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Radiometric 81 Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica

descriptionPublicationkeyboard_double_arrow_right Article , Preprint , Journal 21 Apr 2014Embargo end date: 01 Jan 2014 United States Publisher:Proceedings of the National Academy of SciencesJournal:Proceedings of the National Academy of Sciences, volume 111, pages 6,876-6,881 (issn: 0027-8424, eissn: 1091-6490,

Authors: Buizert, Christo; Baggenstos, Daniel; Jiang, Wei; Purtschert, Roland; Petrenko, Vasilii V; Lu, Zheng-Tian; Müller, Peter; +4 Authors

doi: 10.1073/pnas.1320329111 , 10.48550/arxiv.1403.6201 , 10.7892/boris.74092

pmid: 24753606

pmc: PMC4024921

arXiv: 1403.6201 , http://arxiv.org/abs/1403.6201

Radiometric 81 Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica

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Abstract

Significance Past variations in Earth’s climate and atmospheric composition are recorded in accumulating polar meteoric ice and the air trapped within it. Ice outcrops provide accessible archives of old ice but are difficult to date reliably. Here we demonstrate 81 Kr radiometric dating of ice, allowing accurate dating of up to 1.5 million-year-old ice. The technique successfully identifies valuable ice from the previous interglacial period at Taylor Glacier, Antarctica. Our method will enhance the scientific value of outcropping sites as archives of old ice needed for paleoclimatic reconstructions and can aid efforts to extend the ice core record further back in time.

Country

United States

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Keywords

550, Climate Change, Ice, Radiometric Dating, geochronology, paleoclimatology, Antarctic Regions, Reproducibility of Results, FOS: Physical sciences, Krypton Radioisotopes, physics.geo-ph, Geophysics (physics.geo-ph), Physics - Geophysics, glaciology, Ice Cover, Gases, Life Below Water

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