Iceberg Discharges into the North Atlantic on Millennial Time Scales During the Last Glaciation
High-resolution studies of North Atlantic deep sea cores demonstrate that prominent increases in iceberg calving recurred at intervals of 2000 to 3000 years, much more frequently than the 7000- to 10,000-year pacing of massive ice discharges associated with Heinrich events. The calving cycles correl...
Published in: | Science |
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Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Association for the Advancement of Science (AAAS)
1995
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Subjects: | |
Online Access: | http://dx.doi.org/10.1126/science.267.5200.1005 https://www.science.org/doi/pdf/10.1126/science.267.5200.1005 |
Summary: | High-resolution studies of North Atlantic deep sea cores demonstrate that prominent increases in iceberg calving recurred at intervals of 2000 to 3000 years, much more frequently than the 7000- to 10,000-year pacing of massive ice discharges associated with Heinrich events. The calving cycles correlate with warm-cold oscillations, called Dansgaard-Oeschger events, in Greenland ice cores. Each cycle records synchronous discharges of ice from different sources, and the cycles are decoupled from sea-surface temperatures. These findings point to a mechanism operating within the atmosphere that caused rapid oscillations in air temperatures above Greenland and in calving from more than one ice sheet. |
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