Patterns of millennial variability over the last 500 ka
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-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.
295-303
Siddall, M.
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Rohling, E.J.
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Blunier, T.
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Spahni, R.
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5 May 2010
Siddall, M.
9c045dd5-498b-488b-9c67-23e24d90ebcc
Rohling, E.J.
a2a27ef2-fcce-4c71-907b-e692b5ecc685
Blunier, T.
d2c7840f-7bfe-4eb8-9da3-2ae51f31f1b8
Spahni, R.
c7abc3bc-cdb5-4a26-9656-33a68bfd4b7c
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, .
(doi:10.5194/cp-6-295-2010).
Abstract
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.
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Published date: 5 May 2010
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Local EPrints ID: 152403
URI: http://eprints.soton.ac.uk/id/eprint/152403
ISSN: 1814-9332
PURE UUID: 29ba77c3-969b-47c2-8dd6-8da93c663fe8
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Date deposited: 14 May 2010 10:28
Last modified: 14 Mar 2024 02:37
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Author:
M. Siddall
Author:
T. Blunier
Author:
R. Spahni
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