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1 Institute of Geology, Tallinn University of Technology, Estonia pst. 7, 10143 Tallinn, Estonia
2 Department of Geology, University of Helsinki, P.O. Box 64, FIN-00014, Helsinki, Finland
3 Geological Survey of Finland, P.O. Box 96, FIN-02150, Espoo, Finland
A quantitative annual mean temperature reconstruction from an annually laminated lake-sediment sequence in Estonia, eastern Europe, shows a distinct cold period at 8400– 8080 yr B.P. (= before A.D. 2000); the timing is consistent with that seen in the Greenland ice-core data and various high-resolution records from western Europe. During maximal cooling at 8250–8150 yr B.P., the annual mean temperature in Estonia was 
2.0 °C colder than prior to and 3.0 °C colder than after the cooling. The pollen-stratigraphic and sedimentological data suggest especially cold and snowy winter conditions. The duration and amplitude of the cold event agree with the modeled impact of a sudden freshening of the North Atlantic surface water and subsequent perturbation of the thermohaline circulation. Provided that the cold event was caused by a pulse of freshwater—from the melting Laurentide Ice Sheet—to the North Atlantic, the results indicate a strong teleconnection between the North Atlantic oceanic forcing and the east European climate at least up to long 26°E, mediated probably by the changing intensity of the zonal atmospheric circulation.
Key Words: varve chronology • pollen • oxygen isotopes • 8200 yr B.P. cold event • thermohaline circulation • Estonia
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