TY  - JOUR
AU  - Pol K, Masson-Delmotte V.
PY  - 2010//
TI  - 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"
T2  - Earth Planet. Sci. Lett.
JO  - Earth and Planetary Science Letters
SP  - 95
EP  - 103
VL  - 298
IS  - 1-2
KW  - water stable isotopes
KW  - ice cores
KW  - Antarctica
KW  - isotopic diffusion
KW  -
N2  - 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.
SN  - 0012-821X
UR  - http://dx.doi.org/10.1016/j.epsl.2010.07.030
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=2009), last updated on Sat, 06 Jul 2024 07:51:22 +0200
ID  - PolK2010
ER  -