High-Precision Radiocarbon Measurements of Contemporaneous Tree-Ring Dated Wood from the British Isles and New Zealand: Ad 1850–950

Abstract

ABSTRACT. The University of Waikato, Hamilton, New Zealand and The Queen's University of Belfast, Northern Ireland radiocarbon dating laboratories have undertaken a series of high-precision measurements on decadal samples of dendrochronologically dated oak (Quercus petraea) from Great Britain and cedar (Libocedrus bidwillii) and silver pine (Lagarostrobos colensoi) from New Zealand. The results show an average hemispheric offset over the 900 yr of measurement of 40 ± 13 yr. This value is not constant but varies with a periodicity of about 130 yr. The Northern Hemisphere measurements confirm the validity of the Pearson et al. (1986) calibration dataset.

Extension of the Southern Hemisphere Atmospheric Radiocarbon Curve, 2120–850 Years BP: Results from Tasmanian Huon Pine

“…Because only 3 yr of the Q1323 sample were milled, processed, and analyzed, our analyses of the Q1323 wood are not comparable to the result given by Pearson et al (1986). Figure 2 Overlap interval between this study and data of Hogg et al (2002). With few exceptions, the Huon pine between 995-955 yr BP reported here agrees within 1- error with measurements made at the Waikato (Wk) and Belfast (Qub) laboratories.…”

“…In order to examine the variability in our record for possible periodicity, several periods need to be repli- cated, in particular between 1095 and 1175 yr BP, where the apparent offset of the Tasmanian data appears to reduce to zero. The similarities and differences in detail between these Huon data and other Southern Hemisphere data sets will establish an extended calibration curve for Southern Hemisphere dates, and may further illuminate the question of the size and periodicity of the interhemispheric offset found previously by Hogg and McCormac (Hogg et al 2002;McCormac et al 2002).…”

Shcal04 Southern Hemisphere Calibration, 0–11.0 Cal Kyr BP

“…Sections of the calibration curve, including those that used dendrochronological data, were discussed and agreed upon for inclusion. The data relating to the Southern Hemisphere, including the results from McCormac et al (1998) and Hogg et al (2002) on New Zealand trees covering 0-1000 cal BP; data from the University of Washington Quaternary Isotope Laboratory from Chilean and Tasmanian wood from 0-290 cal BP and 0-55 cal BP, respectively ; New Zealand measurements of Sparks et al (1995)]; and South African measurements from 115-51 cal BP from Pretoria (Vogel et al 1993), were considered. Comparisons between these data sets were given in Table 2 of McCormac et al (2002).…”

Integration of ice‐core, marine and terrestrial records for the Australian Last Glacial Maximum and Termination: a contribution from the OZ INTIMATE group

“…ka BP (a period of rising atmospheric 14 C), but increased to 50 yr or more between 10.1 and 10 cal. ka BP (a period of falling atmospheric 14 C), differences comparable to changes over the past millennium (Hogg et al, 2002). Excitingly, future work will allow the precise comparison of climate proxies derived from the Huon pine with other datasets from the Northern Hemisphere on the same absolute timescale.…”