Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene
Stable isotope records of benthic foraminifera from ODP Site 1264 in the southeastern Atlantic Ocean are presented which resolve the latest Oligocene to early Miocene (~24–19 Ma) climate changes at high temporal resolution (<3 kyr). Using an inverse modelling technique, we decomposed the oxygen i...
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ftdoajarticles:oai:doaj.org/article:ecc15fea522f4556b5324ac7c1db8a7d 2023-05-15T13:40:58+02:00 Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene D. Liebrand L. J. Lourens D. A. Hodell B. de Boer R. S. W. van de Wal H. Pälike 2011-08-01T00:00:00Z https://doi.org/10.5194/cp-7-869-2011 https://doaj.org/article/ecc15fea522f4556b5324ac7c1db8a7d EN eng Copernicus Publications http://www.clim-past.net/7/869/2011/cp-7-869-2011.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-7-869-2011 1814-9324 1814-9332 https://doaj.org/article/ecc15fea522f4556b5324ac7c1db8a7d Climate of the Past, Vol 7, Iss 3, Pp 869-880 (2011) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2011 ftdoajarticles https://doi.org/10.5194/cp-7-869-2011 2022-12-31T09:29:24Z Stable isotope records of benthic foraminifera from ODP Site 1264 in the southeastern Atlantic Ocean are presented which resolve the latest Oligocene to early Miocene (~24–19 Ma) climate changes at high temporal resolution (<3 kyr). Using an inverse modelling technique, we decomposed the oxygen isotope record into temperature and ice volume and found that the Antarctic ice sheet expanded episodically during the declining phase of the long-term (~400 kyr) eccentricity cycle and subsequent low short-term (~100 kyr) eccentricity cycle. The largest glaciations are separated by multiple long-term eccentricity cycles, indicating the involvement of a non-linear response mechanism. Our modelling results suggest that during the largest (Mi-1) event, Antarctic ice sheet volume expanded up to its present-day configuration. In addition, we found that distinct ~100 kyr variability occurs during the termination phases of the major Antarctic glaciations, suggesting that climate and ice-sheet response was more susceptible to short-term eccentricity forcing at these times. During two of these termination-phases, δ 18 O bottom water gradients in the Atlantic ceased to exist, indicating a direct link between global climate, enhanced ice-sheet instability and major oceanographic reorganisations. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Climate of the Past 7 3 869 880 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 D. Liebrand L. J. Lourens D. A. Hodell B. de Boer R. S. W. van de Wal H. Pälike Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Stable isotope records of benthic foraminifera from ODP Site 1264 in the southeastern Atlantic Ocean are presented which resolve the latest Oligocene to early Miocene (~24–19 Ma) climate changes at high temporal resolution (<3 kyr). Using an inverse modelling technique, we decomposed the oxygen isotope record into temperature and ice volume and found that the Antarctic ice sheet expanded episodically during the declining phase of the long-term (~400 kyr) eccentricity cycle and subsequent low short-term (~100 kyr) eccentricity cycle. The largest glaciations are separated by multiple long-term eccentricity cycles, indicating the involvement of a non-linear response mechanism. Our modelling results suggest that during the largest (Mi-1) event, Antarctic ice sheet volume expanded up to its present-day configuration. In addition, we found that distinct ~100 kyr variability occurs during the termination phases of the major Antarctic glaciations, suggesting that climate and ice-sheet response was more susceptible to short-term eccentricity forcing at these times. During two of these termination-phases, δ 18 O bottom water gradients in the Atlantic ceased to exist, indicating a direct link between global climate, enhanced ice-sheet instability and major oceanographic reorganisations. |
format |
Article in Journal/Newspaper |
author |
D. Liebrand L. J. Lourens D. A. Hodell B. de Boer R. S. W. van de Wal H. Pälike |
author_facet |
D. Liebrand L. J. Lourens D. A. Hodell B. de Boer R. S. W. van de Wal H. Pälike |
author_sort |
D. Liebrand |
title |
Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene |
title_short |
Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene |
title_full |
Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene |
title_fullStr |
Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene |
title_full_unstemmed |
Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene |
title_sort |
antarctic ice sheet and oceanographic response to eccentricity forcing during the early miocene |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/cp-7-869-2011 https://doaj.org/article/ecc15fea522f4556b5324ac7c1db8a7d |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Climate of the Past, Vol 7, Iss 3, Pp 869-880 (2011) |
op_relation |
http://www.clim-past.net/7/869/2011/cp-7-869-2011.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-7-869-2011 1814-9324 1814-9332 https://doaj.org/article/ecc15fea522f4556b5324ac7c1db8a7d |
op_doi |
https://doi.org/10.5194/cp-7-869-2011 |
container_title |
Climate of the Past |
container_volume |
7 |
container_issue |
3 |
container_start_page |
869 |
op_container_end_page |
880 |
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1766143836654927872 |