An optimized multi-proxy, multi-site Antarctic ice and gas orbital chronology (AICC2012): 120–800 ka

L. Bazin; A. Landais; H. Toyé Mahamadou Kele; F. Parrenin; P. Martinerie; C. Ritz; Emilie Capron; V. Lipenkov; M.-F Loutre; D. Raynaud; Bo Møllesøe Vinther; Anders Svensson; Sune Olander Rasmussen; M. Severi; Thomas Blunier; M. Leuenberger; H. Fischer; V. Masson-Delmotte; J. Chappellaz; E. Wolff

doi:10.5194/cp-9-1715-2013

An optimized multi-proxy, multi-site Antarctic ice and gas orbital chronology (AICC2012): 120–800 ka

L. Bazin, A. Landais, H. Toyé Mahamadou Kele, F. Parrenin, P. Martinerie, C. Ritz, Emilie Capron, V. Lipenkov, M.-F Loutre, D. Raynaud, Bo Møllesøe Vinther, Anders Svensson, Sune Olander Rasmussen, M. Severi, Thomas Blunier, M. Leuenberger, H. Fischer, V. Masson-Delmotte, J. Chappellaz, E. Wolff

Is-, Klima- og Geofysik

219 Citationer (Scopus)

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Abstract

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 δ ¹⁸Oatm 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.

Originalsprog	Engelsk
Tidsskrift	Climate of the Past
Vol/bind	9
Sider (fra-til)	1715-1731
ISSN	1814-9324
DOI	https://doi.org/10.5194/cp-9-1715-2013
Status	Udgivet - 25 jun. 2013

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Bazin, L., Landais, A., Toyé Mahamadou Kele, H., Parrenin, F., Martinerie, P., Ritz, C., Capron, E., Lipenkov, V., Loutre, M. -F., Raynaud, D., Vinther, B. M., Svensson, A., Rasmussen, S. O., Severi, M., Blunier, T., Leuenberger, M., Fischer, H., Masson-Delmotte, V., Chappellaz, J., & Wolff, E. (2013). An optimized multi-proxy, multi-site Antarctic ice and gas orbital chronology (AICC2012): 120–800 ka. Climate of the Past, 9, 1715-1731. https://doi.org/10.5194/cp-9-1715-2013

Bazin, L, Landais, A, Toyé Mahamadou Kele, H, Parrenin, F, Martinerie, P, Ritz, C, Capron, E, Lipenkov, V, Loutre, M-F, Raynaud, D, Vinther, BM , Svensson, A , Rasmussen, SO, Severi, M, Blunier, T, Leuenberger, M, Fischer, H, Masson-Delmotte, V, Chappellaz, J & Wolff, E 2013, 'An optimized multi-proxy, multi-site Antarctic ice and gas orbital chronology (AICC2012): 120–800 ka', Climate of the Past, bind 9, s. 1715-1731. https://doi.org/10.5194/cp-9-1715-2013

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title = "An optimized multi-proxy, multi-site Antarctic ice and gas orbital chronology (AICC2012): 120–800 ka",

abstract = "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 δ 18Oatm 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.",

author = "L. Bazin and A. Landais and {Toy{\'e} Mahamadou Kele}, H. and F. Parrenin and P. Martinerie and C. Ritz and Emilie Capron and V. Lipenkov and M.-F Loutre and D. Raynaud and Vinther, {Bo M{\o}lles{\o}e} and Anders Svensson and Rasmussen, {Sune Olander} and M. Severi and Thomas Blunier and M. Leuenberger and H. Fischer and V. Masson-Delmotte and J. Chappellaz and E. Wolff",

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doi = "10.5194/cp-9-1715-2013",

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T1 - An optimized multi-proxy, multi-site Antarctic ice and gas orbital chronology (AICC2012)

T2 - 120–800 ka

AU - Bazin, L.

AU - Landais, A.

AU - Toyé Mahamadou Kele, H.

AU - Parrenin, F.

AU - Martinerie, P.

AU - Ritz, C.

AU - Capron, Emilie

AU - Lipenkov, V.

AU - Loutre, M.-F

AU - Raynaud, D.

AU - Vinther, Bo Møllesøe

AU - Svensson, Anders

AU - Rasmussen, Sune Olander

AU - Severi, M.

AU - Blunier, Thomas

AU - Leuenberger, M.

AU - Fischer, H.

AU - Masson-Delmotte, V.

AU - Chappellaz, J.

AU - Wolff, E.

PY - 2013/6/25

Y1 - 2013/6/25

N2 - 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 δ 18Oatm 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.

AB - 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 δ 18Oatm 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.

U2 - 10.5194/cp-9-1715-2013

DO - 10.5194/cp-9-1715-2013

M3 - Journal article

SN - 1814-9324

VL - 9

SP - 1715

EP - 1731

JO - Climate of the Past

JF - Climate of the Past

ER -

An optimized multi-proxy, multi-site Antarctic ice and gas orbital chronology (AICC2012): 120–800 ka

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