Revised gas age for the Marine Isotope Stage 6 period (190-135 ka) from the EPICA Dome C ice core

We improved the relative age uncertainties between ice and gas in the EDC core using δ15N-based estimates of firn column thickness. A new chronology was established using new δ15N data during the early MIS 6 in this study and published data from Landais et al. (2013), see doi:10.1594/PANGAEA.929513....

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Bibliographic Details
Main Authors: Shin, Jinhwa, Nehrbass-Ahles, Christoph, Grilli, Roberto, Beeman, Jai Chowdhry, Parrenin, Frédéric, Teste, Grégory, Landais, Amaelle, Schmidely, Loïc, Silva, Lucas, Schmitt, Jochen, Bereiter, Bernhard, Stocker, Thomas F, Fischer, Hubertus, Chappellaz, Jérôme A
Format: Dataset
Language:English
Published: PANGAEA 2021
Subjects:
CH4
CO2
DEPTH
ice/snow
Dome C
Antarctica
EDC
EPICA
EPICA Dome C
European Project for Ice Coring in Antarctica
Gas age
standard deviation
Greenhouse gases
Ice core
ICEDRILL
Ice drill
MIS 6
δ15N
Snow Dome
Antarc*
ice core
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.929698
https://doi.org/10.1594/PANGAEA.929698
Description
Summary:We improved the relative age uncertainties between ice and gas in the EDC core using δ15N-based estimates of firn column thickness. A new chronology was established using new δ15N data during the early MIS 6 in this study and published data from Landais et al. (2013), see doi:10.1594/PANGAEA.929513. Isotopes of molecular nitrogen in air bubbles were measured from EDC at the Laboratoire des Sciences du Climat et de l'Environnement (LSCE), France. The gas was extracted from the ice by a wet extraction technique and the released air was analysed by a dual-inlet mass spectrometer (Delta V Plus; Thermo Scientific) (Bréant et al., 2019). In total, 151 samples from 88 depth intervals (63 duplicates) between the depths of 2124.7 and 1875.0 m below the surface were measured, corresponding to the time interval from 205 to 154 kyr BP.

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