Browsing by Author "Thomson, B"

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    Radiocarbon variations from the Southern Hemisphere, 10,350–9700 cal BP
    (Elsevier, 2004-08) Barbetti, M; Hua, Q; Zoppi, U; Fink, D; Zhao, Y; Thomson, B
    We have made AMS measurements on a series of 10-ring samples from a subfossil Huon pine log found in western Tasmania (42°S, 145°E). The results show a pronounced rise in Δ14C over the first 200 years, and a decrease over the following 160 years. Tree-ring width measurements indicate that this log (catalogue SRT-447) can be cross-dated with another subfossil log (SRT-416) for which a series of high-precision radiometric 14C measurements have previously been made. When the two tree-ring series are thus aligned, SRT-447 is the older of the two logs, and there is a 139-year overlap. We then have a Huon pine floating chronology spanning 680 years, with 14C measurements attached. The 14C data sets agree well within the period of overlap indicated by the tree-rings. The 14C variations from Huon pine show excellent agreement with those from German oak and pine for the period 10,350–9670 cal BP. Aligning the Huon pine 14C series with that from German oak and pine allows us to examine the inter-hemispheric offset in 14C dates in the early Holocene. © 2004 Elsevier B.V.