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...
Published in: | Climate of the Past |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2011
|
Subjects: | |
Online Access: | https://eprints.soton.ac.uk/201427/ https://eprints.soton.ac.uk/201427/1/cp-7-869-2011-1.pdf |
id |
ftsouthampton:oai:eprints.soton.ac.uk:201427 |
---|---|
record_format |
openpolar |
spelling |
ftsouthampton:oai:eprints.soton.ac.uk:201427 2023-08-27T04:05:12+02:00 Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene Liebrand, Diederik Lourens, L.J. Hodell, D.A. de Boer, B. van de Wal, R.S.W. Pälike, H. 2011 text https://eprints.soton.ac.uk/201427/ https://eprints.soton.ac.uk/201427/1/cp-7-869-2011-1.pdf en eng https://eprints.soton.ac.uk/201427/1/cp-7-869-2011-1.pdf Liebrand, Diederik, Lourens, L.J., Hodell, D.A., de Boer, B., van de Wal, R.S.W. and Pälike, H. (2011) Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene. Climate of the Past, 7 (3), 869-880. (doi:10.5194/cp-7-869-2011 <http://dx.doi.org/10.5194/cp-7-869-2011>). Article PeerReviewed 2011 ftsouthampton https://doi.org/10.5194/cp-7-869-2011 2023-08-03T22:19:43Z 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, ?18O 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 University of Southampton: e-Prints Soton Antarctic The Antarctic Climate of the Past 7 3 869 880 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
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, ?18O 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, Diederik Lourens, L.J. Hodell, D.A. de Boer, B. van de Wal, R.S.W. Pälike, H. |
spellingShingle |
Liebrand, Diederik Lourens, L.J. Hodell, D.A. de Boer, B. van de Wal, R.S.W. Pälike, H. Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene |
author_facet |
Liebrand, Diederik Lourens, L.J. Hodell, D.A. de Boer, B. van de Wal, R.S.W. Pälike, H. |
author_sort |
Liebrand, Diederik |
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 |
publishDate |
2011 |
url |
https://eprints.soton.ac.uk/201427/ https://eprints.soton.ac.uk/201427/1/cp-7-869-2011-1.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
https://eprints.soton.ac.uk/201427/1/cp-7-869-2011-1.pdf Liebrand, Diederik, Lourens, L.J., Hodell, D.A., de Boer, B., van de Wal, R.S.W. and Pälike, H. (2011) Antarctic ice sheet and oceanographic response to eccentricity forcing during the early Miocene. Climate of the Past, 7 (3), 869-880. (doi:10.5194/cp-7-869-2011 <http://dx.doi.org/10.5194/cp-7-869-2011>). |
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 |
_version_ |
1775356810129047552 |