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Nature 444 (2006) 195 à 198
One-to-one coupling of glacial climate variability in Greenland and Antarctica
C. Barbante1, 2, 3, Jean-Marc Barnola3, 4, Silvia Becagli3, 5, J. Beer3, 6, M. Bigler3, 7, Claude F. Boutron3, 4, T. Blunier3, 7, E. Castellano3, 5, O. Cattani3, 8, Jérome Chappellaz3, 4, D. Dahl-Jensen3, M. Debret4, Barbara Delmonte9, D. Dick, S. Falourd3, 8, S. Faria3, U. Federer3, Hubertus Fischer10, J. Freitag10, A. Frenzel10, D. Fritzsche10, F. Fundel10, Paolo Gabrielli1, 4, V. Gaspari9, R. Gersonde10, W. Graf11, D. Grigoriev12, I. Hamann10, M. Hansson13, G. Hoffmann8, M. A. Hutterli7, 14, P. Huybrechts10, 15, E. Isaksson16, S. Johnsen7, Jean Jouzel8, M. Kaczmarska16, T. Karlin13, P. Kaufmann7, S. Kipfstuhl10, M. Kohno10, F. Lambert7, Anja Lambrecht10, Astrid Lambrecht10, A. Landais8, G. Lawer10, M. Leuenberger7, G. Littot14, L. Loulergue4, D. Lüthi7, V. Maggi9, F. Marino9, V. Masson-Delmotte8, H. Meyer10, H. Miller10, R. Mulvaney14, B. Narcisi17, J. Oerlemans18, H. Oerter10, F. Parrenin4, Jean-Robert Petit4, G. Raisbeck19, D. Raynaud4, R. Röthlisberger14, U. Ruth10, O. Rybak10, M. Severi5, J. Schmitt10, J. Schwander7, U. Siegenthaler7, M. L. Siggaard-Andersen3, R. Spahni7, J. P. Steffensen3, B. Stenni20, T. F. Stocker7, J. L. Tison21, R. Traversi5, R. Udisti5, F. Valero-Delgado10, M. R. Van Den Broeke18, R. S. W. Wan De Wal18, D. Wagenbach22, A. Wegner10, K. Weiler10, F. Wilhelms10, J. G. Winther16, E. Wolff14

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.
1 :  Institute for the Dynamics of Environmental Processes-CNR
2 :  Department of Environmental Sciences
3 :  NBI - Niels Bohr Institute
4 :  LGGE - Laboratoire de glaciologie et géophysique de l'environnement
5 :  Department of Chemistry
6 :  EAWAG - Swiss Federal Institute of Aquatic Science and Technology
7 :  Climate and Environmental Physics [Bern]
8 :  LSCE - UMR 8212 - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
9 :  Department of Environmental Sciences
10 :  Department of Bentho-pelagic processes
11 :  GSF - Forschungszentrum fur Umwelt und Gesundheit
12 :  UCL - University College London - London's Global University
13 :  Department of Physical Geography and Quaternary Geology
14 :  BAS - British Antarctic Survey
15 :  Departement Geografie
16 :  Norwegian Polar Institute
17 :  ENEA - Italian National agency for new technologies, Energy and sustainable economic development
18 :  Institute for Marine and Atmospheric research Utrecht (IMAU)
19 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
20 :  Department of Geological Environmental and Marine Sciences
21 :  Département des Sciences de la Terre
22 :  Institute for Environmental Physics
Planète et Univers/Sciences de la Terre/Glaciologie