North Atlantic Ice-Rafting: A Major Change at 75,000 Years Before the Present
During the last interglacial-to-glacial climatic cycle [127,000 to 10,000 years before the present (B.P.)], the fundamental geographic shift in the main axis of ice-rafting deposition occurred at 75,000 years B.P. An earlier meridional depositional maximum along the Greenland-Newfoundland coasts was...
| Published in: | Science |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | English |
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American Association for the Advancement of Science (AAAS)
1977
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1126/science.196.4295.1208 https://www.science.org/doi/pdf/10.1126/science.196.4295.1208 |
| Summary: | During the last interglacial-to-glacial climatic cycle [127,000 to 10,000 years before the present (B.P.)], the fundamental geographic shift in the main axis of ice-rafting deposition occurred at 75,000 years B.P. An earlier meridional depositional maximum along the Greenland-Newfoundland coasts was superseded by a nearly zonal and much stronger axis some 1500 kilometers to the south along 40°N to 50°N. Both depositional patterns are best explained by cyclonic flow in the subpolar gyre, with the depositional shift related to the retreat of warm, ice-melting North Atlantic drift water from the northwestern half of the gyre. Similar shifts must have characterized preceding interglacial-glacial cycles. |
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