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https://doi.org/10.5194/egusphere-2022-60
https://doi.org/10.5194/egusphere-2022-60
25 Apr 2022
 | 25 Apr 2022

Improving continuous-flow analysis of triple oxygen isotopes in ice cores: insights from replicate measurements

Lindsey Davidge, Eric J. Steig, and Andrew J. Schauer

Abstract. Stable water isotope measurements from polar ice cores provide high-resolution information about past hydrologic conditions and are therefore important to understanding Earth's climate system. Routine high-resolution measurements of δ18O, δD, and deuterium excess are made by continuous-flow analysis (CFA) methods that include laser spectroscopy instruments. Recent advances in instrumentation allow for simultaneous measurements of all stable water isotopes, including δ17O and 17O excess (Δ17O). Here, we present replicate measurements of an ice core sample taken from Summit, Greenland, using a CFA system coupled to a cavity ring-down laser spectroscopy (CRDS) instrument. We demonstrate that our CFA-CRDS method can make high-precision measurements of Δ17O (< 5 per meg) with high resolution (a few cm) in ice core samples. We find that calibration errors generate most of the variability among the replicate datasets. Our work shows that CFA-CRDS methods can detect seasonal variability in Δ17O. We suggest that CFA-CRDS methods should be applied to ice core measurements when high-resolution information is desired.

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Journal article(s) based on this preprint

22 Dec 2022
Improving continuous-flow analysis of triple oxygen isotopes in ice cores: insights from replicate measurements
Lindsey Davidge, Eric J. Steig, and Andrew J. Schauer
Atmos. Meas. Tech., 15, 7337–7351, https://doi.org/10.5194/amt-15-7337-2022,https://doi.org/10.5194/amt-15-7337-2022, 2022
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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We describe a continuous flow method to measure Δ17O by laser spectroscopy, and we show that...
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