An optimized multi-proxy, multi-site Antarctic ice and gas orbital chronology (AICC2012): 120--800 ka
Lucie Bazin,Amaelle Landais,Bénédicte Lemieux-Dudon,H Toyé Mahamadou Kele,Daniel Veres,Daniel Veres,Frédéric Parrenin,Patricia Martinerie,Catherine Ritz,Emilie Capron,Vladimir Ya. Lipenkov,Marie-France Loutre,Dominique Raynaud,Bo Møllesøe Vinther,Anders Svensson,Sune Olander Rasmussen,Mirko Severi,Thomas Blunier,Markus Leuenberger,Hubertus Fischer,Valérie Masson-Delmotte,Jérôme Chappellaz,Eric W. Wolff +22 more
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TLDR
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.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 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.read more
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Ice melt, sea level rise and superstorms: evidence from paleoclimate data, climate modeling, and modern observations that 2 °C global warming could be dangerous
James Hansen,Makiko Sato,Paul J. Hearty,Reto Ruedy,Maxwell Kelley,Valérie Masson-Delmotte,Gary L. Russell,George Tselioudis,Junji Cao,Eric Rignot,Eric Rignot,Isabella Velicogna,Isabella Velicogna,Blair R. Tormey,Bailey G. Donovan,Evgeniya Kandiano,Karina von Schuckmann,Pushker Kharecha,Pushker Kharecha,Allegra N. LeGrande,Michael Bauer,Michael Bauer,K. Lo +22 more
TL;DR: The authors used numerical climate simulations, paleoclimate data, and modern observations to study the effect of growing ice melt from Antarctica and Greenland and found that ice mass loss from the most vulnerable ice, sufficient to raise sea level several meters, is better approximated as exponential than by a more linear response.
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Revision of the EPICA Dome C CO2 record from 800 to 600 kyr before present
Bernhard Bereiter,Bernhard Bereiter,Bernhard Bereiter,Sarah Eggleston,Sarah Eggleston,Jochen Schmitt,Jochen Schmitt,Christoph Nehrbass-Ahles,Christoph Nehrbass-Ahles,Thomas F. Stocker,Thomas F. Stocker,Hubertus Fischer,Hubertus Fischer,Sepp Kipfstuhl,Jérôme Chappellaz +14 more
TL;DR: The European Project for Ice Coring in Antarctica Dome ice core from Dome C (EDC) has allowed for the reconstruction of atmospheric CO2 concentrations for the last 800,000 years as mentioned in this paper.
Journal ArticleDOI
The Antarctic ice core chronology (AICC2012): an optimized multi-parameter and multi-site dating approach for the last 120 thousand years
Daniel Veres,Daniel Veres,Lucie Bazin,Amaelle Landais,H Toyé Mahamadou Kele,Bénédicte Lemieux-Dudon,Frédéric Parrenin,Patricia Martinerie,Eric Blayo,Thomas Blunier,Emilie Capron,Jérôme Chappellaz,Sune Olander Rasmussen,Mirko Severi,Anders Svensson,Bo Møllesøe Vinther,Eric W. Wolff +16 more
TL;DR: The Antarctic Ice Core Chronology 2012 (AICC2012) as discussed by the authors is a new and coherent timescale developed for four Antarctic ice cores, namely Vostok, EPICA Dome C (EDC), EPICA Dronning Maud Land (EDML) and Talos Dome (TALDICE), alongside the Greenlandic NGRIP record.
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An optimized scheme of lettered marine isotope substages for the last 1.0 million years, and the climatostratigraphic nature of isotope stages and substages
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Centennial-scale changes in the global carbon cycle during the last deglaciation
Shaun A. Marcott,T. K. Bauska,Christo Buizert,Eric J. Steig,Julia Rosen,Kurt M. Cuffey,Tyler J. Fudge,J. P. Severinghaus,Jinho Ahn,M. Kalk,Joseph R. McConnell,Todd Sowers,Kendrick C. Taylor,James W. C. White,Edward J. Brook +14 more
TL;DR: CO2 and methane records of the last deglaciation from a new high-accumulation West Antarctic ice core are presented with unprecedented temporal resolution and precise chronology and suggest that processes operating on centennial timescales seem to be influencing global carbon-cycle dynamics and are at present not widely considered in Earth system models.
References
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TL;DR: An undisturbed climate record from a North Greenland ice core, which extends back to 123,000 years before the present, within the last interglacial period, shows a slow decline in temperatures that marked the initiation of the last glacial period.
Journal ArticleDOI
Macintosh Program performs time‐series analysis
TL;DR: A Macintosh computer program that can perform many time-series analysis procedures is now available on the Internet free of charge, originally designed for paleoclimatic time series.
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