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 Nor th Atlantic are documented for the Younger Dryas period. We use terres trial and marine AMS C-14 dates from the time of deposition of the Ice landic Vedde Ash to examine the marine C-14 reservoir age. This change d from its modem North Atlantic value of ca. 400 yr to ca. 700 yr duri ng the Younger Dryas climatic event. The increased marine reservoir ag e has implications for both comparing climatic time series dated by C- 14 and understanding palaeoceanographic changes that generated the inc rease.