Abrupt climate shifts in Greenland due to displacements of the sea ice edge
Article first published online: 1 OCT 2005
Copyright 2005 by the American Geophysical Union.
Geophysical Research Letters
Volume 32, Issue 19, October 2005
How to Cite
2005), Abrupt climate shifts in Greenland due to displacements of the sea ice edge, Geophys. Res. Lett., 32, L19702, doi:10.1029/2005GL023492., , , and (
- Issue published online: 1 OCT 2005
- Article first published online: 1 OCT 2005
- Manuscript Accepted: 31 AUG 2005
- Manuscript Revised: 22 JUL 2005
- Manuscript Received: 29 MAY 2005
 An atmospheric circulation model is used to show that a reduction in sea ice extent in the North Atlantic produces a climatic response consistent with abrupt changes in temperature and snow accumulation recorded in Greenland during the Dansgaard-Oeschger (D-O) events of the last glacial period. The model simulations exhibit warming that is especially pronounced in winter and an accumulation increase that occurs primarily in summer, though the fractional accumulation increase is greater in winter. The seasonality of the combined temperature and accumulation changes is also consistent with the oxygen isotope signal, explaining why estimates of the magnitude of D-O warming from oxygen isotopes are damped relative to direct estimates. Mechanisms for driving such displacements of sea ice could be changes in ocean thermohaline circulation (OTC) or rearrangements of the tropical atmosphere-ocean system.