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| Titel |
The last deglaciation: timing the bipolar seesaw |
| VerfasserIn |
J. B. Pedro, T. D. Ommen, S. O. Rasmussen, V. I. Morgan, J. Chappellaz, A. D. Moy, V. Masson-Delmotte, M. Delmotte |
| 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 ; 7, no. 2 ; Nr. 7, no. 2 (2011-06-24), S.671-683 |
| Datensatznummer |
250004524
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| Publikation (Nr.) |
 copernicus.org/cp-7-671-2011.pdf |
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| Zusammenfassung |
| Precise information on the relative timing of north-south climate
variations is a key to resolving questions concerning the mechanisms
that force and couple climate changes between the hemispheres. We
present a new composite record made from five well-resolved
Antarctic ice core records that robustly represents the timing of
regional Antarctic climate change during the last deglaciation.
Using fast variations in global methane gas concentrations as time
markers, the Antarctic composite is directly compared to Greenland
ice core records, allowing a detailed mapping of the
inter-hemispheric sequence of climate changes. Consistent with prior
studies the synchronized records show that warming (and cooling)
trends in Antarctica closely match cold (and warm) periods in
Greenland on millennial timescales. For the first time, we also
identify a sub-millennial component to the inter-hemispheric
coupling. Within the Antarctic Cold Reversal the strongest Antarctic
cooling occurs during the pronounced northern warmth of the
Bølling. Warming then resumes in Antarctica, potentially as early
as the Intra-Allerød Cold Period, but with dating uncertainty
that could place it as late as the onset of the Younger Dryas
stadial. There is little-to-no time lag between climate transitions
in Greenland and opposing changes in Antarctica. Our results lend
support to fast acting inter-hemispheric coupling mechanisms,
including recently proposed bipolar atmospheric teleconnections
and/or rapid bipolar ocean teleconnections. |
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