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      Excursions in the 14 C record at A.D. 774-775 in tree rings from Russia and America : JULL ET. AL.; EXCURSIONS IN 14C AT AD 774-775

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          Discussion Reporting of 14C Data

          Count rates, representing the rate of 14C decay, are the basic data obtained in a 14C laboratory. The conversion of this information into an age or geochemical parameters appears a simple matter at first. However, the path between counting and suitable 14C data reporting (table 1) causes headaches to many. Minor deflections in pathway, depending on personal interpretations, are possible and give end results that are not always useful for inter-laboratory comparisons. This discussion is an attempt to identify some of these problems and to recommend certain procedures by which reporting ambiguities can be avoided.
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            High-Precision Radiocarbon Age Calibration for Terrestrial and Marine Samples

            Single-year and decadal radiocarbon tree-ring ages are tabulated and discussed in terms of14C age calibration. The single-year data form the basis of a detailed14C age calibration curve for the cal ad 1510–1954 interval (“cal” denotes calibrated). The Seattle decadal data set (back to 11,617 cal BP, with 0 BP = ad 1950) is a component of the integrated decadal INTCAL9814C age curve (Stuiveret al.1998). Atmospheric14C ages can be transformed into14C ages of the global ocean using a carbon reservoir model. INTCAL9814C ages, used for these calculations, yield global ocean14C ages differing slightly from previously published ones (Stuiver and Braziunas 1993b). We include discussions of offsets, error multipliers, regional14C age differences and marine14C age response to oceanic and atmospheric forcing.
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              SHCal13 Southern Hemisphere Calibration, 0–50,000 Years cal BP

              The Southern Hemisphere SHCal04 radiocarbon calibration curve has been updated with the addition of new data sets extending measurements to 2145 cal BP and including the ANSTO Younger Dryas Huon pine data set. Outside the range of measured data, the curve is based upon the ern Hemisphere data sets as presented in IntCal13, with an interhemispheric offset averaging 43 ± 23 yr modeled by an autoregressive process to represent the short-term correlations in the offset.
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                Author and article information

                Journal
                Geophysical Research Letters
                Geophys. Res. Lett.
                Wiley-Blackwell
                00948276
                April 28 2014
                April 28 2014
                : 41
                : 8
                : 3004-3010
                10.1002/2014GL059874
                © 2014

                http://doi.wiley.com/10.1002/tdm_license_1

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