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New Marine ΔR Values for the South Pacific Subtropical Gyre Region

Published online by Cambridge University Press:  18 July 2016

Fiona Petchey*
Affiliation:
Radiocarbon Dating Laboratory, University of Waikato, Hamilton, New Zealand
Atholl Anderson
Affiliation:
Research School of Pacific and Asian Studies, Australian National University
Albert Zondervan
Affiliation:
National Isotope Centre, GNS Science, Lower Hutt, New Zealand
Sean Ulm
Affiliation:
Aboriginal and Torres Strait Islander Studies Unit, University of Queensland, Australia
Alan Hogg
Affiliation:
Radiocarbon Dating Laboratory, University of Waikato, Hamilton, New Zealand
*
Corresponding author. Email: fpetchey@waikato.ac.nz
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Abstract

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This paper presents 31 new ΔR results of known-age, pre-AD 1950 shells from the South Pacific subtropical gyre region, spanning from the Tuamotu Archipelago in the east to New Caledonia in the west. This doubles the number of available ΔR values for the Oceania region. These values indicate that the regional offset (ΔR) from the modeled radiocarbon marine age has remained relatively constant over the last 100 yr prior to 1950. Variation from the norm can be attributed to various influences including localized upwelling around islands, the presence of a hardwater effect, direct ingestion of old carbon by the live shellfish, or enhanced exchange with atmospheric CO2 as a consequence of photosynthetic activity or increased aeration.

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