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Science 17 February 1995:
Vol. 267. no. 5200, pp. 1005 - 1010
DOI: 10.1126/science.267.5200.1005
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Articles

Iceberg Discharges into the North Atlantic on Millennial Time Scales During the Last Glaciation

Gerard C. Bond 1 and Rusty Lotti 1

1 Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA.

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.

Submitted on October 17, 1994
Accepted on December 28, 1994


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