Towards 14C-dating of gases in ice cores – constraining the in situ cosmogenic 14C production rates by muons

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dc.contributor.authorDyonisius, MNen_AU
dc.contributor.authorPetrenko, VVen_AU
dc.contributor.authorSmith, AMen_AU
dc.contributor.authorHmiel, Ben_AU
dc.contributor.authorNeff, PDen_AU
dc.contributor.authorYang, Ben_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorPlace, PFen_AU
dc.contributor.authorMenking, Jen_AU
dc.contributor.authorShackleton, SAen_AU
dc.contributor.authorBeaudette, Ren_AU
dc.contributor.authorHarth, CMen_AU
dc.contributor.authorKalk, Men_AU
dc.contributor.authorRoop, Hen_AU
dc.contributor.authorBereiter, Ben_AU
dc.contributor.authorArmanetti, Cen_AU
dc.contributor.authorBuizert, Cen_AU
dc.contributor.authorSchmitt, Jen_AU
dc.contributor.authorBrook, EJen_AU
dc.contributor.authorSeveringhaus, JPen_AU
dc.contributor.authorWeiss, RFen_AU
dc.contributor.authorMcConnell, JRen_AU
dc.date.accessioned2023-01-19T21:59:43Zen_AU
dc.date.available2023-01-19T21:59:43Zen_AU
dc.date.issued2021-11-17en_AU
dc.date.statistics2022-06-03en_AU
dc.description.abstractRadiocarbon dating of glacial ice has been a longstanding goal in ice core science. In glacial ice, ¹⁴ C is incorporated mainly through trapping of ¹⁴ C-containing atmospheric gases (¹⁴ CO₂ , ¹⁴ CO, and ¹⁴ CH₄ ). However, ¹⁴ C in ice is also produced in situ, directly in the ice lattice from reactions with secondary cosmic rays. In situ ¹⁴ C in ice mostly accumulates after bubble close-off (generally at firn depths between 50-120 m) because almost all of the in situ produced ¹⁴ C in the firn column is lost to the atmosphere via diffusion. The in situ ¹⁴ C at corresponding close-off depths of most ice core sites is generally dominated by production from deep penetrating muons. Understanding the muogenic ¹⁴ C production rates is thus important to deconvolve the in situ cosmogenic and atmospheric ¹⁴ C signals in ice cores. In this study, we use measurements of ¹⁴ C in ancient ice (>50 kilo-annum before present, ka BP) from the Taylor Glacier ablation site, Antarctica to calibrate the muogenic ¹⁴ C production rates. We find that literature values are overestimated by factors of 5.7 (3.6-13.9, 95% confidence interval) and 3.7 (2.0-11.9 95% confidence interval) for negative muon capture and fast muon interactions respectively. Furthermore, the partitioning between the in situ ¹⁴ C species appears to be constant (¹⁴ CO:¹⁴ CO₂ ratio of 1:2, with small <0.2% contributions from ¹⁴ CH₄ ). Our results allow for future ice core ¹⁴ C studies to be potentially used for several applications, including absolute dating of gases and improving the ¹⁴ C calibration curve in periods where high-resolution tree ring data are not available.en_AU
dc.identifier.citationDyonisius, M., Petrenko, V., Smith, A., Hmiel, B., Neff, P., Yang, B., Hua, Q., Place, P., Menking, J., Shackleton, S., Beaudette, R., Harth, C., Kalk, M., Roop, H., Bereiter, B., Armanetti, C., Buizert, C., Schmitt, J., Brook, E., Severinghaus, J., Weiss, R., & McConnell, J. (2021). Towards 14C-dating of gases in ice cores – constraining the in situ cosmogenic 14C production rates by muons. Paper presented to the 15th International Conference on Accelerator Mass Spectrometry. ANSTO Sydney, Australia. November 15th – 19th, 2021. (pp. 57). Retrieved from: https://ams15sydney.com/wp-content/uploads/2021/11/AMS-15-Full-Program-and-Abstract-Book-R-1.pdfen_AU
dc.identifier.conferenceenddate19 November 2021en_AU
dc.identifier.conferencename15th International Conference on Accelerator Mass Spectrometryen_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate15 November 2021en_AU
dc.identifier.pagination57en_AU
dc.identifier.urihttps://ams15sydney.com/wp-content/uploads/2021/11/AMS-15-Full-Program-and-Abstract-Book-R-1.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14418en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.subjectCarbon 14en_AU
dc.subjectGasesen_AU
dc.subjectIceen_AU
dc.subjectDrill coresen_AU
dc.subjectGlaciersen_AU
dc.subjectTree ringsen_AU
dc.subjectMuonsen_AU
dc.titleTowards 14C-dating of gases in ice cores – constraining the in situ cosmogenic 14C production rates by muonsen_AU
dc.typeConference Abstracten_AU
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