An abrupt change of Antarctic moisture origin at the end of Termination II

Masson-Delmotte, V.; Stenni, B; Blunier, T; Cattani, O.; Chappellaz, J.; Cheng, H.; Dreyfus, G.; Edwards, R.L.; Falourd, S.; Govin, A.; Kawamura, K.; Johnsen, S.J.; Jouzel, J.; Landais, A.; Lemieux-Dudon, B.; Lourantou, A.; Marshall, G; Minster, B.; Mudelsee, M.; Pol, K.; Rothlisberger, R.; Selmo, E.; Waelbroeck, C.. 2010 An abrupt change of Antarctic moisture origin at the end of Termination II. Proceedings of the National Academy of Sciences, 107 (27). 12091-12094. 10.1073/pnas.0914536107

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Abstract/Summary

The deuterium excess of polar ice cores documents past changes in evaporation conditions and moisture origin. New data obtained from the European Project for Ice Coring in Antarctica Dome C East Antarctic ice core provide new insights on the sequence of events involved in Termination II, the transition between the penultimate glacial and interglacial periods. This termination is marked by a north-south seesaw behavior, with first a slow methane concentration rise associated with a strong Antarctic temperature warming and a slow deuterium excess rise. This first step is followed by an abrupt north Atlantic warming, an abrupt resumption of the East Asian summer monsoon, a sharp methane rise, and a CO2 overshoot, which coincide within dating uncertainties with the end of Antarctic optimum. Here, we show that this second phase is marked by a very sharp Dome C centennial deuterium excess rise, revealing abrupt reorganization of atmospheric circulation in the southern Indian Ocean sector.

Item Type:	Article
Identification Number/DOI:	10.1073/pnas.0914536107
Programmes:	BAS Programmes > Polar Science for Planet Earth (2009 - ) > Climate
ISSN:	0027-8424
NORA Subject Terms:	Meteorology and Climatology Glaciology
Date made live:	20 Aug 2010 08:54
URI:	http://nora.nerc.ac.uk/id/eprint/10575

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