29 Apr 2022
29 Apr 2022
Status: this preprint is open for discussion and under review for Climate of the Past (CP).

Sub-millennial climate variability from high resolution water isotopes in the EDC ice core

Antoine Grisart1, Mathieu Casado1,3, Vasileios Gkinis2, Bo Vinther2, Philippe Naveau1, Mathieu Vrac1, Thomas Laepple3, Bénédicte Minster1, Fréderic Prié1, Barbara Stenni4, Elise Fourré1, Hans-Christian Steen Larsen5, Jean Jouzel1, Martin Werner6, Katy Pol1, Valérie Masson-Delmotte1, Maria Hoerhold6, Trevor Popp2, and Amaelle Landais1 Antoine Grisart et al.
  • 1Laboratoire des Sciences du Climat et de l’Environnement, CEA–CNRS–UVSQ–Paris-Saclay–IPSL, Gif-sur-Yvette, France
  • 2Physics of Ice, Climate and Earth, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
  • 3Alfred Wegener Institute, Helmholtz Center for Polar and Marine Research, Potsdam, Germany
  • 4Department of Environmental Sciences, Informatics and Statistics, University Ca’ Foscari of Venice, Venice, Italy
  • 5Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen 5020, Norway
  • 6Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany

Abstract. The EPICA Dome C (EDC) ice core provides the longest continuous climatic record covering the last 800 000 years (800 kyrs). Obtaining homogeneous high resolution measurements and accounting for diffusion provide a unique opportunity to study the evolution of decadal to millennial variability within the past glacial and interglacial periods. We present here a compilation of high resolution (11 cm) water isotopic records with 27 000 δ18O measurements and 7 920 δD measurements (covering respectively 94 % and 27 % of the whole EDC record), including published and new measurements (2 900 for both δ18O and δD) over the last 800 kyrs on the EDC ice core. We show that overlapping measurement series performed over multiple depth ranges over the past 20 years, using different analytical methods and in different laboratories, are consistent within analytical uncertainty, and therefore can be combined to provide a homogeneous data set. A frequency decomposition of the most complete δ18O record and a simple assessment of the possible influence of diffusion on the measured profile shows that the variability during glacial periods at multi-decadal to multi-centennial timescale is higher than variability of the interglacial periods. This analysis shows as well that during interglacial periods characterized by a temperature optimum at its beginning, the multi-centennial variability is the strongest over this temperature optimum.

Antoine Grisart et al.

Status: open (until 24 Jun 2022)

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Antoine Grisart et al.

Antoine Grisart et al.


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Short summary
This manuscript presents a compilation of high resolution (11 cm) water isotopic records including published and new measurements over the last 800 000 years on the EPICA Dome C ice core, Antarctica. Using this new water isotopes (δ18O and δD) combined dataset, we study the variability and possible influence of diffusion at multi-decadal to multi-centennial scale. We observe a stronger variability on the onset of the interglacial interval corresponding to a warm period.