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Extier, Thomas; Landais, Amaëlle; Bréant, Camille; Prié, F; Bazin, Lucie; Dreyfus, Gabrielle; Roche, Didier M; Leuenberger, Markus Christian (2018): δ¹⁸Oatm and dO2/N2 records between 100-800 ka from EPICA Dome C ice core on AICC2012 chronology [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.887327, Supplement to: Extier, T et al. (2018): On the use of d18O atm for ice core dating. Quaternary Science Reviews, 185, 244-257, https://doi.org/10.1016/j.quascirev.2018.02.008

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Abstract:
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 InterTropical Convergence Zone position, themselves associated with Heinrich events. We thus propose to use the d18Ocalcite as target for d18Oatm orbital dating. Such a tuning method improves the ice core chronology of the last glacial inception compared to AICC2012 by reconciling NGRIP and mid-latitude climatic records. It is especially marked during Dansgaard-Oeschger 25 where the proposed chronology is 2.2 ka older than AICC2012. This d18Oatm - d18Ocalcite alignment method applied between 100 and 640 ka improves the EDC ice core chronology, especially over MIS 11, and leads to lower ice age uncertainties compared to AICC2012.
Related to:
Bazin, Lucie; Landais, Amaëlle; Capron, Emilie; Masson-Delmotte, Valerie; Ritz, Catherine; Picard, Ghislain; Jouzel, Jean; Dumont, Marie; Leuenberger, Markus Christian; Prié, F (2016): Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores. Climate of the Past, 12(3), 729-748, https://doi.org/10.5194/cp-12-729-2016
Dreyfus, Gabrielle; Parrenin, Frédéric; Lemieux-Dudon, Bénédicte; Durand, Gael; Masson-Delmotte, Valerie; Jouzel, Jean; Barnola, Jean-Marc; Panno, L; Spahni, Renato; Tisserand, Amandine; Siegenthaler, Urs; Leuenberger, Markus Christian (2007): Anomalous flow below 2700 m in the EPICA Dome C ice core detected using d18O of atmospheric oxygen measurements. Climate of the Past, 3(2), 341-353, https://doi.org/10.5194/cp-3-341-2007
Dreyfus, Gabrielle; Raisbeck, Grant M; Parrenin, Frédéric; Jouzel, Jean; Guyodo, Yohan; Nomade, Jérome; Mazaud, Alain (2008): An ice core perspective on the age of the Matuyama-Brunhes boundary. Earth and Planetary Science Letters, 274(1-2), 151-156, https://doi.org/10.1016/j.epsl.2008.07.008
Landais, Amaëlle; Dreyfus, Gabrielle; Capron, Emilie; Jouzel, Jean; Masson-Delmotte, Valerie; Roche, D M; Prié, F; Caillon, Nicolas; Chappellaz, Jérôme A; Leuenberger, Markus Christian; Lourantou, Anna; Parrenin, Frédéric; Raynaud, Dominique; Teste, Grégory (2013): Two-phase change in CO2, Antarctic temperature and global climate during Termination II. Nature Geoscience, 6(12), 1062-1065, https://doi.org/10.1038/ngeo1985
Landais, Amaëlle; Dreyfus, Gabrielle; Capron, Emilie; Pol, Katy; Loutre, Marie-France; Raynaud, Dominique; Lipenkov, Vladimir Ya; Arnaud, Laurent; Masson-Delmotte, Valerie; Paillard, Didier; Jouzel, Jean; Leuenberger, Markus Christian (2012): Towards orbital dating of the EPICA Dome C ice core using dO2/N2. Climate of the Past, 8(1), 191-203, https://doi.org/10.5194/cp-8-191-2012
Project(s):
European Project for Ice Coring in Antarctica (EPICA)
Funding:
Fifth Framework Programme (FP5), grant/award no. EVK2-CT-2000-00077: European Project for Ice Coring in Antarctica
Fourth Framework Programme (FP4), grant/award no. ENV4980702: European Project for Ice Coring in Antarctica
Coverage:
Latitude: -75.102000 * Longitude: 123.395000
Event(s):
DomeC * Latitude: -75.102000 * Longitude: 123.395000 * Elevation: 3233.0 m * Method/Device: Drilling/drill rig (DRILL)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets

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Datasets listed in this publication series

  1. Extier, T; Landais, A; Bréant, C et al. (2018): δ¹⁸Oatm records between 100-800 ka from EPICA Dome C ice core. https://doi.org/10.1594/PANGAEA.887323
  2. Extier, T; Landais, A; Bréant, C et al. (2018): dO2/N2 records between 100-800 ka from EPICA Dome C ice core. https://doi.org/10.1594/PANGAEA.887326