Deglacial Meltwater Pulse 1B and Younger Dryas Sea Levels Revisited with Boreholes at Tahiti

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Science  14 Jan 2010:
DOI: 10.1126/science.1180557


Reconstructing sea-level changes during the last deglaciation provides a way of understanding the ice dynamics that can perturb large continental ice sheets. The resolution of the few sea-level records covering the critical time interval between 14 and 9 thousand calendar years before the present (cal kyr B.P.) is still insufficient to draw conclusions about sea-level changes associated with the Younger Dryas (YD) cold event and the meltwater pulse 1B (MWP-1B). Here, we use the U-Th method to date shallow-living corals from three new cores drilled onshore in the Tahiti barrier reef. No significant discontinuity can be detected in the sea-level rise during the MWP-1B period. The new Tahiti sea-level record shows that the sea-level rise slowed down during the YD before accelerating again during the Holocene.