An East Antarctic, sub-annual resolution water isotope record from the Mount Brown South Ice core

• Published in: Scientific data Vol. 11; no. 1; pp. 986 - 16
• Main Authors: Gkinis, Vasileios, Jackson, Sarah, Abram, Nerilie J., Plummer, Christopher, Blunier, Thomas, Harlan, Margaret, Kjær, Helle Astrid, Moy, Andrew D., Peensoo, Kerttu Maria, Quistgaard, Thea, Svensson, Anders, Vance, Tessa R.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 10-09-2024; Nature Publishing Group; Nature Portfolio
• Subjects: 639/638/11/2257; 704/106/125; 704/106/413; Archives & records; Climate change; Cores; Data Descriptor; Drilling; Humanities and Social Sciences; Isotopes; multidisciplinary; Precipitation; Science; Science (multidisciplinary); Snow; Spectroscopy; Summer; Water
• ISSN: 2052-4463; 2052-4463
• DOI: 10.1038/s41597-024-03751-w

We report high resolution measurements of the stable water isotope ratios (
δ
18
O,
δ
D) from the Mount Brown South ice core (MBS, 69.11
°
S 86.31
°
E). The record covers the period 873 - 2009 CE with sub-annual temporal resolution. Preliminary analyses of surface cores have shown the Mount Brown South site has relatively high annual snowfall accumulation (0.3 metres ice equivalent) with a seasonal bias toward lower snowfall during austral summer. Precipitation at the site is frequently related to intense, short term synoptic scale events from the mid-latitudes of the southern Indian Ocean. Higher snowfall regimes are associated with easterly winds, while lower snowfall regimes are associated with south-easterly winds. Isotope ratios are measured with Infra-Red Cavity Ring Down Spectroscopy, calibrated on the VSMOW/SLAP scale and reported on the MBS2023 time scale interpolated accordingly. We provide estimates for measurement precision and internal accuracy for
δ
18
O and
δ
D.