Preprints
https://doi.org/10.5194/egusphere-2024-237
https://doi.org/10.5194/egusphere-2024-237
12 Feb 2024
 | 12 Feb 2024

Total Air Content measurements from the RECAP ice core

Sindhu Vudayagiri, Bo Vinther, Johannes Freitag, Peter L. Langen, and Thomas Blunier

Abstract. Total air content (TAC) of the REnland ice CAP project (RECAP) core, drilled in summer 2015, is measured as a part of investigating the elevation history of the Greenland Ice Sheet (GIS). TAC is a proxy for the elevation at which the ice was originally formed as the TAC in ice cores is predominantly influenced by surface air pressure and conditions like temperature and local summer insolation. The RECAP TAC data shows incoherently low values in the Holocene climatic optimum (6 to 9 kyr b2k) and in the Eemian (119 to 121 kyr b2k) which renders the TAC data unfit for paleo elevation interpolation. In contrast, the glacial section (11.7 kyr to 119 kyr b2K) has consistent TAC values thus in principle facilitating the past elevation calculations. However, we observe TAC variations related to Dansgaard-Oeschger events (D-O) that cannot originate from elevation changes but must be linked to changes in the firn structure. We analyse the pattern of the structural changes in the RECAP and NGRIP cores. For the melt affected sections (Holocene and Eemian) we use melt affected TAC to reconstruct summer temperatures.

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Sindhu Vudayagiri, Bo Vinther, Johannes Freitag, Peter L. Langen, and Thomas Blunier

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-237', Anonymous Referee #1, 06 Mar 2024
    • AC2: 'Reply on RC1', Thomas Blunier, 24 May 2024
  • RC2: 'Comment on egusphere-2024-237', Anonymous Referee #2, 07 Apr 2024
    • AC1: 'Reply on RC2', Thomas Blunier, 24 May 2024
Sindhu Vudayagiri, Bo Vinther, Johannes Freitag, Peter L. Langen, and Thomas Blunier
Sindhu Vudayagiri, Bo Vinther, Johannes Freitag, Peter L. Langen, and Thomas Blunier

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Short summary
During the formation of ice from natural snowfall air is occluded in polar ice. The amount of air occluded (total air content) mainly reflects air pressure when the air is occluded and is therefore a proxy for elevation. However, there are several complications, such as melt, changes in firn structure and air pressure variability. We measured total air content in the RECAP ice core on the Renland Icecap in East Greenland. The core covers the period back to 121 thousand years before present.