2003 Seattle Annual Meeting (November 25, 2003)
Paper No. 132-1
Presentation Time: 8:00 AM-8:20 AM

IS THE YOUNGER DRYAS GLOBAL IN EXTENT?

RUTTER, Nathaniel W., Earth & Atmospheric Sciences, Univ of Alberta, Edmonton, AB T6G 2E3, Nat.Rutter@ualberta.ca and WEAVER, Andrew J., School of Earth and Ocean Sciences, Univ of Victoria, PO Box 3055 STN CSC, Victoria, BC V8W 3P6

Evidence for the Younger Dryas cooling event (~10,500 - 13,000 calendar years ago) is found in a variety of climatic proxies, such as variations in pollen records, composition of ice cores, grain size in loess deposits, chemistry of ocean sediments, and the presence of glacial moraines. Here, we evaluate worldwide evidence, chronological control and duration of the Younger Dryas and compare these results to climate models. The Younger Dryas is well established in the North Atlantic region becoming more problematic in both evidence and chronological control in other areas of the world. In addition, ocean records reveal conflicting evidence for Younger Dryas forcing mechanisms and the timing of events. Further the Younger Dryas may be mistaken for other short term cold intervals such as the 8.2 ka event, when dating control is weak. Nevertheless, the Younger Dryas appears to be global in scale, albeit the signals vary in strength. We compare the proxy records to the ocean general circulation model coupled to the energy and moisture balance atmospheric model. We find the model results compare favourably with the temperature change interrupted from palaeoclimatic reconstruction and the general duration of the cooling of the Younger Dryas.

2003 Seattle Annual Meeting (November 25, 2003)
Session No. 132
Global Climate Changes: Abrupt Late Pleistocene Climatic Reversals and Modern Global Warming
Washington State Convention and Trade Center: Ballroom 6B
8:00 AM-12:00 PM, Tuesday, November 4, 2003

Geological Society of America Abstracts with Programs, Vol. 35, No. 6, September 2003, p. 349

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