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New MIS 19 EPICA Dome C high resolution deuterium data: Hints for a problematic preservation of climate variability at sub-millennial scale in the "oldest ice"

Abstract : Marine Isotope Stage 19 (MIS 19) is the oldest interglacial period archived in the EPICA Dome C ice core (~ 780 ky BP) and the closest "orbital analogue" to the Holocene -- albeit with a different obliquity amplitude and phase with precession. New detailed deuterium measurements have been conducted with a depth resolution of 11 cm (corresponding time resolution of ~ 130 years). They confirm our earlier low resolution profile (55 cm), showing a relatively smooth shape over the MIS 20 to MIS 18 time period with a lack of sub-millennial climate variability, first thought to be due to this low resolution. The MIS 19 high resolution profile actually reveals a strong isotopic diffusion process leading to a diffusion length of at least ~ 40 cm erasing sub-millennial climate variability. We suggest that this diffusion is caused by water-veins associated with large ice crystals at temperatures above ‑10 °C, temperature conditions in which the MIS 19 ice has spent more than 200 ky. This result has implications for the selection of the future "oldest ice" drilling site.
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https://hal-insu.archives-ouvertes.fr/insu-00562445
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Submitted on : Thursday, February 3, 2011 - 12:22:39 PM
Last modification on : Friday, September 25, 2020 - 9:16:03 AM

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K. Pol, Valérie Masson-Delmotte, S. Johnsen, M. Bigler, O. Cattani, et al.. New MIS 19 EPICA Dome C high resolution deuterium data: Hints for a problematic preservation of climate variability at sub-millennial scale in the "oldest ice". Earth and Planetary Science Letters, Elsevier, 2010, 298 (1-2), pp.95-103. ⟨10.1016/J.EPSL.2010.07.030⟩. ⟨insu-00562445⟩

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