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| Titel |
Patterns of millennial variability over the last 500 ka |
| VerfasserIn |
M. Siddall, E. J. Rohling, T. Blunier, R. Spahni |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 6, no. 3 ; Nr. 6, no. 3 (2010-05-05), S.295-303 |
| Datensatznummer |
250003543
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| Publikation (Nr.) |
 copernicus.org/cp-6-295-2010.pdf |
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| Zusammenfassung |
| 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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