How many and from where? Assessing the sensitivity of exposure durations calculated from paired bedrock 14C/10Be measurements in glacial troughs |
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| Institution: | 1. Center for Chronic Immunodeficiency, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany;2. Institute of Pathology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany;3. Center for Pediatrics and Adolescent Medicine, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany;4. Department of Rheumatology and Clinical Immunology, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany;1. Department of Medicine, Albert Einstein College of Medicine, Bronx, NY 10467, USA;2. Virginia Commonwealth University School of Social Work, Richmond, VA, USA;3. Department of Psychiatry, Virginia Commonwealth University School of Medicine, Richmond, VA, USA;4. The University of Texas School of Public Health, Dallas Regional Campus, Dallas, TX 75390, USA;5. Longwood University, College of Education and Human Services, Farmville, VA 23909, USA;6. University of Haifa, School of Political Science, Terrace Bldg., Haifa 3498838, Israel;7. Rush University Medical Center, Department of Behavioral Sciences, Chicago, IL, USA;8. University of Macau, Department of Psychology, Faculty of Social Sciences, Taipa, Macau, People''s Republic of China;9. Department of Health, Behavior & Society, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA;10. American Cancer Society, Intramural Research Department, 250 Williams St., Atlanta, GA 30303, USA |
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| Abstract: | We present a sensitivity analysis of the isochron approach of Goehring et al. (2013) for paired measurements of in situ 14C/10Be from glacially sculpted bedrock surfaces. This analysis tests how sensitive the resulting exposure durations from this technique are to both the number of samples analyzed and their locations along a glacial trough transect, using a dataset from Goehring et al. (2011) as a test case. A simple equally weighted combinatorial approach was employed to (1) generate non-repetitive combinations of n subsets of samples arranged from the ten possible samples (where n < 10), and (2) estimate the exposure duration and uncertainty for each set of simulations. Results from the Goehring et al. (2011) data indicate that five samples evenly distributed along a transect parallel to the ice margin are the minimum number of samples required for this method, while eight or more samples provide an optimal combination of accuracy and precision at the 1σ level. These findings should be applicable to paired in situ 14C/10Be measurements from other polished bedrock troughs at glacial margins, but need further experimental confirmation. |
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| Keywords: | Sensitivity Bayesian Isochron |
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