIC (Spanish National Research Council) Antarctic East Antarctic Ice Sheet Ross Sea West Antarctica 363 387 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Antarctic Ice Sheet Foraminiferal Past Antarctic Ice Sheet Ice volume East Antarctic Ice Sheet West Antarctica Ice Sheet Oligocene Miocene Antarctic Ice sheet Climate Sea level |
spellingShingle |
Antarctic Ice Sheet Foraminiferal Past Antarctic Ice Sheet Ice volume East Antarctic Ice Sheet West Antarctica Ice Sheet Oligocene Miocene Antarctic Ice sheet Climate Sea level Naish, Timothy R. Duncan, B. Levy, Richard McKay, Robert M. Escutia, Carlota De Santis, Laura Colleoni, Florence Gasson, E. G. H. De Conto, Robert M. Wilson, Gary Antarctic Ice Sheet dynamics during the Late Oligocene and Early Miocene: climatic conundrums revisited |
topic_facet |
Antarctic Ice Sheet Foraminiferal Past Antarctic Ice Sheet Ice volume East Antarctic Ice Sheet West Antarctica Ice Sheet Oligocene Miocene Antarctic Ice sheet Climate Sea level |
description |
The Oligocene-Miocene transition (OMT) is one of the most enigmatic periods (~23.3–22.9 Ma) in Earth’s Cenozoic climate history. It is characterised in deep-sea benthic foraminiferal (δ18O) records by an increase of up to +1‰ spanning a 200–300 kyr interval associated with global cooling and growth in Antarctic ice volume to as much as 120% of present day (Mi-1 glaciation). The Mi-1 glaciation was then terminated by a −1.2‰, δ18O decrease that occurred in less than 100 kyrs, implying rapid Northern Hemisphere-style ice retreat, and potentially continental-scale deglaciation of Antarctica. Antarctic margin ocean drill core records and seismic reflection profiles display evidence of ice-proximal glacimarine deposition or glacimarine erosion, and imply continent-wide advance of the ice sheet terminus into the marine realm during the Mi-1 glaciation. This major transient glaciation occurred within a ~400 kyr-duration eccentricity cycle and appears to be coupled with an orbitally-paced perturbation of the carbon cycle. Atmospheric CO2 reconstructed from geological proxy records imply a long-term decrease during the Oligocene from about 500 to less than 300 ppm. Atmospheric CO2 declining below a threshold (~400 ppm), together with an extreme cold orbital configuration, enabled widespread seasonal sea-ice formation and the development of extensive marine-based ice margins around Antarctica. Atmospheric CO2 concentration appears to rebound rapidly following the Mi-1 glaciation, with some proxy estimates as high as 1000 ppm by the earliest Miocene. The OMT challenges our current understanding of orbitally-paced, ocean-atmosphere carbon exchange and associated feedbacks in the climate system. Prior to the OMT, between ~27 and 24 Ma, a trend towards lower δ18O values suggested an extensive period of global warmth, polar ice volume decrease and global sea-level rise. This is in contrast with widespread evidence from Ross Sea drill cores that show cooling of near surface ocean and land temperatures, and glacial advance ... |
author2 |
Ministerio de Ciencia e Innovación (España) European Commission Programma Nazionale di Ricerche in Antartide |
format |
Book Part |
author |
Naish, Timothy R. Duncan, B. Levy, Richard McKay, Robert M. Escutia, Carlota De Santis, Laura Colleoni, Florence Gasson, E. G. H. De Conto, Robert M. Wilson, Gary |
author_facet |
Naish, Timothy R. Duncan, B. Levy, Richard McKay, Robert M. Escutia, Carlota De Santis, Laura Colleoni, Florence Gasson, E. G. H. De Conto, Robert M. Wilson, Gary |
author_sort |
Naish, Timothy R. |
title |
Antarctic Ice Sheet dynamics during the Late Oligocene and Early Miocene: climatic conundrums revisited |
title_short |
Antarctic Ice Sheet dynamics during the Late Oligocene and Early Miocene: climatic conundrums revisited |
title_full |
Antarctic Ice Sheet dynamics during the Late Oligocene and Early Miocene: climatic conundrums revisited |
title_fullStr |
Antarctic Ice Sheet dynamics during the Late Oligocene and Early Miocene: climatic conundrums revisited |
title_full_unstemmed |
Antarctic Ice Sheet dynamics during the Late Oligocene and Early Miocene: climatic conundrums revisited |
title_sort |
antarctic ice sheet dynamics during the late oligocene and early miocene: climatic conundrums revisited |
publisher |
lsevier BV |
publishDate |
2022 |
url |
http://hdl.handle.net/10261/359717 |
geographic |
Antarctic East Antarctic Ice Sheet Ross Sea West Antarctica |
geographic_facet |
Antarctic East Antarctic Ice Sheet Ross Sea West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea Sea ice West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea Sea ice West Antarctica |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2017-89711-C2-1-P/ES/EVENTOS TECTONICOS Y OCEANOGRAFICOS EN EL DESARROLLO DE LA CORRIENTE CIRCUMPOLAR ANTARTICA (ACC) Y SU RELACION CON LA EVOLUCION PALEOCLIMATICA Y DEL CASQUETE DE HIELOS/ info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2017-89711-C2-2-P/ES/PRINCIPALES PROCESOS TECTONICOS INVOLUCRADOS EN EL INICIO Y EVOLUCION DE LA CORRIENTE CIRCUMPOLAR ANTARTICA (ACC): DESARROLLO DE MARGENES CONTINENTALES Y CUENCAS OCEANICAS/ https://doi.org/10.1016/B978-0-12-819109-5.00013-X Sí Antarctic Climate Evolution 8: 363-388 (2022) http://hdl.handle.net/10261/359717 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/B978-0-12-819109-5.00013-X |
container_start_page |
363 |
op_container_end_page |
387 |
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1802638017381269504 |