Ventilation of the North Atlantic Ocean during the Last Glacial Maximum: A comparison between simulated and observed radiocarbon ages
Article first published online: 8 APR 2003
Copyright 2003 by the American Geophysical Union.
Volume 18, Issue 2, June 2003
How to Cite
2003), Ventilation of the North Atlantic Ocean during the Last Glacial Maximum: A comparison between simulated and observed radiocarbon ages, Paleoceanography, 18, 1023, doi:10.1029/2002PA000762, 2., , , and (
- Issue published online: 8 APR 2003
- Article first published online: 8 APR 2003
- Manuscript Accepted: 22 OCT 2002
- Manuscript Revised: 27 SEP 2002
- Manuscript Received: 28 JAN 2002
- Last Glacial Maximum;
- thermohaline circulation;
- climate modeling
 The distribution of radiocarbon during simulations of the Last Glacial Maximum with a coupled ocean-atmosphere-sea ice model is compared with sediment core measurements from the equatorial Atlantic Ceara Rise, Blake Ridge, Caribbean Sea, and South China Sea. During these simulations we introduce a perturbation of North Atlantic freshwater fluxes leading to varying strengths of the Atlantic meridional overturning. The best fit with the observations is obtained for an overturning weakened by 40% compared with today. Further, we simulate the phenomenon of an “age reversal” found in deep sea corals, but we suggest that this indicates rather a sudden interruption of deep water formation instead of an increase in ventilation, which was suggested earlier.