Abrupt climatic events during the last glacial-interglacial transition in Alaska

Evidence is mounting that abrupt climatic shifts occurred during the last glacial- interglacial transition ( LGIT) in the North Atlantic and other regions. However, few high- resolution climatic records of the LGIT exist from the high latitudes of the North Pacific rim. We analyzed lake sediments from southwestern Alaska for biogenic silica, organic carbon, organic nitrogen, diatom assemblages, and compound- specific hydrogen isotopes. Results reveal climatic changes coincident with the Younger Dryas, Intra-Allerod Cold Period, and Pre- Boreal Oscillation. However, major discrepancies exist in the paleoclimate patterns of the Bolling- Allerod interstadial between our data and the GISP2 delta O-18 record from Greenland, and causes are uncertain. These data suggest that the North Pacific and North Atlantic experienced similar reversals during climatic warming of the LGIT but that the Bolling- Allerod cooling trend in the GISP2 delta O-18 record is probably not a hemispheric or global pattern.