Iceberg discharges into the North Atlantic on millennial time scales during the last glaciation
- Columbia Univ., Palisades, NY (United States)
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 difference 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. 32 refs., 5 figs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 70321
- Journal Information:
- Science, Journal Name: Science Journal Issue: 5200 Vol. 267; ISSN SCIEAS; ISSN 0036-8075
- Country of Publication:
- United States
- Language:
- English
Similar Records
The hierarchical structure of glacial climatic oscillations: Interactions between ice-sheet dynamics and climate
Laurentide Ice Sheet meltwater and abrupt climate change during the last glaciation
Journal Article
·
Fri Mar 31 23:00:00 EST 1995
· Climate Dynamics
·
OSTI ID:285030
Laurentide Ice Sheet meltwater and abrupt climate change during the last glaciation
Journal Article
·
Sun Oct 02 00:00:00 EDT 2005
· Paleoceanography, vol. 21, N/A, March 3, 2006, doi:10.1029/2005PA001186
·
OSTI ID:898043