THE C-14 AGE OF THE ICELANDIC VEDDE ASH - IMPLICATIONS FOR YOUNGER-DRYAS MARINE RESERVOIR AGE CORRECTIONS

Increased marine C-14 reservoir ages from the surface water of the North Atlantic are documented for the Younger Dryas period. We use terrestrial and marine AMS C-14 dates from the time of deposition of the Icelandic Vedde Ash to examine the marine C-14 reservoir age. This changed from its modem North Atlantic value of ca. 400 yr to ca. 700 yr during the Younger Dryas climatic event. The increased marine reservoir age has implications for both comparing climatic time series dated by C-14 and understanding palaeoceanographic changes that generated the increase.