HR: 15:10h
AN: PP13B-07 INVITED     [Abstracts]
TI: Reanalysis and Extension of the Barbados Sea Level Record
AU: * Fairbanks, R G
EM: fairbanks@LDEO.columbia.edu
AF: Columbia University Lamont-Doherty Earth Observatory, 61 Rt. 9W, Palisades, NY 10964 United States
AU: Peltier, W R
EM: peltier@atmosp.physics.utoronto.ca
AF: University of Toronto Department of Physics, 60 St. George Street, Toronto, M5S 1A7 Canada
AB: The development and application of advanced multi-collector inductively coupled magnetic sector mass spectrometry and improvements in accelerator mass spectrometers warrant a reanalysis of the Barbados sea level curve (Fairbanks, 1989) at higher analytical precision and in more detail. Several hundred new 230Th/234U and radiocarbon dates and the addition of more Barbados offshore cores results in an extended and more detailed sea level record and oxygen isotope record for this important location. Among our new observations, the more detailed Barbados sea level record now resolves a Younger Dryas still stand and curiously indicates that the LGM may have occurred as early as 26,000 years ago. The Isotope Stage 3 interstadial ended with sea level near 87.5 meters below present at 29,500 years ago before dropping to full glacial levels. We incorporate these new sea level data into a refined model of continental deglaciation and an accurate methodology for prediction of the changes of sea-level that accompany changes of land ice volume. Our results not only provide unambiguous evidence that the post LGM rise of eustatic sea-level was very close to the widely supported estimate of 120 m, thus ruling out the occurrence of any significant meltwater pulse at 19 ka, but also that the system remained near the fully glaciated state for almost 8,000 years.
DE: 3344 Paleoclimatology
DE: 4267 Paleoceanography
DE: 4556 Sea level variations
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting