δ¹⁸Oatm and dO2/N2 records between 100-800 ka from EPICA Dome C ice core on AICC2012 chronology ...

• Main Authors: Extier, Thomas, Landais, Amaëlle, Bréant, Camille, Prié, F, Bazin, Lucie, Dreyfus, Gabrielle, Roche, Didier M, Leuenberger, Markus Christian
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2018
• Subjects: Drilling/drill rig; European Project for Ice Coring in Antarctica EPICA; Antarc*; Antarctic; Antarctica; EPICA; ice core
• Online Access: https://dx.doi.org/10.1594/pangaea.887327; https://doi.pangaea.de/10.1594/PANGAEA.887327

Deep ice core chronologies have been improved over the past years through the addition of new age constraints. However, dating methods are still associated with large uncertainties for ice cores from the East Antarctic plateau where layer counting is not possible. Indeed, an uncertainty up to 6 ka is associated with AICC2012 chronology of EPICA Dome C (EDC) ice core, which mostly arises from uncertainty on the delay between changes recorded in d18Oatm and in June 21st insolation variations at 65°N used for ice core orbital dating. Consequently, we need to enhance the knowledge of this delay to improve ice core chronologies. We present new high-resolution EDC d18Oatm record (153-374 ka) and dO2/N2 measurements (163-332 ka) performed on well-stored ice to provide continuous records of d18Oatm and dO2/N2 between 100 and 800 ka. The comparison of d18Oatm with the d18Ocalcite from East Asian speleothems shows that both signals present similar orbital and millennial variabilities, which may represent shifts in the ... : Supplement to: Extier, Thomas; Landais, Amaëlle; Bréant, Camille; Prié, F; Bazin, Lucie; Dreyfus, Gabrielle; Roche, Didier M; Leuenberger, Markus Christian (2018): On the use of d18O atm for ice core dating. Quaternary Science Reviews, 185, 244-257 ...