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Anomalously mild Younger Dryas summer conditions in southern Greenland

¹ Department of Geology, Quaternary Geology, Lund University, Tornavagen 13, SE-223 63 Lund, Sweden
² Geological Survey of Denmark and Greenland, Thoravej 8, DK-2400 Copenhagen, Denmark
³ Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden
⁴ Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
⁵ Department of Quaternary Geology and Geomorphology, Vrije University, De Boelelaan 1085, 1081 HV Amsterdam, Netherlands
⁶ Danish Meteorological Institute, Lyngbyvej 100, DK-2100 Copenhagen, Denmark
⁷ Department of Marine Ecology, Danish National Environmental Research Institute (DMU), P.O. Box 358, DK- 4000 Roskilde, Denmark

The first late-glacial lake sediments found in Greenland were analyzed with respect to a variety of environmental variables. The analyzed sequence covers the time span between 14 400 and 10 500 calendar yr B.P., and the data imply that the conditions in southernmost Greenland during the Younger Dryas stadial, 12 800–11 550 calendar yr B.P., were characterized by an arid climate with cold winters and mild summers, preceded by humid conditions with cooler summers. Climate models imply that such an anomaly may be explained by local climatic phenomenon caused by high insolation and Föhn effects. It shows that regional and local variations of Younger Dryas summer conditions in the North Atlantic region may have been larger than previously found from proxy data and modeling experiments.

Key Words: Southern Greenland • lake sediments • paleoclimatic proxy records • Younger Dryas

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