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| Content Provider | frontiers |
|---|---|
| Author | Steig, Eric J. Jones, Tyler R. Schauer, Andrew J. Kahle, Emma C. Morris, Valerie A. Vaughn, Bruce H. Davidge, Lindsey White, James W.C. |
| Abstract | The $\delta$D and $\delta^{18}$O values of water are key measurements in polar ice-core research, owing to their strong and well-understood relationship with local temperature. Deuterium excess, $d$, the deviation from the average linear relationship between $\delta$D and $\delta^{18}$O, is also commonly used to provide information about the oceanic moisture sources where polar precipitation originates. Measurements of $\delta^{17}$O and ``$^{17}$O excess" ($\Delta^{17}$O) are also of interest because of their potential to provide information complementary to \textit{d}. Such measurements are challenging because of the greater precision required, particularly for $\Delta^{17}$O. Here, high-precision measurements are reported for $\delta^{17}$O, $\delta^{18}$O, and $\delta$D on a new ice core from the South Pole, using a continuous-flow measurement system coupled to two cavity ring-down laser spectroscopy (CRDS) instruments. Replicate measurements show that at 0.5 cm resolution, external precision is $\sim0.2 \permil$ for $\delta^{17}$O and $\delta^{18}$O, and $\sim1 \permil$ for $\delta$D. For $\Delta^{17}$O, achieving external precision of $\sim 0.01 \permil$ requires depth averages of $\sim$50 cm. The resulting $\sim$54,000 year record of the complete oxygen and hydrogen isotope ratios from the South Pole ice core is discussed. The time series of $\Delta^{17}$O variations from the South Pole shows significant millennial-scale variability, and is correlated with the logarithmic formulation of deuterium excess ($d_{ln}$), but not the traditional linear formulation ($d$). |
| ISSN | 22966463 |
| DOI | 10.3389/feart.2021.640292 |
| Volume Number | 9 |
| Journal | Frontiers in Earth Science |
| Language | English |
| Publisher Date | 2021-03-24 |
| Access Restriction | Open |
| Subject Keyword | Ice core Deuterium 17O Oxygen Isotopes Antarctica Hydrogen isotopes Polar climate |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth and Planetary Sciences |
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