Patterns of millennial variability over the last 500 ka
Millennial variability is a robust feature of many paleoclimate records, at least throughout the last several glacial cycles. Here we use the mean signal from Antarctic climate events 1 to 4 to probe the EPICA Dome C temperature proxy reconstruction through the last 500 ka for similar millennial-sca...
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ftsouthampton:oai:eprints.soton.ac.uk:152403 2023-08-27T04:06:15+02:00 Patterns of millennial variability over the last 500 ka Siddall, M. Rohling, E.J. Blunier, T. Spahni, R. 2010-05-05 text https://eprints.soton.ac.uk/152403/ https://eprints.soton.ac.uk/152403/1/cp-6-295-2010.pdf en eng https://eprints.soton.ac.uk/152403/1/cp-6-295-2010.pdf Siddall, M., Rohling, E.J., Blunier, T. and Spahni, R. (2010) Patterns of millennial variability over the last 500 ka. [in special issue: Retrospective views on our planet's future – PAGES Open Science Meeting 2009] Climate of the Past, 6, 295-303. (doi:10.5194/cp-6-295-2010 <http://dx.doi.org/10.5194/cp-6-295-2010>). Article PeerReviewed 2010 ftsouthampton https://doi.org/10.5194/cp-6-295-2010 2023-08-03T22:19:34Z Millennial variability is a robust feature of many paleoclimate records, at least throughout the last several glacial cycles. Here we use the mean signal from Antarctic climate events 1 to 4 to probe the EPICA Dome C temperature proxy reconstruction through the last 500 ka for similar millennial-scale events. We find that clusters of millennial events occurred in a regular fashion over half of the time during this with a mean recurrence interval of 21 kyr. We find that there is no consistent link between ice-rafted debris deposition and millennial variability. Instead we speculate that changes in the zonality of atmospheric circulation over the North Atlantic form a viable alternative to freshwater release from icebergs as a trigger for millennial variability. We suggest that millennial changes in the zonality of atmospheric circulation over the North Atlantic are linked to precession via sea-ice feedbacks and that this relationship is modified by the presence of the large, Northern Hemisphere ice sheets during glacial periods. Article in Journal/Newspaper Antarc* Antarctic EPICA Iceberg* North Atlantic Sea ice University of Southampton: e-Prints Soton Antarctic Climate of the Past 6 3 295 303 |
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Open Polar |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
Millennial variability is a robust feature of many paleoclimate records, at least throughout the last several glacial cycles. Here we use the mean signal from Antarctic climate events 1 to 4 to probe the EPICA Dome C temperature proxy reconstruction through the last 500 ka for similar millennial-scale events. We find that clusters of millennial events occurred in a regular fashion over half of the time during this with a mean recurrence interval of 21 kyr. We find that there is no consistent link between ice-rafted debris deposition and millennial variability. Instead we speculate that changes in the zonality of atmospheric circulation over the North Atlantic form a viable alternative to freshwater release from icebergs as a trigger for millennial variability. We suggest that millennial changes in the zonality of atmospheric circulation over the North Atlantic are linked to precession via sea-ice feedbacks and that this relationship is modified by the presence of the large, Northern Hemisphere ice sheets during glacial periods. |
format |
Article in Journal/Newspaper |
author |
Siddall, M. Rohling, E.J. Blunier, T. Spahni, R. |
spellingShingle |
Siddall, M. Rohling, E.J. Blunier, T. Spahni, R. Patterns of millennial variability over the last 500 ka |
author_facet |
Siddall, M. Rohling, E.J. Blunier, T. Spahni, R. |
author_sort |
Siddall, M. |
title |
Patterns of millennial variability over the last 500 ka |
title_short |
Patterns of millennial variability over the last 500 ka |
title_full |
Patterns of millennial variability over the last 500 ka |
title_fullStr |
Patterns of millennial variability over the last 500 ka |
title_full_unstemmed |
Patterns of millennial variability over the last 500 ka |
title_sort |
patterns of millennial variability over the last 500 ka |
publishDate |
2010 |
url |
https://eprints.soton.ac.uk/152403/ https://eprints.soton.ac.uk/152403/1/cp-6-295-2010.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic EPICA Iceberg* North Atlantic Sea ice |
genre_facet |
Antarc* Antarctic EPICA Iceberg* North Atlantic Sea ice |
op_relation |
https://eprints.soton.ac.uk/152403/1/cp-6-295-2010.pdf Siddall, M., Rohling, E.J., Blunier, T. and Spahni, R. (2010) Patterns of millennial variability over the last 500 ka. [in special issue: Retrospective views on our planet's future – PAGES Open Science Meeting 2009] Climate of the Past, 6, 295-303. (doi:10.5194/cp-6-295-2010 <http://dx.doi.org/10.5194/cp-6-295-2010>). |
op_doi |
https://doi.org/10.5194/cp-6-295-2010 |
container_title |
Climate of the Past |
container_volume |
6 |
container_issue |
3 |
container_start_page |
295 |
op_container_end_page |
303 |
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1775347057729470464 |