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Expression of the bipolar see-saw in Antarctic climate records during the last deglaciation

B. Stenni 1 D. Buiron 2 M. Frezzotti 3 S. Albani 4 C. Barbante 5, 6 E. Bard 7 J.M. Barnola 8 M. Baroni 7 M. Baumgartner 9 M. Bonazza 1 E. Capron 10 E. Castellano 11 J. Chappellaz 2 B. Delmonte S. Falourd 10, 12 L. Genoni 1 P. Iacumin 13 Jean Jouzel 10, 12 S. Kipfstuhl 14 A. Landais 10, 12 B. Lemieux-Dudon 8 V. Maggi Valérie Masson-Delmotte 10, 12 C. Mazzola B. Minster 10, 12 M. Montagnat 15 R. Mulvaney 16 B. Narcisi 3 H. Oerter 14 F. Parrenin 8 J.R. Petit 2 C. Ritz 15 C. Scarchilli 3 A. Schilt 9 S. Schupbach 9 J. Schwander 9 E. Selmo 13 M. Severi 11 T. F. Stocker 9 R. Udisti 11
Abstract : Ice-core records of climate from Greenland and Antarctica show asynchronous temperature variations on millennial timescales during the last glacial period. The warming during the transition from glacial to interglacial conditions was markedly different between the hemispheres, a pattern attributed to the thermal bipolar see-saw. However, a record from the Ross Sea sector of East Antarctica has been suggested to be synchronous with Northern Hemisphere climate change. Here we present a temperature record from the Talos Dome ice core, also located in the Ross Sea sector. We compare our record with ice-core analyses from Greenland, based on methane synchronization, and find clearly asynchronous temperature changes during the deglaciation. We also find distinct differences in Antarctic records, pointing to differences in the climate evolution of the Indo-Pacific and Atlantic sectors of Antarctica. In the Atlantic sector, we find that the rate of warming slowed between 16,000 and 14,500 years ago, parallel with the deceleration of the rise in atmospheric carbon dioxide concentrations and with a slight cooling over Greenland. In addition, our chronology supports the hypothesis that the cooling of the Antarctic Cold Reversal is synchronous with the Bolling-Allerod warming in the northern hemisphere 14,700 years ago.
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B. Stenni, D. Buiron, M. Frezzotti, S. Albani, C. Barbante, et al.. Expression of the bipolar see-saw in Antarctic climate records during the last deglaciation. Nature Geoscience, Nature Publishing Group, 2011, 4 (1), pp.46-49. ⟨10.1038/ngeo1026⟩. ⟨insu-00647558⟩



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