Using in situ 14C to unravel complex exposure histories along the David Glacier, Antarctica

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dc.contributor.authorStutz, Jen_AU
dc.contributor.authorFülöp, RHen_AU
dc.contributor.authorNorton, KPen_AU
dc.contributor.authorMackintosh, ANen_AU
dc.contributor.authorWhitemore, Ren_AU
dc.contributor.authorYang, Ben_AU
dc.contributor.authorSmith, AMen_AU
dc.date.accessioned2023-01-19T21:10:41Zen_AU
dc.date.available2023-01-19T21:10:41Zen_AU
dc.date.issued2021-11-17en_AU
dc.date.statistics2022-06-03en_AU
dc.description.abstractUnderstanding the past Antarctic Ice Sheet (AIS) is critical to forecast the impacts of future of the AIS and its contribution to sea level rise. Ice sheet models constrained by geological data provide improved confidence in future projections. Both marine and terrestrial geologic data are required for a robust reconstruction of both the extent and thickness of the AIS. On land, cosmogenic nuclides have transformed the ability to constrain reconstructions of the past AIS through time. Highresolution, low-inheritance chronologies focused on large outlet glaciers provide enhanced understanding on the timing, rate and potential mechanisms driving past ice sheet change. Using the ‘glacial dip stick’ approach at each site, we sample glacial debris and bedrock from the local peak down to the modern ice surface. While field sampling strategies and analytical capability continues to improve, ‘complex’ exposure histories remain a common occurrence in practice. Inheritance, or a signal of cumulative exposure, can arise due to burial by cold-based, non-crosive nature of the AIS. At Mt. Kring along the upper David Glacier, previous studies show a distinct mid-Holocene signal of glacier thinning as well as at least two populations of apparent older glacial thinning events. Here, we use 14C measurements on samples suspected of having an inherited signal. We show that samples with >30 ka 10Be exposure ages indeed carry a mid-Holocene 14C exposure age and improve the existing thinning history. This multi-nuclide comparison approach provides a preliminary data set to bolster previous and emerging studies where complex exposure histories occur around Antarctica. © The Authorsen_AU
dc.identifier.citationStutz, J., Fülopm R., Norton, K., Mackintosh, A., Whitemore, R., Yang, B., & Smith, A. (2021). Using in situ 14C to unravel complex exposure histories along the David Glacier, Antarctica. Paper presented to the 15th International Conference on Accelerator Mass Spectrometry. ANSTO Sydney, Australia. November 15th – 19th, 2021, (pp. 59). 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.pagination59en_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/10238/14414en_AU
dc.language.isoenen_AU
dc.publisherAustralian Nuclear Science and Technology Organisationen_AU
dc.subjectCarbon 14en_AU
dc.subjectAntarcticaen_AU
dc.subjectGlaciersen_AU
dc.subjectIceen_AU
dc.subjectIsotopesen_AU
dc.subjectRocksen_AU
dc.subjectQuaternary perioden_AU
dc.titleUsing in situ 14C to unravel complex exposure histories along the David Glacier, Antarcticaen_AU
dc.typeConference Abstracten_AU
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