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Ventilation of the North Atlantic Ocean during the Last Glacial Maximum: A comparison between
 

Summary: Ventilation of the North Atlantic Ocean during the
Last Glacial Maximum: A comparison between
simulated and observed radiocarbon ages
K. J. Meissner, A. Schmittner, and A. J. Weaver
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada
J. F. Adkins
Geological and Planetary Sciences, California Institute of Technology, Pasadena, California, USA
Received 28 January 2002; revised 27 September 2002; accepted 22 October 2002; published 8 April 2003.
[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. INDEX TERMS: 4860 Oceanography: Biological and Chemical: Radioactivity and radioisotopes; 4255 Oceanography:
General: Numerical modeling; 4532 Oceanography: Physical: General circulation; 4267 Oceanography: General: Paleoceanography;
KEYWORDS: Last Glacial Maximum, thermohaline circulation, radiocarbon, climate modeling
Citation: Meissner, K. J., A. Schmittner, A. J. Weaver, and J. F. Adkins, Ventilation of the North Atlantic Ocean during the Last
Glacial Maximum: A comparison between simulated and observed radiocarbon ages, Paleoceanography, 18(2), 1023,

  

Source: Adkins, Jess F. - Division of Geological and Planetary Sciences, California Institute of Technology
Schmittner, Andreas - College of Oceanic and Atmospheric Sciences, Oregon State University

 

Collections: Environmental Sciences and Ecology; Geosciences