Volcanic synchronisation between the EPICA Dome C and Vostok ice cores (Antarctica) 0-145 kyr BP

Parrenin, F. and Petit, J.-R. and Masson-Delmotte, V. and Basile, I. and Jouzel, J. and Lipenkov, V. and Rasmussen, S. and Schwander, J. and Severi, M. and Udisti, R. and Veres, D. and Vinther, B. and Wolff, E. W. (2012) Volcanic synchronisation between the EPICA Dome C and Vostok ice cores (Antarctica) 0-145 kyr BP. Climate of the past, 8. pp. 1031-1045. ISSN 1814-9340 DOI 10.5194/cp-8-1031-2012

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Abstract

Abstract. This study aims at refining the synchronisation between the EPICA Dome C (EDC) and Vostok ice cores in the time interval 0–145 kyr BP by using the volcanic signatures. 102 common volcanic events were identified by using continuous electrical conductivity (ECM), di-electrical profiling (DEP) and sulfate measurements while trying to minimize the distortion of the glaciological chronologies. This is an update and a continuation of previous works performed over the 0–45 kyr interval that provided 56 tie points to the ice core chronologies (Udisti et al., 2004). This synchronisation will serve to establish Antarctic Ice Core Chronology 2012, the next synchronised Antarctic dating. A change of slope in the EDC-depth/Vostok-depth diagram is probably related to a change of accumulation regime as well as to a change of ice thickness upstream of the Lake Vostok, but we did not invoke any significant temporal change of surface accumulation at EDC relative to Vostok. No significant phase difference is detected between the EDC and Vostok isotopic records, but depth shifts between the Vostok 3G and 5G ice cores prevent from looking at this problem accurately. Three possible candidates for the Toba volcanic super-eruption ~73 kyr ago are suggested in the Vostok and EDC volcanic records. Neither the ECM, DEP nor the sulfate fingerprints for these 3 events are significantly larger than many others in the records.

Item Type: Article
Additional Information: © Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License.
Uncontrolled Keywords: NIL AREP
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Climate of the past
Volume: 8
Page Range: pp. 1031-1045
Identification Number: 10.5194/cp-8-1031-2012
Depositing User: Sarah Humbert
Date Deposited: 31 Aug 2013 14:41
Last Modified: 31 Aug 2013 14:41
URI: http://eprints.esc.cam.ac.uk/id/eprint/2847

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