New production rate estimates for in situ cosmogenic 14 c
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New Production Rate Estimates for In Situ Cosmogenic 14 C. Bailey Dugan, Nathaniel Lifton, A.J. Timothy Jull University of Arizona. Cronus-Earth/EU Workshop, Vancouver, July 12-13 2008. Funded By The U.S. National Science Foundation. Promontory Point Results.

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New production rate estimates for in situ cosmogenic 14 c
New Production Rate Estimates for In Situ Cosmogenic 14C

Bailey Dugan, Nathaniel Lifton, A.J. Timothy Jull

University of Arizona

Cronus-Earth/EU Workshop, Vancouver, July 12-13 2008

Funded By The U.S. National Science Foundation


Promontory point results
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

49.7 ± 1.3 w/05PPT-02

51.4 ± 0.8 w/o 05PPT-02

CRONUS-Earth


Corrie nan arr results
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
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
Sea Level, High Latitude (SLHL)Production

  • 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

CRONUS-Earth



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