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

TitoloExpression of the bipolar see-saw in Antarctic climate records during the last deglaciation
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2011
AutoriStenni, B., Buiron D., Frezzotti M., Albani S., Barbante C., Bard E., Barnola J.M., Baroni M., Baumgartner M., Bonazza M., Capron E., Castellano E., Chappellaz J., Delmonte B., Falourd S., Genoni L., Iacumin P., Jouzel J., Kipfstuhl S., Landais A., Lemieux-Dudon B., Maggi V., Masson-Delmotte V., Mazzola C., Minster B., Montagnat M., Mulvaney R., Narcisi B., Oerter H., Parrenin F., Petit J.R., Ritz C., Scarchilli Claudio, Schilt A., Schüpbach S., Schwander J., Selmo E., Severi M., Stocker T.F., and Udisti R.
RivistaNature Geoscience
Volume4
Paginazione46-49
ISSN17520894
Parole chiaveantarctica, Arctic, Atlantic Sector, Climate change, core analysis, deglaciation, East Antarctica, Greenland, Ice core, Last Glacial, Ross Sea, Southern Ocean, Talos Dome, temperature effect, temporal record
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 Bølling-Allerød warming in the northern hemisphere 14,700 years ago. © 2011 Macmillan Publishers Limited. All rights reserved.

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cited By 173

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-78650555903&doi=10.1038%2fngeo1026&partnerID=40&md5=06a0e98574f8867ed9d67b1612fc5d27
DOI10.1038/ngeo1026
Citation KeyStenni201146