HR: 10:50h
AN: PP41D-03 INVITED     [PDF]
TI: Abrupt Change 8200 Years Ago: The Smoking Gun?
AU: * Alley, R B
EM: ralley@essc.psu.edu
AF: Department of Geosciences and EMS Environment Institute, Pennsylvania State University, Deike Building, University Park, PA 16802 United States
AB: The large, rapid, widespread climate change about 8200 years ago followed a large freshening of the North Atlantic Ocean, and produced climate anomalies in the Northern Hemisphere that are consistent with the expected response to North Atlantic cooling and that mimic the larger and longer-lasting effects of the Younger Dryas and older events. The short-lived nature of this Holocene event explains the lack of a signal at high southern latitudes, and the other features support the hypotheses that abrupt climate changes have been forced by North Atlantic freshening, and that Holocene warmth is not a guarantee of stability. Comparison of modeled and observed impacts of North Atlantic freshening suggests that some models are somewhat undersensitive compared to the real world.
DE: 1600 GLOBAL CHANGE (New category)
DE: 1827 Glaciology (1863)
DE: 3344 Paleoclimatology
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2003 Fall Meeting