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| Titel |
An optimized multi-proxy, multi-site Antarctic ice and gas orbital chronology (AICC2012): 120-800 ka |
| VerfasserIn |
L. Bazin, A. Landais, B. Lemieux-Dudon, H. Toye Mahamadou Kele, D. Veres, F. Parrenin, P. Martinerie, C. Ritz, E. Capron, V. Lipenkov, M.-F. Loutre, D. Raynaud, B. Vinther, A. Svensson, S. O. Rasmussen, M. Severi, T. Blunier, M. Leuenberger, H. Fischer, V. Masson-Delmotte, J. Chappellaz, E. Wolff |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 9, no. 4 ; Nr. 9, no. 4 (2013-08-01), S.1715-1731 |
| Datensatznummer |
250018102
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| Publikation (Nr.) |
 copernicus.org/cp-9-1715-2013.pdf |
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| Zusammenfassung |
| An accurate and coherent chronological framework is essential for the
interpretation of climatic and environmental records obtained from deep polar
ice cores. Until now, one common ice core age scale had been developed based
on an inverse dating method (Datice), combining glaciological modelling with
absolute and stratigraphic markers between 4 ice cores covering the last
50 ka (thousands of years before present) (Lemieux-Dudon et al., 2010). In
this paper, together with the companion paper of Veres et al. (2013), we
present an extension of this work back to 800 ka for the NGRIP, TALDICE,
EDML, Vostok and EDC ice cores using an improved version of the Datice tool.
The AICC2012 (Antarctic Ice Core Chronology 2012) chronology includes
numerous new gas and ice stratigraphic links as well as improved evaluation
of background and associated variance scenarios. This paper concentrates on
the long timescales between 120–800 ka. In this framework, new measurements
of δ18Oatm over Marine Isotope Stage (MIS) 11–12 on
EDC and a complete δ18Oatm record of the TALDICE ice
cores permit us to derive additional orbital gas age constraints. The
coherency of the different orbitally deduced ages (from
δ18Oatm, δO2/N2 and air content) has been
verified before implementation in AICC2012. The new chronology is now
independent of other archives and shows only small differences, most of the
time within the original uncertainty range calculated by Datice, when
compared with the previous ice core reference age scale EDC3, the Dome F
chronology, or using a comparison between speleothems and methane. For
instance, the largest deviation between AICC2012 and EDC3 (5.4 ka) is
obtained around MIS 12. Despite significant modifications of the
chronological constraints around MIS 5, now independent of speleothem records
in AICC2012, the date of Termination II is very close to the EDC3 one. |
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