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Science 9 July 1993:
Vol. 261. no. 5118, pp. 198 - 200
DOI: 10.1126/science.261.5118.198
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Articles

A 50,000-Year Record of Climate Oscillations from Florida and Its Temporal Correlation with the Heinrich Events

Eric C. Grimm 1, George L. Jacobson Jr. 2, William A. Watts 3, Barbara C. S. Hansen 4, and Kirk A. Maasch 5

1 Illinois State Museum, Research and Collections Center, 1920 South 10frac12 Street, Spring-field, IL 62703
2 Department of Plant Biology and Institute for Quaternary Studies, University of Maine, Orono, ME 04469
3 Department of Botany, Trinity College, Dublin 2, Ireland
4 Limnological Research Center, University of Minnesota, Minneapolis, MN 55455
5 Department of Geological Sciences and Institute for Quaternary Studies, University of Maine, Orono, ME 04469

Oscillations of Pinus (pine) pollen in a 50,000-year sequence from Lake Tulane, Florida, indicate that there were major vegetation shifts during the last glacial cycle. Episodes of abundant Pinus populations indicate a climate that was more wet than intervening phases dominated by Quercus (oak) and Ambrosia-type (ragweed and marsh-elder). The Pinus episodes seem to be temporally correlated with the North Atlantic Heinrich events, which were massive, periodic advances of ice streams from the eastern margin of the Laurentide Ice Sheet. Possible links between the Tulane Pinus and Heinrich events include hemispheric cooling, the influences of Mississippi meltwater on sea-surface temperatures in the Gulf of Mexico, and the effects of North Atlantic thermohaline circulation on currents in the Gulf.

Submitted on March 10, 1993
Accepted on May 3, 1993


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