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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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/79256 2023-05-15T13:56:44+02:00 Patterns of millennial variability over the last 500 ka Siddall, M Rohling, Eelco Blunier, T. Spahni, R. 2015-12-13T22:43:35Z http://hdl.handle.net/1885/79256 unknown Copernicus GmbH 1814-9324 http://hdl.handle.net/1885/79256 Climate of the Past Journal article 2015 ftanucanberra 2015-12-21T23:51:54Z 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 Australian National University: ANU Digital Collections Antarctic |
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Open Polar |
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Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
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, Eelco Blunier, T. Spahni, R. |
spellingShingle |
Siddall, M Rohling, Eelco Blunier, T. Spahni, R. Patterns of millennial variability over the last 500 ka |
author_facet |
Siddall, M Rohling, Eelco 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 |
publisher |
Copernicus GmbH |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/79256 |
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_source |
Climate of the Past |
op_relation |
1814-9324 http://hdl.handle.net/1885/79256 |
_version_ |
1766264318485069824 |