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

Abstract We report high resolution measurements of the stable water isotope ratios (δ 18O, δD) 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 Brow...

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Bibliographic Details
Published in:Scientific Data
Main Authors: Vasileios Gkinis, Sarah Jackson, Nerilie J. Abram, Christopher Plummer, Thomas Blunier, Margaret Harlan, Helle Astrid Kjær, Andrew D. Moy, Kerttu Maria Peensoo, Thea Quistgaard, Anders Svensson, Tessa R. Vance
Format: Article in Journal/Newspaper
Language:English
Published: Nature Portfolio 2024
Subjects:
Science
Q
Antarctic
Austral
Indian
Mount Brown
South Ice
Antarc*
ice core
Online Access:https://doi.org/10.1038/s41597-024-03751-w
https://doaj.org/article/4e3140834ff74a8c9df4f690269715f6
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Summary:Abstract We report high resolution measurements of the stable water isotope ratios (δ 18O, δD) 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 18O and δD.

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