Abstract
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.
Highlights
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
Numerous studies have shown that the radiocarbon ages of tree rings formed at the same time in opposite hemispheres are different, with Southern Hemisphere (SH) samples being older by an average of about 40 yr
Summary
Numerous studies have shown that the radiocarbon ages of tree rings formed at the same time in opposite hemispheres are different, with Southern Hemisphere (SH) samples being older by an average of about 40 yr This age difference is known as the interhemispheric (or North–South) offset and varies periodically (~130 yr periodicity, McCormac et al 2002) with amplitudes ranging from –2 to. McCormac et al (2004) used the same SHCal data sets, and extended the calibration curve beyond the range of the SH measurements to 11,000 cal BP by using a random effects model (Buck and Blackwell 2004) to account for the interhemispheric offset varying slowly over time, within the constraints of the offset observed from 50–1000 cal BP. Ratification was obtained at the International Radiocarbon Conference in Paris, France (2012) to recommend the use of the SH data from the data sets given here from 0–2145 cal BP, with an extension to 50,000 cal BP using IntCal data, adjusted by a modeled offset
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