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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Language: | English |
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fttriple:oai:gotriple.eu:CtrPnCezcMnSmIiFh1jrW 2023-05-15T14:02:27+02:00 Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene Liebrand, D. Lourens, L. J. Hodell, D. A. Boer, B. Wal, R. S. W. Pälike, H. 2018-09-27 https://doi.org/10.5194/cp-7-869-2011 https://cp.copernicus.org/articles/7/869/2011/ en eng Copernicus Publications doi:10.5194/cp-7-869-2011 10670/1.me4l26 1814-9324 1814-9332 https://cp.copernicus.org/articles/7/869/2011/ other undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Other https://vocabularies.coar-repositories.org/resource_types/c_1843/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-7-869-2011 2023-01-22T17:39:22Z 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, δ18O 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 Unknown Antarctic The Antarctic Climate of the Past 7 3 869 880 |
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geo envir Liebrand, D. Lourens, L. J. Hodell, D. A. Boer, B. Wal, R. S. W. Pälike, H. Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene |
topic_facet |
geo envir |
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, δ18O 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 |
Liebrand, D. Lourens, L. J. Hodell, D. A. Boer, B. Wal, R. S. W. Pälike, H. |
author_facet |
Liebrand, D. Lourens, L. J. Hodell, D. A. Boer, B. Wal, R. S. W. Pälike, H. |
author_sort |
Liebrand, D. |
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 |
2018 |
url |
https://doi.org/10.5194/cp-7-869-2011 https://cp.copernicus.org/articles/7/869/2011/ |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-7-869-2011 10670/1.me4l26 1814-9324 1814-9332 https://cp.copernicus.org/articles/7/869/2011/ |
op_rights |
other undefined |
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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1766272730020184064 |