Presentation on theme: "New Production Rate Estimates for In Situ Cosmogenic 14 C Cronus-Earth/EU Workshop, Vancouver, July 12-13 2008 Bailey Dugan, Nathaniel Lifton, A.J. Timothy."— Presentation transcript:
New Production Rate Estimates for In Situ Cosmogenic 14 C Cronus-Earth/EU Workshop, Vancouver, July 12-13 2008 Bailey Dugan, Nathaniel Lifton, A.J. Timothy Jull University of Arizona Funded By The U.S. National Science Foundation
Promontory Point Results Site Production Rates Generally Consistent w/Earlier Estimates Replicates Unexplained Variability Use Weighted Means 05PPT-02 Replicates Agree >2 Below Site Weighted Mean No Obvious Reason Higher Position on 05PPT-01 Outcrop Excluded from Further Analysis Additional Analyses Planned CRONUS-Earth 49.7 ± 1.3 w/05PPT-02 51.4 ± 0.8 w/o 05PPT-02 49.7 ± 1.3 w/05PPT-02 51.4 ± 0.8 w/o 05PPT-02
Corrie Nan Arr Results Good Agreement Between Supra- and Sub-Glacial Boulders Supports Assumption of Landslide Deposition on Retreating Glacier Additional Analyses Planned CRONUS-Earth
Maol Chean-Dearg (Mull Kin Jerig) Results Site Production Rates Show Generally Good Agreement Replicates Unexplained Variability Use Weighted Means Additional Analyses Planned CRONUS-Earth
Sea Level, High Latitude (SLHL) Production CRONUS-Earth Four Scaling Models Compared Lal (1991)/Stone(2000) Dunai (2001) Desilets & Zreda (2003)/Desilets et al. (2006) Lifton et al. (2005) Variable Atmosphere Assumed for All Geomagnetic Assumptions Geocentric Axial Dipole for Lal/Stone Continuous Geomagnetic Model of Lifton et al. (2008) for Others
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