<sup>81</sup>Kr dating of 1 kg Antarctic ice.
basic_science · Level V
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- Record sourced from PubMed, PMID 40355418.
- Also identified by DOI 10.1038/s41467-025-59264-6 and PMC identifier 12069602.
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Abstract
Recovering earth's climate history from ice cores requires reliable dating of the ice. <sup>81</sup>Kr is ideal for radiometric dating up to more than one million years, but the isotope is so rare that it has long been a challenge to apply <sup>81</sup>Kr dating on ice cores where sample size is limited. Here, we show <sup>81</sup>Kr dating of 1-kg ice-core samples from Taylor Glacier, Antarctica. This is made possible by an advance in <sup>81</sup>Kr detection with an all-optical realization of Atom Trap Trace Analysis. The achieved sample-size reduction facilitates <sup>81</sup>Kr dating of basal ice-core sections with direct implications for open questions in paleoclimatology, such as the evolution of glaciers on the Tibetan Plateau or the stability of the Greenland and West-Antarctic ice sheets.