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One-to-one coupling of glacial climate variability in Greenland and Antarctica

C. Barbante 1, 2, 3 Jean-Marc Barnola 3, 4 Silvia Becagli 3, 5 J. Beer 3, 6 M. Bigler 3, 7 Claude Boutron 3, 4 T. Blunier 3, 7 E. Castellano 3, 5 O. Cattani 3, 8 Jérome Chappellaz 3, 4 D. Dahl-Jensen 3 Maxime Debret 4 Barbara Delmonte 9 D. Dick S. Falourd 3, 8 S. Faria 3 U. Federer 3 Hubertus Fischer 10 J. Freitag 10 A. Frenzel 10 D. Fritzsche 10 F. Fundel 10 Paolo Gabrielli 1, 4 V. Gaspari 9 R. Gersonde 10 W. Graf 11 D. Grigoriev 12 I. Hamann 10 M. Hansson 13 G. Hoffmann 8 M. A. Hutterli 7, 14 P. Huybrechts 10, 15 E. Isaksson 16 S. Johnsen 7 Jean Jouzel 8 M. Kaczmarska 16 T. Karlin 13 P. Kaufmann 7 S. Kipfstuhl 10 M. Kohno 10 F. Lambert 7 Anja Lambrecht 10 Astrid Lambrecht 10 A. Landais 8 G. Lawer 10 M. Leuenberger 7 G. Littot 14 L. Loulergue 4 D. Lüthi 7 V. Maggi 9 F. Marino 9 Valérie Masson-Delmotte 8 H. Meyer 10 H. Miller 10 R. Mulvaney 14 B. Narcisi 17 J. Oerlemans 18 H. Oerter 10 F. Parrenin 4 Jean-Robert Petit 4 G. Raisbeck 19 D. Raynaud 4 R. Röthlisberger 14 U. Ruth 10 O. Rybak 10 M. Severi 5 J. Schmitt 10 J. Schwander 7 U. Siegenthaler 7 M. L. Siggaard-Andersen 3 R. Spahni 7 J. P. Steffensen 3 B. Stenni 20 T. F. Stocker 7 J. L. Tison 21 R. Traversi 5 R. Udisti 5 F. Valero-Delgado 10 M. R. van den Broeke 18 R. S. W. Wan de Wal 18 D. Wagenbach 22 A. Wegner 10 K. Weiler 10 F. Wilhelms 10 J. G. Winther 16 E. Wolff 14
Abstract : Precise knowledge of the phase relationship between climate changes in the two hemispheres is a key for understanding the Earth's climate dynamics. For the last glacial period, ice core studies1, 2 have revealed strong coupling of the largest millennial-scale warm events in Antarctica with the longest Dansgaard–Oeschger events in Greenland3, 4, 5 through the Atlantic meridional overturning circulation6, 7, 8. It has been unclear, however, whether the shorter Dansgaard–Oeschger events have counterparts in the shorter and less prominent Antarctic temperature variations, and whether these events are linked by the same mechanism. Here we present a glacial climate record derived from an ice core from Dronning Maud Land, Antarctica, which represents South Atlantic climate at a resolution comparable with the Greenland ice core records. After methane synchronization with an ice core from North Greenland9, the oxygen isotope record from the Dronning Maud Land ice core shows a one-to-one coupling between all Antarctic warm events and Greenland Dansgaard–Oeschger events by the bipolar seesaw6. The amplitude of the Antarctic warm events is found to be linearly dependent on the duration of the concurrent stadial in the North, suggesting that they all result from a similar reduction in the meridional overturning circulation.
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C. Barbante, Jean-Marc Barnola, Silvia Becagli, J. Beer, M. Bigler, et al.. One-to-one coupling of glacial climate variability in Greenland and Antarctica. Nature, Nature Publishing Group, 2006, 444, pp.195 à 198. ⟨10.1038/nature05301⟩. ⟨insu-00375263⟩

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