An Age Scale for the First Shallow (Sub-)Antarctic Ice Corefrom Young Island, Northwest Ross Sea

The climate of the sub-Antarctic is important in understanding the environmental conditions of Antarctica and the Southern Ocean. However, regional climate proxy records from this region are scarce. In this study, we present the stable water isotopes, major ion chemistry, and dust records from the f...

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Bibliographic Details
Published in:Geosciences
Main Authors: Moser, Dorothea Elisabeth, Jackson, Sarah, Kjaer, Helle Astrid, Markle, Bradley, Ngoumtsa, Estelle, Pedro, Joel B, Segato, Delia, Spolaor, Andrea, Tetzner, Dieter, Vallelonga, Paul, Thomas, E.R.
Format: Article in Journal/Newspaper
Language:English
Published: MDPI 2023
Subjects:
age scale
(sub-)Antarctic island
shallow ice core
proxies
melting
Antarctic
Southern Ocean
Ross Sea
Young Island
Sturge Island
Antarc*
Antarctica
ice core
Swiss Polar Institute
Online Access:http://hdl.handle.net/1885/292239
https://doi.org/10.3390/geosciences11090368
https://openresearch-repository.anu.edu.au/bitstream/1885/292239/3/geosciences-11-00368-v2.pdf.jpg
Description
Summary:The climate of the sub-Antarctic is important in understanding the environmental conditions of Antarctica and the Southern Ocean. However, regional climate proxy records from this region are scarce. In this study, we present the stable water isotopes, major ion chemistry, and dust records from the first ice core from the (sub-)Antarctic Young Island. We present and discuss various dating approaches based on commonly used ice core proxies, such as stable water isotopes and seasonally deposited ions, together with site-specific characteristics such as melt layers. The dating approaches are compared with estimated precipitation rates from reanalysis data (ERA5) and volcanic cryptotephra shards likely presenting an absolute tie point from a 2001 CE eruption on neighboring Sturge Island. The resulting ice core age scale spans the period 2016 to 1995, with an uncertainty of ±2 years. Funding was provided to subICE by École Polytechnique Fédérale de Lausanne, the Swiss Polar Institute, and Ferring Pharmaceuticals Inc (grant no. subICE). ERT received core funding from NERC to the British Antarctic Survey’s Ice Dynamics and Palaeoclimate programme. DEM was supported by BAS, Cambridge, and the NERC C-CLEAR doctoral training programme (grant no. NE/S007164/1). JBP received grant funding from the Australian Government.

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