Ventilation of the North Atlantic Ocean during the Last Glacial Maximum: A comparison between simulated and observed radiocarbon ages

TitleVentilation of the North Atlantic Ocean during the Last Glacial Maximum: A comparison between simulated and observed radiocarbon ages
Publication TypeJournal Article
Year of Publication2003
AuthorsMeissner, K. J., A. Schmittner, A. J. Weaver, and J. F. Adkins
JournalPaleoceanography
Volume18
Pagination1023
Date PublishedApr 8
ISBN Number0883-8305
Accession NumberISI:000182356500001
Keywordsatmospheric radiocarbon, calibration, climate modeling, coupled climate model, deep-water, distributions, last glacial maximum, radiocarbon, rapid changes, thermohaline circulation
Abstract

[1] 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.

URL<u><Go to ISI>://000182356500001</u>