New marine dR values for the south pacific subtropical gyre region

Fiona Petchey, Atholl Anderson, Albert Zondervan, Sean Ulm, Alan G Hogg

    Research output: Contribution to journalArticle

    Abstract

    This paper presents 31 new ?R 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 ?R values for the Oceania region. These values indicate that the regional offset (?R) 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.
    Original languageEnglish
    Pages (from-to)373-397
    JournalRadiocarbon
    Volume50
    Issue number3
    Publication statusPublished - 2008

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