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

Stenni, 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.; ... (2011). Expression of the bipolar see-saw in Antarctic climate records during the last deglaciation. Nature geoscience, 4(January), pp. 46-49. London: Nature Publishing Group 10.1038/ngeo1026

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Ice-core records of climate from Greenland and Antarctica show asynchronous temperature variations on millennial timescales during the last glacial period (1). 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 (2). However, a record from the Ross Sea sector of East Antarctica has been suggested to be synchronous with Northern Hemisphere climate change (3). 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 (4), 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(5).

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Baumgartner, Matthias, Schilt, Adrian, Schüpbach, Simon, Schwander, Jakob, Stocker, Thomas

ISSN:

1752-0894

Publisher:

Nature Publishing Group

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 14:27

Last Modified:

05 Dec 2022 14:08

Publisher DOI:

10.1038/ngeo1026

Web of Science ID:

000285498600017

BORIS DOI:

10.48350/10122

URI:

https://boris.unibe.ch/id/eprint/10122 (FactScience: 215964)

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