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Science 4 July 1997:
Vol. 277. no. 5322, pp. 74 - 78
DOI: 10.1126/science.277.5322.74
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Reports

Mid- to Late Pleistocene Ice Drift in the Western Arctic Ocean: Evidence for a Different Circulation in the Past

Jens F. Bischof, Dennis A. Darby

The provenance of ice-rafted debris (IRD) in four Arctic sediment cores implies that icebergs from the northwestern Laurentide ice sheets drifted across the western Arctic Ocean along the 180°-0° meridian toward Fram Strait during mid- to late Pleistocene deglaciations within the last 700,000 years. This iceberg drift was different from the present-day Beaufort Gyre circulation and resembled a dislocated transpolar drift (TPD). Sea ice mainly followed the iceberg trajectories but also frequently drifted from the Russian shelves eastward into the Amerasian Basin.

Applied Marine Research Laboratory, Department of Oceanography, Old Dominion University, 1034 West 45th Street, Norfolk, VA 23529, USA. E-mail: jfb100r{at}oduvm.cc.odu.edu (J.F.B.), dad100f{at}oduvm.cc.odu.edu (D.A.D.).

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